Merge pull request #23 from dalbodeule/feature/yamux

feat: add HTTP/3 ingress and update tunnel architecture

.env.example

@@ -41,8 +41,8 @@ HOP_SERVER_HTTP_LISTEN=:8080
 # HTTPS 리스닝 포트 (보통 :443)
 HOP_SERVER_HTTPS_LISTEN=:8443
 
-# DTLS 리스닝 포트 (보통 :443, 필요시 별도 포트 사용)
+# TLS + yamux 클라이언트 터널 포트
-HOP_SERVER_DTLS_LISTEN=:8443
+HOP_SERVER_TUNNEL_LISTEN=:7443
 
 # 메인 도메인 (예: example.com)
 HOP_SERVER_DOMAIN=example.com
@@ -102,9 +102,9 @@ HOP_DB_DSN=postgres://user:pass@localhost:5432/hopgate?sslmode=disable
 
 # ---- Client settings ----
 
-# DTLS 서버 주소 (host:port)
+# yamux 터널 서버 주소 (host:port)
-# 예: example.com:443
+# 예: example.com:7443
-HOP_CLIENT_SERVER_ADDR=localhost:8443
+HOP_CLIENT_SERVER_ADDR=localhost:7443
 
 # 클라이언트 도메인
 HOP_CLIENT_DOMAIN=test.example.com

API.md

@@ -1,485 +1,58 @@
-# HopGate API Reference / HopGate API 명세
+# HopGate API
 
-This document describes the externally visible APIs currently implemented in HopGate, with English as the primary language and Korean descriptions in parallel.  
+## Public Ingress
-이 문서는 현재 HopGate에 구현된 외부 공개 API를 정리한 것으로, 영어를 기본으로 하며 한국어 설명을 병기합니다.
 
----
+Registered domains are served by the public listeners configured on the server.
+The same request is forwarded to the client's `HOP_CLIENT_LOCAL_TARGET`.
 
-## 1. Admin Plane HTTP API / 관리 Plane HTTP API
+| Protocol | Port | Supported behavior |
+| --- | --- | --- |
+| HTTP/1.1 | TCP `HOP_SERVER_HTTP_LISTEN` / `HOP_SERVER_HTTPS_LISTEN` | HTTP, SSE, WebSocket Upgrade |
+| HTTP/2 | TCP `HOP_SERVER_HTTPS_LISTEN` | HTTP, SSE, WebSocket Extended CONNECT |
+| HTTP/3 | UDP `HOP_SERVER_HTTPS_LISTEN` | HTTP, SSE, WebSocket Extended CONNECT |
 
-The admin plane is exposed under the HTTPS endpoint of the HopGate server.  
+HTTP/3 is announced to HTTP/1.1 and HTTP/2 clients with `Alt-Svc`. HTTP/2
-관리 Plane은 HopGate 서버의 HTTPS 엔드포인트 아래에서 동작합니다.
+Extended CONNECT requires `GODEBUG=http2xconnect=1` when starting the server.
 
-- Base URL: `https://{HOP_SERVER_DOMAIN}/api/v1/admin`  
+### SSE
-  기본 URL: `https://{HOP_SERVER_DOMAIN}/api/v1/admin`
-- Implementation: [`internal/admin/http.go`](internal/admin/http.go)  
-  구현 위치: [`internal/admin/http.go`](internal/admin/http.go)
-- Wired into server main: [`cmd/server/main.go`](cmd/server/main.go)  
-  서버 메인에서의 연결: [`cmd/server/main.go`](cmd/server/main.go)
 
-### 1.1 Authentication / 인증
+SSE is detected when the request `Accept` header contains `text/event-stream`.
+The response is streamed without buffering and bypasses the normal proxy
+timeout. The upstream should send standard SSE records separated by a blank
+line, for example:
 
-- Header: `Authorization: Bearer {HOP_ADMIN_API_KEY}`  
+```text
-  헤더: `Authorization: Bearer {HOP_ADMIN_API_KEY}`
+data: hello
-- Env var: `HOP_ADMIN_API_KEY`  
-  환경 변수: `HOP_ADMIN_API_KEY`
-- If the key is missing or incorrect, the API responds with `401 Unauthorized`.  
-  키가 없거나 값이 올바르지 않으면 `401 Unauthorized` 로 응답합니다.
 
-### 1.2 Domain Register API / 도메인 등록 API
-
-- Method: `POST`  
-  메서드: `POST`
-- Path: `/api/v1/admin/domains/register`  
-  경로: `/api/v1/admin/domains/register`
-- Purpose: Register a new domain and issue a 64-character client API key bound to that domain.  
-  목적: 새로운 도메인을 등록하고 해당 도메인에 매핑된 64자 클라이언트 API 키를 발급합니다.
-
-#### 1.2.1 Request / 요청
-
-- Content-Type: `application/json`
-- Body:
-
-```json
-{
-  "domain": "app.example.com",
-  "memo": "my staging app"
-}
 ```
 
-- Fields  
+### WebSocket
-  필드
 
-- `domain` (string, required)  
+HTTP/1.1 WebSocket uses `Upgrade: websocket`. HTTP/2 and HTTP/3 use Extended
-  - FQDN, must contain at least one dot, case-insensitive.  
+CONNECT with `:protocol=websocket`. The local service may remain an ordinary
-  - 공백이 없어야 하며, 최소 한 개 이상의 점(`.`)을 포함하는 FQDN이어야 합니다.
+HTTP/1.1 WebSocket server; HopGate translates the Extended CONNECT handshake
-- `memo` (string, optional)  
+before relaying the raw bidirectional payload.
-  - Free-form memo for administrators; may be empty.  
-  - 관리자를 위한 자유 형식 메모로, 비어 있어도 됩니다.
 
-#### 1.2.2 Successful Response / 성공 응답
+## Admin API
 
-- Status: `200 OK`
+Admin endpoints are served under `/api/v1/admin/` on `HOP_SERVER_DOMAIN` and
-- Body:
+require `Authorization: Bearer $HOP_ADMIN_API_KEY`.
 
-```json
+- `POST /api/v1/admin/domains/register`
-{
+  - Request: `{"domain":"app.example.com","memo":"optional"}`
-  "success": true,
+  - Response includes the generated `client_api_key`.
-  "client_api_key": "abcd1234...wxyz5678"
+- `POST /api/v1/admin/domains/unregister`
-}
+  - Request: `{"domain":"app.example.com","client_api_key":"..."}`
-```
 
-- Fields  
+## Tunnel Configuration
-  필드
 
-- `success` (boolean) — always `true` on success.  
+The server listens for client tunnels on `HOP_SERVER_TUNNEL_LISTEN`, defaulting
-  `success` (boolean) — 성공 시 항상 `true` 입니다.
+to `:7443`. The client connects to that address with
-- `client_api_key` (string, length 64) — client API key bound to the registered domain.  
+`HOP_CLIENT_SERVER_ADDR`. The client only needs an outbound TCP connection.
-  `client_api_key` (string, 길이 64) — 등록된 도메인에 매핑된 클라이언트 API 키입니다.
 
-#### 1.2.3 Error Responses / 에러 응답
+Required client settings are `HOP_CLIENT_SERVER_ADDR`, `HOP_CLIENT_DOMAIN`,
+`HOP_CLIENT_API_KEY`, `HOP_CLIENT_LOCAL_TARGET`, and `HOP_CLIENT_DEBUG`.
 
-- `400 Bad Request`
+The tunnel is TLS over TCP with yamux multiplexing. The client only needs an
-  - Invalid JSON body or missing/empty `domain`.  
+outbound TCP connection to the tunnel listener; public HTTP/3 traffic terminates
-  - JSON 바디가 잘못되었거나 `domain` 이 비어 있는 경우.
+at the server and does not require QUIC support in the client.
-  - Body:
-
-```json
-{
-  "success": false,
-  "error": "invalid request body"
-}
-```
-
-  or
-
-```json
-{
-  "success": false,
-  "error": "domain is required"
-}
-```
-
-- `401 Unauthorized`
-  - Missing or invalid `Authorization` header.  
-  - `Authorization` 헤더가 없거나 잘못된 경우.
-  - Body:
-
-```json
-{
-  "success": false,
-  "error": "unauthorized"
-}
-```
-
-- `500 Internal Server Error`
-  - Database or internal logic error while registering domain.  
-  - 도메인 등록 처리 중 데이터베이스 또는 내부 로직 에러가 발생한 경우.
-  - Body:
-
-```json
-{
-  "success": false,
-  "error": "internal error"
-}
-```
-
-### 1.3 Domain Unregister API / 도메인 해제 API
-
-- Method: `POST`  
-  메서드: `POST`
-- Path: `/api/v1/admin/domains/unregister`  
-  경로: `/api/v1/admin/domains/unregister`
-- Purpose: Unregister a domain using the `(domain, client_api_key)` pair.  
-  목적: `(domain, client_api_key)` 조합을 사용해 도메인 등록을 해제합니다.
-
-#### 1.3.1 Request / 요청
-
-- Content-Type: `application/json`
-- Body:
-
-```json
-{
-  "domain": "app.example.com",
-  "client_api_key": "abcd1234...wxyz5678"
-}
-```
-
-- Fields  
-  필드
-
-- `domain` (string, required)  
-  - Same normalization rule as the register API (lowercased, trimmed, FQDN-like).  
-  - 등록 API와 동일한 정규화 규칙(소문자, 공백 제거, FQDN 형태)을 따릅니다.
-- `client_api_key` (string, required)  
-  - Exact client API key previously issued for the domain.  
-  - 해당 도메인에 대해 이전에 발급된 클라이언트 API 키와 정확히 일치해야 합니다.
-
-#### 1.3.2 Successful Response / 성공 응답
-
-- Status: `200 OK`
-- Body:
-
-```json
-{
-  "success": true
-}
-```
-
-- `success` (boolean) — `true` if the domain was found and deleted.  
-  `success` (boolean) — 해당 도메인이 존재했고 삭제되었을 때 `true` 입니다.
-
-#### 1.3.3 Error Responses / 에러 응답
-
-- `400 Bad Request`
-  - Invalid JSON body, or `domain` or `client_api_key` is missing/empty.  
-  - JSON 바디가 잘못되었거나 `domain` 혹은 `client_api_key` 가 비어 있는 경우.
-  - Body:
-
-```json
-{
-  "success": false,
-  "error": "invalid request body"
-}
-```
-
-  or
-
-```json
-{
-  "success": false,
-  "error": "domain and client_api_key are required"
-}
-```
-
-- `401 Unauthorized`
-  - Missing or invalid `Authorization` header.  
-  - `Authorization` 헤더가 없거나 잘못된 경우.
-  - Same JSON structure as in the register API.  
-  - JSON 응답 구조는 등록 API와 동일합니다.
-
-- `500 Internal Server Error`
-  - Internal error while unregistering or deleting the domain.  
-  - 도메인 해제/삭제 처리 중 내부 에러가 발생한 경우.
-  - Body:
-
-```json
-{
-  "success": false,
-  "error": "internal error"
-}
-```
-
----
-
-## 2. Public HTTPS Reverse Proxy Entry / 공개 HTTPS 프록시 엔트리
-
-HopGate acts as an HTTPS reverse proxy, forwarding incoming HTTP(S) requests for registered domains over DTLS to connected clients.  
-HopGate는 등록된 도메인에 대한 HTTP(S) 요청을 DTLS를 통해 클라이언트로 전달하는 HTTPS 리버스 프록시 역할을 합니다.
-
-- Entry points:  
-  진입점:
-  - `http://{HOP_SERVER_DOMAIN}/...`  
-  - `https://{HOP_SERVER_DOMAIN}/...`
-- Implementation: [`cmd/server/main.go`](cmd/server/main.go)  
-  구현 위치: [`cmd/server/main.go`](cmd/server/main.go)
-
-Behavior summary:  
-동작 요약:
-
-- If the path starts with `/.well-known/acme-challenge/`, HopGate serves static ACME HTTP-01 challenge files from `HOP_ACME_WEBROOT`.  
-  경로가 `/.well-known/acme-challenge/` 로 시작하면 HopGate는 `HOP_ACME_WEBROOT` 디렉터리에서 ACME HTTP-01 챌린지 파일을 정적으로 서빙합니다.
-- For other paths, HopGate looks up an active DTLS session for the incoming `Host` and forwards the HTTP request over that session.  
-  그 외 경로에 대해서는 들어온 `Host` 에 해당하는 활성 DTLS 세션을 찾은 뒤, HTTP 요청을 해당 세션을 통해 포워딩합니다.
-- If no DTLS session is available for the host, the server responds with `502 Bad Gateway`.  
-  해당 호스트에 대한 DTLS 세션이 없으면 서버는 `502 Bad Gateway` 로 응답합니다.
-
-The reverse-proxy behavior is not a separate REST API but the core behavior of the HopGate server.  
-이 프록시 동작은 별도의 REST API라기보다는 HopGate 서버의 핵심 동작입니다.
-
----
-
-## 3. DTLS Handshake Protocol / DTLS 핸드셰이크 프로토콜
-
-The DTLS handshake between server and client uses a small JSON-based protocol to authenticate the `(domain, client_api_key)` pair before establishing the HTTP tunneling session.  
-서버와 클라이언트 사이의 DTLS 핸드셰이크는 HTTP 터널링 세션을 열기 전 `(domain, client_api_key)` 조합을 인증하기 위해 간단한 JSON 기반 프로토콜을 사용합니다.
-
-- Implementation: [`internal/dtls/handshake.go`](internal/dtls/handshake.go)  
-  구현 위치: [`internal/dtls/handshake.go`](internal/dtls/handshake.go)
-
-### 3.1 Handshake Request / 핸드셰이크 요청
-
-The client sends a JSON message over the DTLS session:  
-클라이언트는 DTLS 세션 위로 다음과 같은 JSON 메시지를 전송합니다.
-
-```json
-{
-  "domain": "app.example.com",
-  "client_api_key": "abcd1234...wxyz5678"
-}
-```
-
-- `domain` and `client_api_key` must match a registered domain entry for the handshake to succeed.  
-  핸드셰이크가 성공하려면 `domain` 과 `client_api_key` 가 등록된 도메인 정보와 일치해야 합니다.
-
-### 3.2 Handshake Response / 핸드셰이크 응답
-
-The server responds with:  
-서버는 다음과 같은 구조로 응답합니다.
-
-```json
-{
-  "ok": true,
-  "message": "handshake ok",
-  "domain": "app.example.com"
-}
-```
-
-- On failure, `ok` is `false` and `message` contains a human-readable reason (e.g., `"invalid domain or api key"`).  
-  실패 시 `ok` 는 `false` 이며, `message` 에 `"invalid domain or api key"` 와 같은 사람이 읽을 수 있는 이유가 담깁니다.
-
-A successful handshake registers the DTLS session for the given domain so that subsequent HTTPS requests for that domain can be tunneled through the session.  
-핸드셰이크가 성공하면 해당 도메인에 대해 DTLS 세션이 등록되어, 이후 그 도메인으로 들어오는 HTTPS 요청이 이 세션을 통해 터널링될 수 있습니다.
-
----
-
-## 4. Additional Admin Plane APIs / 추가 관리 Plane API
-
-This section describes two helper admin APIs for checking whether a domain is registered and retrieving its detailed status.  
-이 섹션은 도메인 등록 여부를 확인하고 상세 상태를 조회하기 위한 두 가지 관리용 API를 설명합니다.
-
-Implementation references / 구현 위치:
-
-- Admin HTTP handlers: [`internal/admin/http.go`](internal/admin/http.go:197)  
-- Domain service methods: [`internal/admin/service.go`](internal/admin/service.go:129)
-
-### 4.1 Check Domain Registration (exists) / 도메인 등록 여부 확인
-
-- Method / 메서드: `GET`
-- Path / 경로: `/api/v1/admin/domains/exists`
-- Authentication / 인증:
-  - Same as other admin APIs: `Authorization: Bearer {HOP_ADMIN_API_KEY}`  
-    다른 Admin API와 동일하게 `Authorization: Bearer {HOP_ADMIN_API_KEY}` 헤더 사용.
-- Purpose / 목적:
-  - Check if a given domain is already registered in the `Domain` table.  
-    특정 도메인이 `Domain` 테이블에 이미 등록되어 있는지 확인합니다.
-
-#### 4.1.1 Request / 요청
-
-- Query Parameters / 쿼리 파라미터:
-  - `domain` (string, required) — domain to check.  
-    `domain` (string, 필수) — 확인할 도메인.
-
-- Example / 예시:
-
-```http
-GET /api/v1/admin/domains/exists?domain=app.example.com HTTP/1.1
-Host: {HOP_SERVER_DOMAIN}
-Authorization: Bearer {HOP_ADMIN_API_KEY}
-```
-
-#### 4.1.2 Successful Response / 성공 응답
-
-- Status: `200 OK`
-- Body:
-
-```json
-{
-  "success": true,
-  "exists": true
-}
-```
-
-- Fields / 필드:
-  - `success` (bool) — request processed successfully.  
-    요청이 정상 처리되었는지 여부.
-  - `exists` (bool) — whether the domain is currently registered.  
-    도메인이 현재 등록되어 있는지 여부.
-
-If the domain is not registered:  
-도메인이 등록되어 있지 않으면:
-
-```json
-{
-  "success": true,
-  "exists": false
-}
-```
-
-#### 4.1.3 Error Responses / 에러 응답
-
-- `400 Bad Request`
-  - Missing or empty `domain` query parameter.  
-    `domain` 쿼리 파라미터가 없거나 비어 있는 경우.
-
-```json
-{
-  "success": false,
-  "error": "domain is required"
-}
-```
-
-- `401 Unauthorized`
-  - Missing or invalid `Authorization` header.  
-    `Authorization` 헤더가 없거나 잘못된 경우.
-
-```json
-{
-  "success": false,
-  "error": "unauthorized"
-}
-```
-
-- `500 Internal Server Error`
-  - Internal error while checking domain existence (e.g., DB error).  
-    도메인 존재 여부 확인 중 내부(DB 등) 에러가 발생한 경우.
-
-```json
-{
-  "success": false,
-  "error": "internal error"
-}
-```
-
----
-
-### 4.2 Domain Status API / 도메인 상태 조회 API
-
-- Method / 메서드: `GET`
-- Path / 경로: `/api/v1/admin/domains/status`
-- Authentication / 인증:
-  - `Authorization: Bearer {HOP_ADMIN_API_KEY}`
-- Purpose / 목적:
-  - Retrieve detailed information about a domain if registered, including memo and timestamps.  
-    도메인이 등록되어 있다면 메모, 생성/수정 시각 등 상세 정보를 조회합니다.
-
-#### 4.2.1 Request / 요청
-
-- Query Parameters / 쿼리 파라미터:
-  - `domain` (string, required) — domain to inspect.  
-    `domain` (string, 필수) — 조회할 도메인.
-
-- Example / 예시:
-
-```http
-GET /api/v1/admin/domains/status?domain=app.example.com HTTP/1.1
-Host: {HOP_SERVER_DOMAIN}
-Authorization: Bearer {HOP_ADMIN_API_KEY}
-```
-
-#### 4.2.2 Successful Response (exists) / 성공 응답 (도메인 존재 시)
-
-- Status: `200 OK`
-- Body:
-
-```json
-{
-  "success": true,
-  "exists": true,
-  "domain": "app.example.com",
-  "memo": "my staging app",
-  "created_at": "2025-01-01T12:34:56Z",
-  "updated_at": "2025-01-02T08:00:00Z"
-}
-```
-
-- Fields / 필드:
-  - `success` (bool) — request processed successfully.  
-    요청이 정상 처리되었는지 여부.
-  - `exists` (bool) — **true** if the domain record exists.  
-    도메인 레코드가 존재하면 `true`.
-  - `domain` (string) — normalized domain name.  
-    정규화된 도메인 이름.
-  - `memo` (string) — administrator memo.  
-    관리자 메모.
-  - `created_at` (string, RFC3339) — creation timestamp.  
-    생성 시각(RFC3339 문자열).
-  - `updated_at` (string, RFC3339) — last update timestamp.  
-    마지막 수정 시각(RFC3339 문자열).
-
-#### 4.2.3 Successful Response (not exists) / 성공 응답 (도메인 미존재 시)
-
-If the domain is not found in the database:  
-해당 도메인이 DB에 존재하지 않으면:
-
-```json
-{
-  "success": true,
-  "exists": false
-}
-```
-
-- No error; this is a normal “not registered” state.  
-  에러가 아니며, “등록되지 않음” 상태를 의미합니다.
-
-#### 4.2.4 Error Responses / 에러 응답
-
-- `400 Bad Request`
-  - Missing or empty `domain` query parameter.  
-
-```json
-{
-  "success": false,
-  "error": "domain is required"
-}
-```
-
-- `401 Unauthorized`
-  - Missing or invalid `Authorization` header.  
-
-```json
-{
-  "success": false,
-  "error": "unauthorized"
-}
-```
-
-- `500 Internal Server Error`
-  - Internal error while fetching domain status.  
-
-```json
-{
-  "success": false,
-  "error": "internal error"
-}
-```

ARCHITECTURE.md

@@ -1,239 +1,79 @@
-# HopGate Architecture / HopGate 아키텍처
+# HopGate Architecture
 
-이 문서는 HopGate 시스템의 전체 구조를 설명합니다. (ko)  
+HopGate exposes public HTTP traffic and forwards it to a private HTTP service
-This document describes the overall architecture of the HopGate system. (en)
+through one outbound TLS connection per client.
-
----
-
-## 1. Overview / 전체 개요
-
-- HopGate는 공인 서버와 여러 프라이빗 네트워크 클라이언트 사이에서 HTTP(S) 트래픽을 터널링하는 게이트웨이입니다. (ko)
-- HopGate is a gateway that tunnels HTTP(S) traffic between a public server and multiple private-network clients. (en)
-
-- 서버는 80/443 포트를 점유하고, ACME(Let's Encrypt 등)로 TLS 인증서를 자동 발급/갱신합니다. (ko)
-- The server listens on ports 80/443 and automatically issues/renews TLS certificates using ACME (e.g. Let's Encrypt). (en)
-
-- 전송 계층은 **TCP + TLS(HTTPS) + HTTP/2 + gRPC** 기반의 터널을 사용해 서버–클라이언트 간 HTTP 요청/응답을 멀티플렉싱합니다. (ko)
-- The transport layer uses a **TCP + TLS (HTTPS) + HTTP/2 + gRPC**-based tunnel to multiplex HTTP requests/responses between server and clients. (en)
-
-- 클라이언트는 장기 유지 gRPC bi-directional stream 을 통해 서버와 터널을 형성하고,
-  서버가 전달한 HTTP 요청을 로컬 서비스(127.0.0.1:PORT)에 대신 보내고 응답을 다시 서버로 전달합니다. (ko)
-- Clients establish long-lived gRPC bi-directional streams as tunnels to the server,
-  forward HTTP requests to local services (127.0.0.1:PORT), and send responses back to the server. (en)
-
-- 관리 Plane(REST API)을 통해 도메인 등록/해제 및 클라이언트 API Key 발급을 수행합니다. (ko)
-- An admin plane (REST API) is used to register/unregister domains and issue client API keys. (en)
-
----
-
-## 2. Directory Layout / 디렉터리 레이아웃
 
 ```text
-.
+                    TCP :80/:443  HTTP/1.1, HTTP/2
-├── cmd/
+public clients  ------------------------------->  HopGate server
-│   ├── server/              # server binary entrypoint
+                    UDP :443     HTTP/3              |
-│   └── client/              # client binary entrypoint
+                                                     | TLS/TCP
-├── internal/
+                                                     v
-│   ├── config/              # shared configuration loader
+                                      yamux logical streams
-│   ├── acme/                # ACME certificate management
+                                                     |
-│   ├── proxy/               # HTTP proxy / tunneling core (gRPC tunnel)
+                                                     v
-│   ├── protocol/            # server-client message protocol
+                                           HopGate client
-│   ├── admin/               # admin plane HTTP handlers
+                                                     |
-│   └── logging/             # structured logging utilities
+                                                     v
-├── ent/
+                                             localhost HTTP
-│   └── schema/              # ent schema definitions (e.g. Domain)
-└── pkg/
-    └── util/                # reusable helpers (optional)
 ```
 
----
+## Connection Model
 
-### 2.1 `cmd/`
+The client opens one TLS connection to the server and the connection is
+multiplexed by yamux. The first logical stream is a bounded JSON control stream
+containing the registered domain, local target, and client API key. The server
+authenticates this stream before registering the session for the domain.
 
-- [`cmd/server/main.go`](cmd/server/main.go) — 서버 실행 엔트리 포인트. 서버 설정 로딩, ACME/TLS 초기화, HTTP/HTTPS 리스너 및 gRPC 터널 엔드포인트 시작을 담당합니다. (ko)
+Each public request creates one bidirectional yamux stream. Every stream starts
-- [`cmd/server/main.go`](cmd/server/main.go) — Server entrypoint. Loads configuration, initializes ACME/TLS, and starts HTTP/HTTPS listeners plus the gRPC tunnel endpoint. (en)
+with a bounded JSON `StreamMeta` record and then carries HTTP/1.1 wire data.
+The stream kinds currently used are:
 
-- [`cmd/client/main.go`](cmd/client/main.go) — 클라이언트 실행 엔트리 포인트. 설정 로딩, gRPC/HTTP2 터널 연결, 로컬 서비스 프록시 루프를 담당합니다. (ko)
+- `control`: client registration and authentication metadata.
-- [`cmd/client/main.go`](cmd/client/main.go) — Client entrypoint. Loads configuration, establishes a gRPC/HTTP2 tunnel to the server, and runs the local proxy loop. (en)
+- `http`: ordinary HTTP requests and responses.
+- `websocket`: HTTP/1.1 Upgrade and HTTP/2/HTTP/3 Extended CONNECT traffic.
 
----
+Request and response bodies are copied between stream endpoints instead of
+being accumulated in memory. Long-lived SSE connections therefore occupy one
+yamux stream for their lifetime.
 
-### 2.2 `internal/config`
+## Ingress Protocols
 
-- 서버와 클라이언트가 공통으로 사용하는 설정 스키마 및 `.env`/환경 변수 로더를 제공합니다. (ko)  
+The public server uses one common `http.Handler` for all ingress protocols:
-- Provides shared config structs for server and client, plus `.env`/environment variable loaders. (en)
 
-- 주요 구조체 / Main structs: (ko/en)  
+- HTTP/1.1: ordinary reverse proxy and raw WebSocket Upgrade.
-  - `ServerConfig` — HTTP/HTTPS/DTLS 리스닝 주소, 도메인/프록시 도메인, Debug 플래그, 로그 설정. (ko)  
+- HTTP/2: ordinary reverse proxy, SSE, and RFC 8441 Extended CONNECT.
-  - `ServerConfig` — HTTP/HTTPS/DTLS listen addresses, main/proxy domains, debug flag, logging config. (en)  
+- HTTP/3: ordinary reverse proxy, SSE, and RFC 9220 Extended CONNECT.
-  - `ClientConfig` — 서버 주소, 도메인, 클라이언트 API Key, local_target, Debug 플래그, 로그 설정. (ko)  
-  - `ClientConfig` — server address, domain, client API key, local_target, debug flag, logging config. (en)
 
----
+HTTP/3 runs on a separate UDP listener using `quic-go/http3`, while the TCP
+HTTP/HTTPS listeners continue to serve HTTP/1.1 and HTTP/2. HTTP/1.1 and HTTP/2
+responses advertise HTTP/3 with `Alt-Svc`.
 
-### 2.3 `internal/acme`
+For HTTP/2 Extended CONNECT, Go's compatibility setting must be enabled when
+starting the process:
 
-- ACME(예: Let's Encrypt) 클라이언트 래퍼 및 인증서 매니저를 구현하는 패키지입니다. (ko)  
+```bash
-- Package that will wrap an ACME client (e.g. Let's Encrypt) and manage certificates. (en)
+GODEBUG=http2xconnect=1 ./bin/hop-gate-server
+```
 
-- 역할 / Responsibilities: (ko/en)
+## Streaming Policies
-  - 메인 도메인 및 프록시 서브도메인용 TLS 인증서 발급/갱신. (ko)
-  - Issue/renew TLS certificates for main and proxy domains. (en)
-  - HTTP-01 / TLS-ALPN-01 챌린지 처리 훅 제공. (ko)
-  - Provide hooks for HTTP-01 / TLS-ALPN-01 challenges. (en)
-  - HTTPS 및 gRPC 터널 리스너에 사용할 `*tls.Config` 제공. (ko)
-  - Provide `*tls.Config` for HTTPS and gRPC tunnel listeners. (en)
 
----
+Requests accepting `text/event-stream` are treated as SSE. They bypass the
+normal request-level proxy timeout, and response writes are flushed to the
+public client as they arrive. The client or upstream service is responsible for
+closing the SSE request context.
 
-### 2.4 (Reserved for legacy DTLS prototype)
+WebSocket Extended CONNECT is translated to a local HTTP/1.1 WebSocket
+handshake. After the handshake, the payload is relayed as a bidirectional raw
+stream. HTTP/3 Extended CONNECT follows the same application path as HTTP/2.
 
-> 초기 버전에서 DTLS 기반 터널을 실험했으나, 현재 설계에서는 **gRPC/HTTP2 터널만** 사용합니다.
+## Packages
-> DTLS 관련 코드는 점진적으로 제거하거나, 별도 브랜치/히스토리에서만 보존할 예정입니다. (ko)
-> Early iterations experimented with a DTLS-based tunnel, but the current design uses **gRPC/HTTP2 tunnels only**.
-> Any DTLS-related code is planned to be removed or kept only in historical branches. (en)
 
----
+- `internal/tunnel`: TLS dialing, yamux sessions, metadata, and stream lifecycle.
+- `cmd/server`: public HTTP/HTTPS/HTTP/3 ingress and yamux tunnel listener.
+- `cmd/client`: outbound yamux client and local HTTP/WebSocket forwarding.
+- `internal/admin`: domain registration and API-key validation.
+- `internal/acme`: certificate acquisition, renewal, and TLS configuration.
 
-### 2.5 `internal/protocol`
+The tunnel is intentionally stream-oriented. It does not implement application
-
+ACKs or retransmission; TLS over TCP and yamux provide ordered reliable delivery.
-- 서버와 클라이언트가 **gRPC/HTTP2 터널 전송 계층** 위에서 주고받는 HTTP 요청/응답 및 스트림 메시지 포맷을 정의합니다. (ko)
-- Defines HTTP request/response and stream message formats exchanged over the gRPC/HTTP2 tunnel transport layer. (en)
-
-- 요청 메시지 / Request message: (ko/en)
-  - `RequestID`, `ClientID`, `ServiceName`, `Method`, `URL`, `Header`, `Body`. (ko/en)
-
-- 응답 메시지 / Response message: (ko/en)
-  - `RequestID`, `Status`, `Header`, `Body`, `Error`. (ko/en)
-
-- 스트림 기반 터널링을 위한 Envelope/Stream 타입: (ko/en)
-  - [`Envelope`](internal/protocol/protocol.go:64) — 상위 메시지 컨테이너. (ko/en)
-  - [`StreamOpen`](internal/protocol/protocol.go:94) — 새로운 스트림 오픈 및 헤더/메타데이터 전달. (ko/en)
-  - [`StreamData`](internal/protocol/protocol.go:104) — 시퀀스 번호(Seq)를 가진 바디 chunk 프레임. (ko/en)
-  - [`StreamClose`](internal/protocol/protocol.go:143) — 스트림 종료 및 에러 정보 전달. (ko/en)
-  - [`StreamAck`](internal/protocol/protocol.go:117) — 선택적 재전송(Selective Retransmission)을 위한 ACK/NACK 힌트. (ko/en)
-
-- 이 구조는 Protobuf 기반 length-prefix 프레이밍을 사용하며, gRPC bi-di stream 의 메시지 타입으로 매핑됩니다. (ko)
-- This structure uses protobuf-based length-prefixed framing and is mapped onto messages in a gRPC bi-di stream. (en)
-
----
-
-### 2.6 `internal/proxy`
-
-- HTTP Reverse Proxy 및 클라이언트 측 로컬 프록시 코어 로직을 담당합니다. (ko)  
-- Contains the core logic for the HTTP reverse proxy on the server and the local proxy on the client. (en)
-
-#### 서버 측 역할 / Server-side role
-
-- 공인 HTTPS 엔드포인트에서 들어오는 요청을 수신합니다. (ko)
-- Receive incoming requests on the public HTTPS endpoint. (en)
-
-- 도메인/패스 규칙에 따라 적절한 클라이언트와 서비스로 매핑합니다. (ko)
-- Map requests to appropriate clients and services based on domain/path rules. (en)
-
-- 요청/응답을 `internal/protocol` 의 스트림 메시지(`StreamOpen` / `StreamData` / `StreamClose` 등)로 직렬화하여
-  서버–클라이언트 간 gRPC bi-di stream 위에서 주고받습니다. (ko)
-- Serialize requests/responses into stream messages from `internal/protocol` (`StreamOpen` / `StreamData` / `StreamClose`, etc.)
-  and exchange them between server and clients over a gRPC bi-di stream. (en)
-
-#### 클라이언트 측 역할 / Client-side role
-
-- 서버가 gRPC 터널을 통해 내려보낸 스트림 메시지를 수신합니다. (ko)
-- Receive stream messages sent by the server over the gRPC tunnel. (en)
-
-- 로컬 HTTP 서비스(예: 127.0.0.1:8080)에 요청을 전달하고 응답을 수신합니다. (ko)
-- Forward these requests to local HTTP services (e.g. 127.0.0.1:8080) and collect responses. (en)
-
-- 응답을 동일한 gRPC bi-di stream 상의 역방향 스트림 메시지로 직렬화하여 서버로 전송합니다. (ko)
-- Serialize responses as reverse-direction stream messages on the same gRPC bi-di stream and send them back to the server. (en)
-
----
-
-### 2.7 `internal/logging`
-
-- Loki/Grafana 스택에 적합한 구조적 JSON 로깅 인터페이스를 제공합니다. (ko)  
-- Provides a structured JSON logging interface compatible with the Loki/Grafana stack. (en)
-
-- 공통 필드 (예: component, request_id, client_id, domain 등)를 포함한 Logger 를 제공합니다. (ko)  
-- Offers a Logger that includes common fields (e.g., component, request_id, client_id, domain). (en)
-
----
-
-### 2.8 `ent/schema`
-
-- `Domain` 등 엔티티에 대한 ent 스키마를 정의합니다. (ko)  
-- Defines ent schemas for entities such as `Domain`. (en)
-
-- Domain 엔티티는 다음 정보를 포함합니다: (ko)  
-- The Domain entity contains the following fields: (en)  
-  - UUID `id` — 기본 키 / primary key. (ko/en)  
-  - `domain` — FQDN (예: app.example.com). (ko/en)  
-  - `client_api_key` — 클라이언트 인증용 64자 키. (ko/en)  
-  - `memo` — 관리자 메모. (ko/en)  
-  - `created_at`, `updated_at` — 감사용 타임스탬프. (ko/en)
-
----
-
-### 2.9 `pkg/util` (optional)
-
-- 재사용 가능한 헬퍼 함수/유틸리티를 둘 수 있는 선택적 패키지입니다. (ko)  
-- Optional package for reusable helpers and utilities. (en)
-
----
-
-## 3. Request Flow Summary / 요청 흐름 요약
-
-1. 외부 사용자가 `https://proxy.example.com/service-a/path` 로 HTTPS 요청을 보냅니다. (ko)
-An external user sends an HTTPS request to `https://proxy.example.com/service-a/path`. (en)
-
-2. HopGate 서버의 HTTPS 리스너가 요청을 수신합니다. (ko)  
-The HTTPS listener on the HopGate server receives the request. (en)
-
-3. `proxy` 레이어가 도메인과 경로를 기반으로 이 요청을 처리할 클라이언트(예: client-1)와 해당 로컬 서비스(`service-a`)를 결정합니다. (ko)
-The `proxy` layer decides which client (e.g., client-1) and which local service (`service-a`) should handle the request, based on domain and path. (en)
-
-4. 서버는 요청을 `internal/protocol` 의 스트림 메시지(예: `StreamOpen` + 여러 `StreamData` + `StreamClose`)로 직렬화하고,
-   선택된 클라이언트와 맺은 gRPC bi-di stream 을 통해 전송합니다. (ko)
-   The server serializes the request into stream messages from `internal/protocol` (e.g., `StreamOpen` + multiple `StreamData` + `StreamClose`)
-   and sends them over a gRPC bi-di stream to the selected client. (en)
-
-5. 클라이언트의 `proxy` 레이어는 이 스트림 메시지들을 수신해 로컬 서비스(예: 127.0.0.1:8080)에 HTTP 요청을 수행합니다. (ko)
-   The client’s `proxy` layer receives these stream messages and performs an HTTP request to a local service (e.g., 127.0.0.1:8080). (en)
-
-6. 클라이언트는 로컬 서비스로부터 HTTP 응답을 수신하고, 이를 역방향 스트림 메시지(`StreamOpen` + 여러 `StreamData` + `StreamClose`)로 직렬화하여
-   동일한 gRPC bi-di stream 을 통해 서버로 다시 전송합니다. (ko)
-   The client receives the HTTP response from the local service, serializes it as reverse-direction stream messages
-   (`StreamOpen` + multiple `StreamData` + `StreamClose`), and sends them back to the server over the same gRPC bi-di stream. (en)
-
-7. 서버는 응답 스트림 메시지를 조립해 원래의 HTTPS 요청에 대한 HTTP 응답으로 변환한 뒤, 외부 사용자에게 반환합니다. (ko)
-   The server reassembles the response stream messages into an HTTP response for the original HTTPS request and returns it to the external user. (en)
-
-![architecture.jpeg](images/architecture.jpeg)
-
----
-
-## 4. Next Steps / 다음 단계
-
-- 위 아키텍처를 기반으로 디렉터리와 엔트리 포인트를 생성/정리합니다. (ko)
-- Use this architecture to create/organize directories and entrypoints. (en)
-
-- `internal/config` 에 필요한 설정 필드와 `.env` 로더를 확장합니다. (ko)
-- Extend `internal/config` with required config fields and `.env` loaders. (en)
-
-- `internal/acme` 에 ACME 클라이언트(certmagic 또는 lego 등)를 연결해 TLS 인증서 발급/갱신을 구현합니다. (ko)
-- Wire an ACME client (certmagic, lego, etc.) into `internal/acme` to implement TLS certificate issuance/renewal. (en)
-
-- gRPC/HTTP2 기반 터널 전송 계층을 설계/구현하고, 서버/클라이언트 모두에서 장기 유지 bi-di stream 위에
-  HTTP 요청/응답을 멀티플렉싱하는 로직을 추가합니다. (ko)
-- Design and implement a gRPC/HTTP2-based tunnel transport layer, adding logic on both server and client to multiplex HTTP requests/responses over long-lived bi-di streams. (en)
-
-- `internal/protocol` 과 `internal/proxy` 를 통해 실제 HTTP 터널링을 구현하고,
-  gRPC 기반 스트림 모델이 재사용할 수 있는 논리 프로토콜로 정리합니다. (ko)
-- Implement real HTTP tunneling and routing rules via `internal/protocol` and `internal/proxy`,
-  organizing the logical protocol so that the gRPC-based stream model can reuse it. (en)
-
-- `internal/admin` + `ent` + PostgreSQL 을 사용해 Domain 등록/해제 및 클라이언트 API Key 발급을 완성합니다. (ko)
-- Complete domain registration/unregistration and client API key issuing using `internal/admin` + `ent` + PostgreSQL. (en)
-
-- 로깅/메트릭을 Prometheus + Loki + Grafana 스택과 연동하여 운영 가시성을 확보합니다. (ko)
-- Integrate logging/metrics with the Prometheus + Loki + Grafana stack to gain operational visibility. (en)

Dockerfile.server

@@ -12,7 +12,7 @@
 #     hop-gate-server:dev
 
 # ---------- Build stage ----------
-FROM golang:1.25-alpine AS builder
+FROM golang:1.27-alpine AS builder
 
 # BuildKit / buildx 가 제공하는 타겟 OS/ARCH 인자를 사용해 멀티 아키텍처 빌드를 지원합니다.
 # 기본값을 지정해두면 로컬 docker build 시에도 별도 인자 없이 빌드 가능합니다.
@@ -38,7 +38,7 @@ COPY . .
 RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -ldflags "-X main.version=${VERSION}" -o /out/hop-gate-server ./cmd/server
 
 # ---------- Runtime stage ----------
-FROM alpine:3.20
+FROM alpine:3.24
 
 WORKDIR /app
 

Makefile

@@ -75,7 +75,6 @@ docker-server:
 check-env-server:
 	@if [ -z "$$HOP_SERVER_HTTP_LISTEN" ]; then echo "필수 환경 변수 HOP_SERVER_HTTP_LISTEN이 설정되지 않았습니다."; exit 1; fi
 	@if [ -z "$$HOP_SERVER_HTTPS_LISTEN" ]; then echo "필수 환경 변수 HOP_SERVER_HTTPS_LISTEN가 설정되지 않았습니다."; exit 1; fi
-	@if [ -z "$$HOP_SERVER_DTLS_LISTEN" ]; then echo "필수 환경 변수 HOP_SERVER_DTLS_LISTEN가 설정되지 않았습니다."; exit 1; fi
 	@if [ -z "$$HOP_SERVER_DOMAIN" ]; then echo "필수 환경 변수 HOP_SERVER_DOMAIN가 설정되지 않았습니다."; exit 1; fi
 
 check-env-client:
@@ -84,22 +83,3 @@ check-env-client:
 	@if [ -z "$$HOP_CLIENT_API_KEY" ]; then echo "필수 환경 변수 HOP_CLIENT_API_KEY가 설정되지 않았습니다."; exit 1; fi
 	@if [ -z "$$HOP_CLIENT_LOCAL_TARGET" ]; then echo "필수 환경 변수 HOP_CLIENT_LOCAL_TARGET가 설정되지 않았습니다."; exit 1; fi
 	@if [ -z "$$HOP_CLIENT_DEBUG" ]; then echo "필수 환경 변수 HOP_CLIENT_DEBUG가 설정되지 않았습니다."; exit 1; fi
-
-# --- Protobuf code generation -------------------------------------------------
-# Requires:
-#   - protoc (https://grpc.io/docs/protoc-installation/)
-#   - protoc-gen-go (go install google.golang.org/protobuf/cmd/protoc-gen-go@latest)
-#
-# Generates Go types under internal/protocol/pb from internal/protocol/hopgate_stream.proto.
-# NOTE:
-#   - go_package in hopgate_stream.proto is set to:
-#       github.com/dalbodeule/hop-gate/internal/protocol/pb;protocolpb
-#   - With --go_out=. (without paths=source_relative), protoc will place the
-#     generated file under internal/protocol/pb according to go_package.
-proto:
-	@echo "Generating Go code from Protobuf schemas..."
-	protoc \
-		--go_out=. \
-		internal/protocol/hopgate_stream.proto
-	@echo "Protobuf generation completed."
-

README.md

@@ -4,22 +4,22 @@
 
 ## 1. 프로젝트 개요 (Project Overview)
 
-HopGate는 공인 서버와 여러 프라이빗 네트워크 클라이언트 사이에 **DTLS 기반 HTTP 터널**을 제공하는 게이트웨이입니다.
+HopGate는 공인 서버와 여러 프라이빗 네트워크 클라이언트 사이에 **TLS + yamux 기반 HTTP 터널**을 제공하는 게이트웨이입니다.
-HopGate is a gateway that provides a **DTLS-based HTTP tunnel** between a public server and multiple private-network clients.
+HopGate is a gateway that provides a **TLS + yamux HTTP tunnel** between a public server and multiple private-network clients.
 
 주요 특징 (Key features):
 
 - 서버는 80/443 포트를 점유하고, ACME(Let's Encrypt 등)로 TLS 인증서를 자동 발급/갱신합니다.
   The server listens on ports 80/443 and automatically issues/renews TLS certificates via ACME (e.g. Let's Encrypt).
-- 서버–클라이언트 간 전송은 DTLS 위에서 이루어지며, 현재는 HTTP 요청/응답을 **Protobuf 기반 length-prefixed Envelope** 로 터널링합니다.
+- 서버–클라이언트 간 기본 전송은 TLS 위의 TCP와 yamux이며, 하나의 연결에 여러 HTTP logical stream을 multiplex합니다.
-  Transport between server and clients uses DTLS; HTTP requests/responses are tunneled as **Protobuf-based, length-prefixed envelopes**.
+  The default transport is TCP + TLS with yamux multiplexing, carrying multiple HTTP logical streams over one connection.
 - 관리 Plane(REST API)을 통해 도메인 등록/해제 및 클라이언트 API Key 발급을 수행합니다.
   An admin management plane (REST API) handles domain registration/unregistration and client API key issuance.
 - 로그는 JSON 구조 형태로 stdout 에 출력되며, Prometheus + Loki + Grafana 스택에 친화적으로 설계되었습니다.
   Logs are JSON-structured and designed to work well with a Prometheus + Loki + Grafana stack.
 
-> 참고: 대용량 HTTP 바디에 대해서는 DTLS/UDP MTU 한계 때문에 **단일 Envelope** 로는 한계가 있으므로, `progress.md` 의 3.3A 섹션에 정리된 것처럼 `StreamOpen` / `StreamData` / `StreamClose` 기반의 스트림/프레임 터널링으로 점진적으로 전환할 예정입니다. (ko)
+> 참고: yamux logical stream은 HTTP/1.1 wire format을 사용하지만, 요청과 응답 body는 버퍼 전체를 메모리에 올리지 않고 스트리밍됩니다. SSE는 연결이 유지되는 동안 이벤트를 즉시 전달합니다. (ko)
-> Note: For very large HTTP bodies, a single-envelope model still hits DTLS/UDP MTU limits. As outlined in section 3.3A of `progress.md`, the plan is to gradually move to a stream/frame-based tunneling model using `StreamOpen` / `StreamData` / `StreamClose`. (en)
+> Note: yamux logical streams use HTTP/1.1 wire format, while request and response bodies are streamed without buffering the entire payload in memory. SSE events are delivered while the connection remains open. (en)
 
 아키텍처 세부 내용은 [`ARCHITECTURE.md`](ARCHITECTURE.md)에 정리되어 있습니다.  
 Detailed architecture is documented in [`ARCHITECTURE.md`](ARCHITECTURE.md).
@@ -31,7 +31,7 @@ Detailed architecture is documented in [`ARCHITECTURE.md`](ARCHITECTURE.md).
 - 서버 엔트리 (Server entrypoint): [`cmd/server/main.go`](cmd/server/main.go)  
 - 클라이언트 엔트리 (Client entrypoint): [`cmd/client/main.go`](cmd/client/main.go)
 - 설정 로더 (Config loader): [`internal/config/config.go`](internal/config/config.go)
-- DTLS 추상/구현 (DTLS abstraction & implementation): [`internal/dtls`](internal/dtls)
+- TLS + yamux 터널 (TLS + yamux tunnel): [`internal/tunnel`](internal/tunnel)
 - 관리 Plane (Admin plane HTTP API): [`internal/admin`](internal/admin)
 - 도메인 스키마 (Domain schema, ent): [`ent/schema/domain.go`](ent/schema/domain.go)
 
@@ -41,8 +41,8 @@ Detailed architecture is documented in [`ARCHITECTURE.md`](ARCHITECTURE.md).
 
 ### 3.1 의존성 (Dependencies)
 
-- Go 1.21+ 권장 (go.mod 상 버전보다 최신 Go 사용을 추천)
+- Go 1.27.0+ 필요
-  Go 1.21+ is recommended (even if go.mod specifies an older minor).
+  Go 1.27.0 or newer is required.
 - PostgreSQL (관리 Plane + 실제 DomainValidator 에 필수)
   PostgreSQL (required for the admin plane and the real DomainValidator).
 
@@ -106,7 +106,7 @@ Required environment variables are validated in two stages:
 
 2. **실행 단계 (Runtime) – 엔트리포인트에서 엄격 검증 (strict runtime validation)**
    - 서버: [`cmd/server/main.go`](cmd/server/main.go)
-     - 헬퍼 `getEnvOrPanic(logger, key)` 를 사용해 `HOP_SERVER_HTTP_LISTEN`, `HOP_SERVER_HTTPS_LISTEN`, `HOP_SERVER_DTLS_LISTEN`, `HOP_SERVER_DOMAIN`, `HOP_SERVER_DEBUG` 가 비어 있지 않은지 확인합니다.
+     - 헬퍼 `getEnvOrPanic(logger, key)` 를 사용해 `HOP_SERVER_HTTP_LISTEN`, `HOP_SERVER_HTTPS_LISTEN`, `HOP_SERVER_DOMAIN`, `HOP_SERVER_DEBUG` 가 비어 있지 않은지 확인합니다.
      - 누락되었거나 공백인 경우, 구조화 에러 로그(JSON)와 함께 프로세스를 종료합니다.
    - 클라이언트: [`cmd/client/main.go`](cmd/client/main.go)
      - `HOP_CLIENT_SERVER_ADDR`, `HOP_CLIENT_DOMAIN`, `HOP_CLIENT_API_KEY`, `HOP_CLIENT_LOCAL_TARGET`, `HOP_CLIENT_DEBUG` 를 동일한 방식으로 검증합니다.
@@ -117,41 +117,41 @@ Required environment variables are validated in two stages:
 로컬 개발에서는 `.env.example` 을 복사한 `.env` 파일을 사용해 빠르게 설정을 구성할 수 있습니다.
 For production deployments, prefer OS-level env (Kubernetes `env`, Docker `-e`, systemd `Environment=`, etc.), and use a local `.env` (copied from `.env.example`) mainly for development.
 
-## 4. DTLS 핸드셰이크 테스트 (Testing DTLS Handshake)
+## 4. TLS + yamux 터널 설정 (TLS + yamux tunnel configuration)
 
-HopGate는 DTLS 위에서 **도메인 + 클라이언트 API Key** 기반의 애플리케이션 레벨 핸드셰이크를 수행합니다.  
+HopGate는 TLS 연결 위의 yamux control stream에서 **도메인 + 클라이언트 API Key** 기반의 핸드셰이크를 수행합니다.
-HopGate performs an application-level handshake over DTLS using **domain + client API key**.
+HopGate authenticates a yamux control stream using **domain + client API key**.
 
 ### 4.1 서버 설정 예시 (Server .env example)
 
 `.env`:
 
 ```env
-HOP_SERVER_DTLS_LISTEN=:8443
+HOP_SERVER_TUNNEL_LISTEN=:7443
 HOP_SERVER_DEBUG=true
 ```
 
-- `HOP_SERVER_DTLS_LISTEN`  
+- `HOP_SERVER_TUNNEL_LISTEN`
-  DTLS 서버가 바인딩할 UDP 포트입니다. 예: `:8443`  
+  TLS + yamux 서버가 바인딩할 TCP 포트입니다. 예: `:7443`
-  UDP port for the DTLS server to bind on, e.g. `:8443`.
+  TCP port for the TLS + yamux server to bind on, e.g. `:7443`.
 - `HOP_SERVER_DEBUG=true`  
-  디버그 모드에서는 [`dtls.NewSelfSignedLocalhostConfig()`](internal/dtls/selfsigned.go) 를 사용해 self-signed localhost 인증서를 생성합니다.  
+  디버그 모드에서는 인증서 검증을 생략할 수 있습니다. 이는 개발 환경에서만 사용해야 합니다.
-  In debug mode the server uses [`dtls.NewSelfSignedLocalhostConfig()`](internal/dtls/selfsigned.go) to generate a self-signed localhost certificate.
+  In debug mode certificate verification may be skipped. Use this only for development.
 
 ### 4.2 클라이언트 설정 예시 (Client .env example)
 
 `.env`:
 
 ```env
-HOP_CLIENT_SERVER_ADDR=localhost:8443
+HOP_CLIENT_SERVER_ADDR=localhost:7443
 HOP_CLIENT_DOMAIN=test.example.com
 HOP_CLIENT_API_KEY=TEST_LOCALHOST_API_KEY_0123456789_ABCDEFGHIJKLMNOPQRSTUVWXYZ
 HOP_CLIENT_LOCAL_TARGET=127.0.0.1:8080
 HOP_CLIENT_DEBUG=true
 ```
 
-- `HOP_CLIENT_SERVER_ADDR` : DTLS 서버 주소 (예: `localhost:8443`)
+- `HOP_CLIENT_SERVER_ADDR` : yamux 터널 서버 주소 (예: `localhost:7443`)
-  DTLS server address, e.g. `localhost:8443`.
+  yamux tunnel server address, e.g. `localhost:7443`.
 - `HOP_CLIENT_DOMAIN` / `HOP_CLIENT_API_KEY` : 관리 Plane 에서 발급받은 도메인/키 (실제 ent + PostgreSQL 기반 DomainValidator 에 의해 검증)
   Domain and API key issued by the admin plane (validated by a real ent + PostgreSQL based DomainValidator).
 - `HOP_CLIENT_LOCAL_TARGET` : 실제로 HTTP 요청을 보낼 로컬 서버 주소
@@ -169,6 +169,17 @@ HOP_CLIENT_DEBUG=true
 ./bin/hop-gate-client
 ```
 
+HTTP/3 ingress를 사용하려면 서버의 TCP HTTPS 포트와 동일한 UDP 포트를 외부에 노출해야 합니다.
+HTTP/3 ingress requires exposing the same port as the HTTPS listener over UDP.
+
+HTTP/2 Extended CONNECT를 사용하는 클라이언트가 있는 경우 Go HTTP/2의
+호환성 설정을 켜고 서버를 실행합니다.
+For HTTP/2 Extended CONNECT clients, enable Go's compatibility setting:
+
+```bash
+GODEBUG=http2xconnect=1 ./bin/hop-gate-server
+```
+
 성공 시 로그에는 다음과 같은 정보가 찍힙니다.  
 On success, logs will include information like:
 
@@ -210,12 +221,37 @@ For implementation skeleton, see [`internal/admin`](internal/admin) and [`ent/sc
 
 - `Debug=true` 설정은 **개발/테스트 용도**입니다. self-signed 인증서 및 InsecureSkipVerify 사용은 프로덕션 환경에서 절대 사용하지 마세요.
   `Debug=true` is strictly for development/testing. Do not use self-signed certs or InsecureSkipVerify in production.
-- 현재 버전은 ACME 기반 인증서, PostgreSQL + ent 기반 DomainValidator, Proxy 레이어가 기본적으로 연동되어 있으나,
+- 현재 yamux 경로는 HTTP/1.1·HTTP/2·HTTP/3 공개 요청, SSE, HTTP/1.1 WebSocket raw upgrade와 HTTP/2·HTTP/3 Extended CONNECT를 처리합니다.
-  대용량 HTTP 바디에 대해서는 JSON 단일 메시지 기반 터널링 특성상 DTLS/UDP MTU 한계에 부딪힐 수 있습니다.
+  The yamux path handles public HTTP/1.1, HTTP/2, and HTTP/3 requests, SSE, HTTP/1.1 WebSocket raw upgrade, and HTTP/2 and HTTP/3 Extended CONNECT.
-  스트림/프레임 기반 DTLS 터널링으로의 전환 및 하드닝 작업은 `progress.md` 에 정의된 다음 단계에 포함되어 있습니다. (ko)
+
-  The current version wires ACME certificates, a PostgreSQL+ent-based DomainValidator, and the proxy layer by default,
+### Supported Ingress Protocols
-  but for very large HTTP bodies the JSON single-message tunneling model can still hit DTLS/UDP MTU limits.
+
-  Moving to a stream/frame-based DTLS tunneling model and further hardening are tracked as next steps in `progress.md`. (en)
+| Ingress | 일반 HTTP | SSE | WebSocket 방식 |
+| --- | --- | --- | --- |
+| HTTP/1.1 | 지원 | 지원 | HTTP/1.1 Upgrade |
+| HTTP/2 | 지원 | 지원 | Extended CONNECT |
+| HTTP/3 | 지원 | 지원 | Extended CONNECT |
+
+모든 ingress는 동일한 TLS + yamux 터널을 통해 클라이언트의 로컬 HTTP 서비스로 전달됩니다.
+All ingress protocols use the same TLS + yamux tunnel to reach the client's local HTTP service.
+
+### SSE and Extended CONNECT WebSocket
+
+SSE responses are streamed through the yamux stream and do not use the normal
+proxy timeout when the request accepts `text/event-stream`. This policy applies
+to HTTP/1.1, HTTP/2, and HTTP/3 ingress alike; the client is responsible for
+closing the request context when the SSE connection should end.
+
+HTTP/2 WebSocket Extended CONNECT is enabled by the Go HTTP/2 implementation
+with the following process setting:
+
+```bash
+GODEBUG=http2xconnect=1 go run ./cmd/server
+```
+
+The Extended CONNECT path translates the HTTP/2 or HTTP/3 WebSocket handshake
+to the existing local HTTP/1.1 WebSocket connector, then relays the
+bidirectional stream through yamux.
 
 HopGate는 아직 초기 단계의 실험적 프로젝트입니다. API 및 동작은 언제든지 변경될 수 있습니다.
 HopGate is still experimental; APIs and behavior may change at any time.

cmd/client/main.go

@@ -1,47 +1,26 @@
 package main
 
 import (
-	"bytes"
 	"context"
-	"crypto/tls"
-	"crypto/x509"
 	"flag"
-	"fmt"
-	"io"
-	"net"
-	"net/http"
-	"net/url"
 	"os"
-	"strconv"
 	"strings"
-	"sync"
-	"time"
-
-	"google.golang.org/grpc"
-	"google.golang.org/grpc/credentials"
 
 	"github.com/dalbodeule/hop-gate/internal/config"
 	"github.com/dalbodeule/hop-gate/internal/logging"
-	"github.com/dalbodeule/hop-gate/internal/protocol"
-	protocolpb "github.com/dalbodeule/hop-gate/internal/protocol/pb"
 )
 
-// version 은 빌드 시 -ldflags "-X main.version=xxxxxxx" 로 덮어쓰이는 필드입니다.
-// 기본값 "dev" 는 로컬 개발용입니다.
 var version = "dev"
 
 func getEnvOrPanic(logger logging.Logger, key string) string {
 	value, exists := os.LookupEnv(key)
 	if !exists || strings.TrimSpace(value) == "" {
-		logger.Error("missing required environment variable", logging.Fields{
+		logger.Error("missing required environment variable", logging.Fields{"env": key})
-			"env": key,
-		})
 		os.Exit(1)
 	}
 	return value
 }
 
-// maskAPIKey 는 로그에 노출할 때 클라이언트 API Key 를 일부만 보여주기 위한 헬퍼입니다.
 func maskAPIKey(key string) string {
 	if len(key) <= 8 {
 		return "***"
@@ -49,747 +28,68 @@ func maskAPIKey(key string) string {
 	return key[:4] + "..." + key[len(key)-4:]
 }
 
-// firstNonEmpty 는 앞에서부터 처음으로 non-empty 인 문자열을 반환합니다.
 func firstNonEmpty(values ...string) string {
-	for _, v := range values {
+	for _, value := range values {
-		if strings.TrimSpace(v) != "" {
+		if strings.TrimSpace(value) != "" {
-			return v
+			return value
 		}
 	}
 	return ""
 }
 
-// runGRPCTunnelClient 는 gRPC 기반 터널을 사용하는 실험적 클라이언트 진입점입니다. (ko)
-// runGRPCTunnelClient is an experimental entrypoint for a gRPC-based tunnel client. (en)
-func runGRPCTunnelClient(ctx context.Context, logger logging.Logger, finalCfg *config.ClientConfig) error {
-	// TLS 설정은 기존 DTLS 클라이언트와 동일한 정책을 사용합니다. (ko)
-	// TLS configuration mirrors the existing DTLS client policy. (en)
-	var tlsCfg *tls.Config
-	if finalCfg.Debug {
-		tlsCfg = &tls.Config{
-			InsecureSkipVerify: true,
-			MinVersion:         tls.VersionTLS12,
-		}
-	} else {
-		rootCAs, err := x509.SystemCertPool()
-		if err != nil || rootCAs == nil {
-			rootCAs = x509.NewCertPool()
-		}
-		tlsCfg = &tls.Config{
-			RootCAs:    rootCAs,
-			MinVersion: tls.VersionTLS12,
-		}
-	}
-
-	// finalCfg.ServerAddr 가 "host:port" 형태이므로, SNI 에는 DNS(host) 부분만 넣어야 한다.
-	host := finalCfg.ServerAddr
-	if h, _, err := net.SplitHostPort(finalCfg.ServerAddr); err == nil && strings.TrimSpace(h) != "" {
-		host = h
-	}
-	tlsCfg.ServerName = host
-
-	creds := credentials.NewTLS(tlsCfg)
-
-	log := logger.With(logging.Fields{
-		"component":    "grpc_tunnel_client",
-		"server_addr":  finalCfg.ServerAddr,
-		"domain":       finalCfg.Domain,
-		"local_target": finalCfg.LocalTarget,
-	})
-
-	log.Info("dialing grpc tunnel", nil)
-
-	conn, err := grpc.DialContext(ctx, finalCfg.ServerAddr, grpc.WithTransportCredentials(creds), grpc.WithBlock())
-	if err != nil {
-		log.Error("failed to dial grpc tunnel server", logging.Fields{
-			"error": err.Error(),
-		})
-		return err
-	}
-	defer conn.Close()
-
-	client := protocolpb.NewHopGateTunnelClient(conn)
-
-	stream, err := client.OpenTunnel(ctx)
-	if err != nil {
-		log.Error("failed to open grpc tunnel stream", logging.Fields{
-			"error": err.Error(),
-		})
-		return err
-	}
-
-	log.Info("grpc tunnel stream opened", nil)
-
-	// 초기 핸드셰이크: 도메인, API 키, 로컬 타깃 정보를 StreamOpen 헤더로 전송합니다. (ko)
-	// Initial handshake: send domain, API key, and local target via StreamOpen headers. (en)
-	headers := map[string]*protocolpb.HeaderValues{
-		"X-HopGate-Domain":       {Values: []string{finalCfg.Domain}},
-		"X-HopGate-API-Key":      {Values: []string{finalCfg.ClientAPIKey}},
-		"X-HopGate-Local-Target": {Values: []string{finalCfg.LocalTarget}},
-	}
-
-	open := &protocolpb.StreamOpen{
-		Id:          "control-0",
-		ServiceName: "control",
-		TargetAddr:  "",
-		Header:      headers,
-	}
-
-	env := &protocolpb.Envelope{
-		Payload: &protocolpb.Envelope_StreamOpen{
-			StreamOpen: open,
-		},
-	}
-
-	if err := stream.Send(env); err != nil {
-		log.Error("failed to send initial stream_open handshake", logging.Fields{
-			"error": err.Error(),
-		})
-		return err
-	}
-
-	log.Info("sent initial stream_open handshake on grpc tunnel", logging.Fields{
-		"domain":       finalCfg.Domain,
-		"local_target": finalCfg.LocalTarget,
-		"api_key_mask": maskAPIKey(finalCfg.ClientAPIKey),
-	})
-
-	// 로컬 HTTP 프록시용 HTTP 클라이언트 구성. (ko)
-	// HTTP client used to forward requests to the local target. (en)
-	httpClient := &http.Client{
-		Timeout: 30 * time.Second,
-		Transport: &http.Transport{
-			Proxy: http.ProxyFromEnvironment,
-			DialContext: (&net.Dialer{
-				Timeout:   10 * time.Second,
-				KeepAlive: 30 * time.Second,
-			}).DialContext,
-			ForceAttemptHTTP2:     true,
-			MaxIdleConns:          100,
-			IdleConnTimeout:       90 * time.Second,
-			TLSHandshakeTimeout:   10 * time.Second,
-			ExpectContinueTimeout: 1 * time.Second,
-		},
-	}
-
-	// 서버→클라이언트 방향 StreamOpen/StreamData/StreamClose 를
-	// HTTP 요청 단위로 모으기 위한 per-stream 상태 테이블입니다. (ko)
-	// Per-stream state table to assemble HTTP requests from StreamOpen/Data/Close. (en)
-	type inboundStream struct {
-		open *protocolpb.StreamOpen
-		body bytes.Buffer
-	}
-
-	streams := make(map[string]*inboundStream)
-	var streamsMu sync.Mutex
-
-	// gRPC 스트림에 대한 Send 는 동시 호출이 안전하지 않으므로, sendMu 로 직렬화합니다. (ko)
-	// gRPC streaming Send is not safe for concurrent calls; protect with a mutex. (en)
-	var sendMu sync.Mutex
-	sendEnv := func(e *protocolpb.Envelope) error {
-		sendMu.Lock()
-		defer sendMu.Unlock()
-		return stream.Send(e)
-	}
-
-	// 서버에서 전달된 StreamOpen/StreamData/StreamClose 를 로컬 HTTP 요청으로 변환하고,
-	// 응답을 StreamOpen/StreamData/StreamClose 로 다시 서버에 전송하는 헬퍼입니다. (ko)
-	// handleStream forwards a single logical HTTP request to the local target
-	// and sends the response back as StreamOpen/StreamData/StreamClose frames. (en)
-	handleStream := func(so *protocolpb.StreamOpen, body []byte) {
-		go func() {
-			streamID := strings.TrimSpace(so.Id)
-			if streamID == "" {
-				log.Error("inbound stream has empty id", logging.Fields{})
-				return
-			}
-
-			if finalCfg.LocalTarget == "" {
-				log.Error("local target is empty; cannot forward request", logging.Fields{
-					"stream_id": streamID,
-				})
-				return
-			}
-
-			// Pseudo-headers 에서 메서드/URL/Host 추출. (ko)
-			// Extract method/URL/host from pseudo-headers. (en)
-			method := http.MethodGet
-			if hv, ok := so.Header[protocol.HeaderKeyMethod]; ok && hv != nil && len(hv.Values) > 0 && strings.TrimSpace(hv.Values[0]) != "" {
-				method = hv.Values[0]
-			}
-			urlStr := "/"
-			if hv, ok := so.Header[protocol.HeaderKeyURL]; ok && hv != nil && len(hv.Values) > 0 && strings.TrimSpace(hv.Values[0]) != "" {
-				urlStr = hv.Values[0]
-			}
-
-			u, err := url.Parse(urlStr)
-			if err != nil {
-				errMsg := fmt.Sprintf("parse url from stream_open: %v", err)
-				log.Error("failed to parse url from stream_open", logging.Fields{
-					"stream_id": streamID,
-					"error":     err.Error(),
-				})
-
-				respHeader := map[string]*protocolpb.HeaderValues{
-					"Content-Type": {
-						Values: []string{"text/plain; charset=utf-8"},
-					},
-					protocol.HeaderKeyStatus: {
-						Values: []string{strconv.Itoa(http.StatusBadGateway)},
-					},
-				}
-				respOpen := &protocolpb.Envelope{
-					Payload: &protocolpb.Envelope_StreamOpen{
-						StreamOpen: &protocolpb.StreamOpen{
-							Id:          streamID,
-							ServiceName: so.ServiceName,
-							TargetAddr:  so.TargetAddr,
-							Header:      respHeader,
-						},
-					},
-				}
-				if err2 := sendEnv(respOpen); err2 != nil {
-					log.Error("failed to send error stream_open from client", logging.Fields{
-						"stream_id": streamID,
-						"error":     err2.Error(),
-					})
-					return
-				}
-
-				dataEnv := &protocolpb.Envelope{
-					Payload: &protocolpb.Envelope_StreamData{
-						StreamData: &protocolpb.StreamData{
-							Id:   streamID,
-							Seq:  0,
-							Data: []byte("HopGate client: " + errMsg),
-						},
-					},
-				}
-				if err2 := sendEnv(dataEnv); err2 != nil {
-					log.Error("failed to send error stream_data from client", logging.Fields{
-						"stream_id": streamID,
-						"error":     err2.Error(),
-					})
-					return
-				}
-
-				closeEnv := &protocolpb.Envelope{
-					Payload: &protocolpb.Envelope_StreamClose{
-						StreamClose: &protocolpb.StreamClose{
-							Id:    streamID,
-							Error: errMsg,
-						},
-					},
-				}
-				if err2 := sendEnv(closeEnv); err2 != nil {
-					log.Error("failed to send error stream_close from client", logging.Fields{
-						"stream_id": streamID,
-						"error":     err2.Error(),
-					})
-				}
-				return
-			}
-			u.Scheme = "http"
-			u.Host = finalCfg.LocalTarget
-
-			// 로컬 HTTP 요청용 헤더 구성 (pseudo-headers 제거). (ko)
-			// Build local HTTP headers, stripping pseudo-headers. (en)
-			httpHeader := make(http.Header, len(so.Header))
-			for k, hv := range so.Header {
-				if k == protocol.HeaderKeyMethod ||
-					k == protocol.HeaderKeyURL ||
-					k == protocol.HeaderKeyHost ||
-					k == protocol.HeaderKeyStatus {
-					continue
-				}
-				if hv == nil {
-					continue
-				}
-				for _, v := range hv.Values {
-					httpHeader.Add(k, v)
-				}
-			}
-
-			var reqBody io.Reader
-			if len(body) > 0 {
-				reqBody = bytes.NewReader(body)
-			}
-
-			req, err := http.NewRequestWithContext(ctx, method, u.String(), reqBody)
-			if err != nil {
-				errMsg := fmt.Sprintf("create http request from stream: %v", err)
-				log.Error("failed to create local http request", logging.Fields{
-					"stream_id": streamID,
-					"error":     err.Error(),
-				})
-
-				respHeader := map[string]*protocolpb.HeaderValues{
-					"Content-Type": {
-						Values: []string{"text/plain; charset=utf-8"},
-					},
-					protocol.HeaderKeyStatus: {
-						Values: []string{strconv.Itoa(http.StatusBadGateway)},
-					},
-				}
-				respOpen := &protocolpb.Envelope{
-					Payload: &protocolpb.Envelope_StreamOpen{
-						StreamOpen: &protocolpb.StreamOpen{
-							Id:          streamID,
-							ServiceName: so.ServiceName,
-							TargetAddr:  so.TargetAddr,
-							Header:      respHeader,
-						},
-					},
-				}
-				if err2 := sendEnv(respOpen); err2 != nil {
-					log.Error("failed to send error stream_open from client", logging.Fields{
-						"stream_id": streamID,
-						"error":     err2.Error(),
-					})
-					return
-				}
-
-				dataEnv := &protocolpb.Envelope{
-					Payload: &protocolpb.Envelope_StreamData{
-						StreamData: &protocolpb.StreamData{
-							Id:   streamID,
-							Seq:  0,
-							Data: []byte("HopGate client: " + errMsg),
-						},
-					},
-				}
-				if err2 := sendEnv(dataEnv); err2 != nil {
-					log.Error("failed to send error stream_data from client", logging.Fields{
-						"stream_id": streamID,
-						"error":     err2.Error(),
-					})
-					return
-				}
-
-				closeEnv := &protocolpb.Envelope{
-					Payload: &protocolpb.Envelope_StreamClose{
-						StreamClose: &protocolpb.StreamClose{
-							Id:    streamID,
-							Error: errMsg,
-						},
-					},
-				}
-				if err2 := sendEnv(closeEnv); err2 != nil {
-					log.Error("failed to send error stream_close from client", logging.Fields{
-						"stream_id": streamID,
-						"error":     err2.Error(),
-					})
-				}
-				return
-			}
-			req.Header = httpHeader
-			if len(body) > 0 {
-				req.ContentLength = int64(len(body))
-			}
-
-			start := time.Now()
-			logReq := log.With(logging.Fields{
-				"component":    "grpc_client_proxy",
-				"stream_id":    streamID,
-				"service":      so.ServiceName,
-				"method":       method,
-				"url":          urlStr,
-				"local_target": finalCfg.LocalTarget,
-			})
-			logReq.Info("forwarding stream http request to local target", nil)
-
-			res, err := httpClient.Do(req)
-			if err != nil {
-				errMsg := fmt.Sprintf("perform local http request: %v", err)
-				logReq.Error("local http request failed", logging.Fields{
-					"error": err.Error(),
-				})
-
-				respHeader := map[string]*protocolpb.HeaderValues{
-					"Content-Type": {
-						Values: []string{"text/plain; charset=utf-8"},
-					},
-					protocol.HeaderKeyStatus: {
-						Values: []string{strconv.Itoa(http.StatusBadGateway)},
-					},
-				}
-				respOpen := &protocolpb.Envelope{
-					Payload: &protocolpb.Envelope_StreamOpen{
-						StreamOpen: &protocolpb.StreamOpen{
-							Id:          streamID,
-							ServiceName: so.ServiceName,
-							TargetAddr:  so.TargetAddr,
-							Header:      respHeader,
-						},
-					},
-				}
-				if err2 := sendEnv(respOpen); err2 != nil {
-					logReq.Error("failed to send error stream_open from client", logging.Fields{
-						"error": err2.Error(),
-					})
-					return
-				}
-
-				dataEnv := &protocolpb.Envelope{
-					Payload: &protocolpb.Envelope_StreamData{
-						StreamData: &protocolpb.StreamData{
-							Id:   streamID,
-							Seq:  0,
-							Data: []byte("HopGate client: " + errMsg),
-						},
-					},
-				}
-				if err2 := sendEnv(dataEnv); err2 != nil {
-					logReq.Error("failed to send error stream_data from client", logging.Fields{
-						"error": err2.Error(),
-					})
-					return
-				}
-
-				closeEnv := &protocolpb.Envelope{
-					Payload: &protocolpb.Envelope_StreamClose{
-						StreamClose: &protocolpb.StreamClose{
-							Id:    streamID,
-							Error: errMsg,
-						},
-					},
-				}
-				if err2 := sendEnv(closeEnv); err2 != nil {
-					logReq.Error("failed to send error stream_close from client", logging.Fields{
-						"error": err2.Error(),
-					})
-				}
-				return
-			}
-			defer res.Body.Close()
-
-			// 응답 헤더 맵을 복사하고 상태 코드를 pseudo-header 로 추가합니다. (ko)
-			// Copy response headers and attach status code as a pseudo-header. (en)
-			respHeader := make(map[string]*protocolpb.HeaderValues, len(res.Header)+1)
-			for k, vs := range res.Header {
-				hv := &protocolpb.HeaderValues{
-					Values: append([]string(nil), vs...),
-				}
-				respHeader[k] = hv
-			}
-			statusCode := res.StatusCode
-			if statusCode == 0 {
-				statusCode = http.StatusOK
-			}
-			respHeader[protocol.HeaderKeyStatus] = &protocolpb.HeaderValues{
-				Values: []string{strconv.Itoa(statusCode)},
-			}
-
-			respOpen := &protocolpb.Envelope{
-				Payload: &protocolpb.Envelope_StreamOpen{
-					StreamOpen: &protocolpb.StreamOpen{
-						Id:          streamID,
-						ServiceName: so.ServiceName,
-						TargetAddr:  so.TargetAddr,
-						Header:      respHeader,
-					},
-				},
-			}
-			if err := sendEnv(respOpen); err != nil {
-				logReq.Error("failed to send stream response open envelope from client", logging.Fields{
-					"error": err.Error(),
-				})
-				return
-			}
-
-			// 응답 바디를 4KiB(StreamChunkSize) 단위로 잘라 StreamData 프레임으로 전송합니다. (ko)
-			// Chunk the response body into 4KiB (StreamChunkSize) StreamData frames. (en)
-			buf := make([]byte, protocol.StreamChunkSize)
-			var seq uint64
-			for {
-				n, err := res.Body.Read(buf)
-				if n > 0 {
-					dataCopy := append([]byte(nil), buf[:n]...)
-					dataEnv := &protocolpb.Envelope{
-						Payload: &protocolpb.Envelope_StreamData{
-							StreamData: &protocolpb.StreamData{
-								Id:   streamID,
-								Seq:  seq,
-								Data: dataCopy,
-							},
-						},
-					}
-					if err2 := sendEnv(dataEnv); err2 != nil {
-						logReq.Error("failed to send stream response data envelope from client", logging.Fields{
-							"error": err2.Error(),
-						})
-						return
-					}
-					seq++
-				}
-				if err == io.EOF {
-					break
-				}
-				if err != nil {
-					logReq.Error("failed to read local http response body", logging.Fields{
-						"error": err.Error(),
-					})
-					break
-				}
-			}
-
-			closeEnv := &protocolpb.Envelope{
-				Payload: &protocolpb.Envelope_StreamClose{
-					StreamClose: &protocolpb.StreamClose{
-						Id:    streamID,
-						Error: "",
-					},
-				},
-			}
-			if err := sendEnv(closeEnv); err != nil {
-				logReq.Error("failed to send stream response close envelope from client", logging.Fields{
-					"error": err.Error(),
-				})
-				return
-			}
-
-			logReq.Info("stream http response sent from client", logging.Fields{
-				"status":     statusCode,
-				"elapsed_ms": time.Since(start).Milliseconds(),
-				"error":      "",
-			})
-		}()
-	}
-
-	// 수신 루프: 서버에서 들어오는 StreamOpen/StreamData/StreamClose 를
-	// 로컬 HTTP 요청으로 변환하고 응답을 다시 터널로 전송합니다. (ko)
-	// Receive loop: convert incoming StreamOpen/StreamData/StreamClose into local
-	// HTTP requests and send responses back over the tunnel. (en)
-	for {
-		if ctx.Err() != nil {
-			log.Info("context cancelled, closing grpc tunnel client", logging.Fields{
-				"error": ctx.Err().Error(),
-			})
-			return ctx.Err()
-		}
-
-		in, err := stream.Recv()
-		if err != nil {
-			if err == io.EOF {
-				log.Info("grpc tunnel stream closed by server", nil)
-				return nil
-			}
-			log.Error("grpc tunnel receive error", logging.Fields{
-				"error": err.Error(),
-			})
-			return err
-		}
-
-		payloadType := "unknown"
-		switch payload := in.Payload.(type) {
-		case *protocolpb.Envelope_HttpRequest:
-			payloadType = "http_request"
-		case *protocolpb.Envelope_HttpResponse:
-			payloadType = "http_response"
-		case *protocolpb.Envelope_StreamOpen:
-			payloadType = "stream_open"
-
-			so := payload.StreamOpen
-			if so == nil {
-				log.Error("received stream_open with nil payload on grpc tunnel client", logging.Fields{})
-				continue
-			}
-			streamID := strings.TrimSpace(so.Id)
-			if streamID == "" {
-				log.Error("received stream_open with empty stream id on grpc tunnel client", logging.Fields{})
-				continue
-			}
-
-			streamsMu.Lock()
-			if _, exists := streams[streamID]; exists {
-				log.Error("received duplicate stream_open for existing stream on grpc tunnel client", logging.Fields{
-					"stream_id": streamID,
-				})
-				streamsMu.Unlock()
-				continue
-			}
-			streams[streamID] = &inboundStream{open: so}
-			streamsMu.Unlock()
-
-		case *protocolpb.Envelope_StreamData:
-			payloadType = "stream_data"
-
-			sd := payload.StreamData
-			if sd == nil {
-				log.Error("received stream_data with nil payload on grpc tunnel client", logging.Fields{})
-				continue
-			}
-			streamID := strings.TrimSpace(sd.Id)
-			if streamID == "" {
-				log.Error("received stream_data with empty stream id on grpc tunnel client", logging.Fields{})
-				continue
-			}
-
-			streamsMu.Lock()
-			st := streams[streamID]
-			streamsMu.Unlock()
-			if st == nil {
-				log.Warn("received stream_data for unknown stream on grpc tunnel client", logging.Fields{
-					"stream_id": streamID,
-				})
-				continue
-			}
-			if len(sd.Data) > 0 {
-				if _, err := st.body.Write(sd.Data); err != nil {
-					log.Error("failed to buffer stream_data body on grpc tunnel client", logging.Fields{
-						"stream_id": streamID,
-						"error":     err.Error(),
-					})
-				}
-			}
-
-		case *protocolpb.Envelope_StreamClose:
-			payloadType = "stream_close"
-
-			sc := payload.StreamClose
-			if sc == nil {
-				log.Error("received stream_close with nil payload on grpc tunnel client", logging.Fields{})
-				continue
-			}
-			streamID := strings.TrimSpace(sc.Id)
-			if streamID == "" {
-				log.Error("received stream_close with empty stream id on grpc tunnel client", logging.Fields{})
-				continue
-			}
-
-			streamsMu.Lock()
-			st := streams[streamID]
-			if st != nil {
-				delete(streams, streamID)
-			}
-			streamsMu.Unlock()
-			if st == nil {
-				log.Warn("received stream_close for unknown stream on grpc tunnel client", logging.Fields{
-					"stream_id": streamID,
-				})
-				continue
-			}
-
-			// 현재까지 수신한 메타데이터/바디를 사용해 로컬 HTTP 요청을 수행하고,
-			// 응답을 다시 터널로 전송합니다. (ko)
-			// Use the accumulated metadata/body to perform the local HTTP request and
-			// send the response back over the tunnel. (en)
-			bodyCopy := append([]byte(nil), st.body.Bytes()...)
-			handleStream(st.open, bodyCopy)
-
-		case *protocolpb.Envelope_StreamAck:
-			payloadType = "stream_ack"
-			// 현재 gRPC 터널에서는 StreamAck 를 사용하지 않습니다. (ko)
-			// StreamAck is currently unused for gRPC tunnels. (en)
-
-		default:
-			payloadType = fmt.Sprintf("unknown(%T)", in.Payload)
-		}
-
-		log.Info("received envelope on grpc tunnel client", logging.Fields{
-			"payload_type": payloadType,
-		})
-	}
-}
-
 func main() {
 	logger := logging.NewStdJSONLogger("client")
-
-	// 1. 환경변수(.env 포함)에서 클라이언트 설정 로드
-	// internal/config 패키지가 .env 를 먼저 읽고, 이미 설정된 OS 환경변수를 우선시합니다.
 	envCfg, err := config.LoadClientConfigFromEnv()
 	if err != nil {
-		logger.Error("failed to load client config from env", logging.Fields{
+		logger.Error("failed to load client config from env", logging.Fields{"error": err.Error()})
-			"error": err.Error(),
-		})
 		os.Exit(1)
 	}
 
-	// 2. 필수 환경 변수 유효성 검사 (.env 포함; OS 환경변수가 우선)
 	serverAddrEnv := getEnvOrPanic(logger, "HOP_CLIENT_SERVER_ADDR")
-	clientDomainEnv := getEnvOrPanic(logger, "HOP_CLIENT_DOMAIN")
+	domainEnv := getEnvOrPanic(logger, "HOP_CLIENT_DOMAIN")
 	apiKeyEnv := getEnvOrPanic(logger, "HOP_CLIENT_API_KEY")
 	localTargetEnv := getEnvOrPanic(logger, "HOP_CLIENT_LOCAL_TARGET")
 	debugEnv := getEnvOrPanic(logger, "HOP_CLIENT_DEBUG")
-
-	// 디버깅 플래그 형식 확인
 	if debugEnv != "true" && debugEnv != "false" {
-		logger.Error("invalid value for HOP_CLIENT_DEBUG; must be 'true' or 'false'", logging.Fields{
+		logger.Error("invalid value for HOP_CLIENT_DEBUG; must be 'true' or 'false'", logging.Fields{"value": debugEnv})
-			"env":   "HOP_CLIENT_DEBUG",
-			"value": debugEnv,
-		})
 		os.Exit(1)
 	}
 
-	// 유효성 검사 결과를 구조화 로그로 출력
+	serverAddrFlag := flag.String("server-addr", "", "HopGate yamux server address (host:port)")
-	logger.Info("validated client env vars", logging.Fields{
+	domainFlag := flag.String("domain", "", "registered domain")
-		"HOP_CLIENT_SERVER_ADDR":  serverAddrEnv,
+	apiKeyFlag := flag.String("api-key", "", "client API key for the domain")
-		"HOP_CLIENT_DOMAIN":       clientDomainEnv,
+	localTargetFlag := flag.String("local-target", "", "local HTTP target (host:port)")
-		"HOP_CLIENT_API_KEY_MASK": maskAPIKey(apiKeyEnv),
-		"HOP_CLIENT_LOCAL_TARGET": localTargetEnv,
-		"HOP_CLIENT_DEBUG":        debugEnv,
-	})
-
-	// CLI 인자 정의 (env 보다 우선 적용됨)
-	serverAddrFlag := flag.String("server-addr", "", "HopGate server address (host:port)")
-	domainFlag := flag.String("domain", "", "registered domain (e.g. api.example.com)")
-	apiKeyFlag := flag.String("api-key", "", "client API key for the domain (64 chars)")
-	localTargetFlag := flag.String("local-target", "", "local HTTP target (host:port), e.g. 127.0.0.1:8080")
-
 	flag.Parse()
 
-	// 2. CLI 인자 우선, env 후순위로 최종 설정 구성
 	finalCfg := &config.ClientConfig{
-		ServerAddr:   firstNonEmpty(strings.TrimSpace(*serverAddrFlag), strings.TrimSpace(envCfg.ServerAddr)),
+		ServerAddr:   firstNonEmpty(*serverAddrFlag, envCfg.ServerAddr),
-		Domain:       firstNonEmpty(strings.TrimSpace(*domainFlag), strings.TrimSpace(envCfg.Domain)),
+		Domain:       firstNonEmpty(*domainFlag, envCfg.Domain),
-		ClientAPIKey: firstNonEmpty(strings.TrimSpace(*apiKeyFlag), strings.TrimSpace(envCfg.ClientAPIKey)),
+		ClientAPIKey: firstNonEmpty(*apiKeyFlag, envCfg.ClientAPIKey),
-		LocalTarget:  firstNonEmpty(strings.TrimSpace(*localTargetFlag), strings.TrimSpace(envCfg.LocalTarget)),
+		LocalTarget:  firstNonEmpty(*localTargetFlag, envCfg.LocalTarget),
 		Debug:        envCfg.Debug,
 		Logging:      envCfg.Logging,
 	}
-
+	if finalCfg.ServerAddr == "" || finalCfg.Domain == "" || finalCfg.ClientAPIKey == "" || finalCfg.LocalTarget == "" {
-	// 3. 필수 필드 검증
+		logger.Error("client config is incomplete", logging.Fields{
-	missing := []string{}
+			"server_addr":  finalCfg.ServerAddr != "",
-	if finalCfg.ServerAddr == "" {
+			"domain":       finalCfg.Domain != "",
-		missing = append(missing, "server_addr")
+			"api_key":      finalCfg.ClientAPIKey != "",
-	}
+			"local_target": finalCfg.LocalTarget != "",
-	if finalCfg.Domain == "" {
-		missing = append(missing, "domain")
-	}
-	if finalCfg.ClientAPIKey == "" {
-		missing = append(missing, "api_key")
-	}
-	if finalCfg.LocalTarget == "" {
-		missing = append(missing, "local_target")
-	}
-
-	if len(missing) > 0 {
-		logger.Error("client config missing required fields", logging.Fields{
-			"missing": missing,
 		})
 		os.Exit(1)
 	}
 
-	logger.Info("hop-gate client starting", logging.Fields{
+	logger.Info("hop-gate yamux client starting", logging.Fields{
-		"stack":                 "prometheus-loki-grafana",
+		"version":             version,
-		"version":               version,
+		"server_addr":         serverAddrEnv,
-		"server_addr":           finalCfg.ServerAddr,
+		"domain":              domainEnv,
-		"domain":                finalCfg.Domain,
+		"client_api_key_mask": maskAPIKey(apiKeyEnv),
-		"local_target":          finalCfg.LocalTarget,
+		"local_target":        localTargetEnv,
-		"client_api_key_masked": maskAPIKey(finalCfg.ClientAPIKey),
+		"debug":               finalCfg.Debug,
-		"debug":                 finalCfg.Debug,
 	})
 
-	ctx := context.Background()
+	if err := runYamuxTunnelClient(context.Background(), logger, finalCfg); err != nil {
-
+		logger.Error("yamux tunnel client exited with error", logging.Fields{"error": err.Error()})
-	// 현재 클라이언트는 DTLS 레이어 없이 gRPC 터널만을 사용합니다. (ko)
-	// The client now uses only the gRPC tunnel, without any DTLS layer. (en)
-	if err := runGRPCTunnelClient(ctx, logger, finalCfg); err != nil {
-		logger.Error("grpc tunnel client exited with error", logging.Fields{
-			"error": err.Error(),
-		})
 		os.Exit(1)
 	}
-
-	logger.Info("grpc tunnel client exited normally", nil)
 }

cmd/client/yamux_tunnel.go

@@ -0,0 +1,177 @@
+package main
+
+import (
+	"bufio"
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/dalbodeule/hop-gate/internal/config"
+	"github.com/dalbodeule/hop-gate/internal/logging"
+	"github.com/dalbodeule/hop-gate/internal/tunnel"
+	"github.com/gorilla/websocket"
+)
+
+func runYamuxTunnelClient(ctx context.Context, logger logging.Logger, cfg *config.ClientConfig) error {
+	host := cfg.ServerAddr
+	if h, _, err := net.SplitHostPort(cfg.ServerAddr); err == nil {
+		host = h
+	}
+	tlsConfig := &tls.Config{ServerName: host, MinVersion: tls.VersionTLS12}
+	if cfg.Debug {
+		tlsConfig.InsecureSkipVerify = true
+	} else if roots, err := x509.SystemCertPool(); err == nil {
+		tlsConfig.RootCAs = roots
+	}
+
+	session, err := tunnel.DialTLS(ctx, cfg.ServerAddr, tlsConfig)
+	if err != nil {
+		return err
+	}
+	defer session.Close()
+
+	control, err := session.Open(ctx, tunnel.StreamMeta{
+		Kind:   "control",
+		Domain: cfg.Domain,
+		Target: cfg.LocalTarget,
+		Headers: map[string][]string{
+			"X-HopGate-API-Key": {cfg.ClientAPIKey},
+		},
+	})
+	if err != nil {
+		return fmt.Errorf("open yamux control stream: %w", err)
+	}
+	_ = control.Close()
+
+	localBase, err := url.Parse("http://" + cfg.LocalTarget)
+	if err != nil {
+		return fmt.Errorf("parse local target: %w", err)
+	}
+	client := &http.Client{Timeout: 0, Transport: &http.Transport{
+		DialContext:       (&net.Dialer{Timeout: 10 * time.Second, KeepAlive: 30 * time.Second}).DialContext,
+		ForceAttemptHTTP2: true,
+	}}
+	logger.Info("yamux tunnel client connected", logging.Fields{"server_addr": cfg.ServerAddr, "domain": cfg.Domain})
+
+	for {
+		stream, err := session.Accept(ctx)
+		if err != nil {
+			return err
+		}
+		go handleYamuxHTTPStream(ctx, stream, client, localBase, logger)
+	}
+}
+
+func handleYamuxHTTPStream(ctx context.Context, stream *tunnel.Stream, client *http.Client, localBase *url.URL, logger logging.Logger) {
+	defer stream.Close()
+	if stream.Meta.Kind == "websocket" {
+		handleYamuxWebSocketStream(ctx, stream, localBase, logger)
+		return
+	}
+	if stream.Meta.Kind != "http" {
+		logger.Warn("unsupported yamux stream kind", logging.Fields{"kind": stream.Meta.Kind})
+		return
+	}
+	request, err := http.ReadRequest(bufio.NewReader(stream))
+	if err != nil {
+		logger.Warn("read HTTP request from yamux stream failed", logging.Fields{"error": err.Error()})
+		return
+	}
+	request.URL.Scheme = localBase.Scheme
+	request.URL.Host = localBase.Host
+	request.RequestURI = ""
+	response, err := client.Do(request)
+	if err != nil {
+		logger.Warn("forward HTTP request to local target failed", logging.Fields{"error": err.Error()})
+		failure := &http.Response{
+			StatusCode: http.StatusBadGateway,
+			Status:     "502 Bad Gateway",
+			ProtoMajor: 1,
+			ProtoMinor: 1,
+			Header:     http.Header{"Content-Type": []string{"text/plain; charset=utf-8"}},
+			Body:       http.NoBody,
+			Request:    request,
+		}
+		if writeErr := failure.Write(stream); writeErr != nil {
+			logger.Warn("write local HTTP failure to yamux stream failed", logging.Fields{"error": writeErr.Error()})
+		}
+		return
+	}
+	defer response.Body.Close()
+	if err := writeHTTPResponse(stream, response); err != nil {
+		logger.Warn("write local HTTP response to yamux stream failed", logging.Fields{"error": err.Error()})
+	}
+}
+
+func writeHTTPResponse(stream io.Writer, response *http.Response) error {
+	return response.Write(stream)
+}
+
+func handleYamuxWebSocketStream(ctx context.Context, stream *tunnel.Stream, localBase *url.URL, logger logging.Logger) {
+	request, err := http.ReadRequest(bufio.NewReader(stream))
+	if err != nil {
+		logger.Warn("read WebSocket request from yamux stream failed", logging.Fields{"error": err.Error()})
+		return
+	}
+	request.URL.Scheme = "ws"
+	request.URL.Host = localBase.Host
+	request.RequestURI = ""
+
+	header := make(http.Header)
+	var subprotocols []string
+	for key, values := range request.Header {
+		switch http.CanonicalHeaderKey(key) {
+		case "Connection", "Upgrade", "Sec-Websocket-Key", "Sec-Websocket-Version", "Sec-Websocket-Extensions":
+			continue
+		case "Sec-Websocket-Protocol":
+			for _, value := range values {
+				for _, protocol := range strings.Split(value, ",") {
+					if strings.TrimSpace(protocol) != "" {
+						subprotocols = append(subprotocols, strings.TrimSpace(protocol))
+					}
+				}
+			}
+		default:
+			header[key] = append([]string(nil), values...)
+		}
+	}
+	dialer := websocket.Dialer{Subprotocols: subprotocols, HandshakeTimeout: 10 * time.Second}
+	backend, response, err := dialer.DialContext(ctx, request.URL.String(), header)
+	if err != nil {
+		logger.Warn("dial local WebSocket failed", logging.Fields{"error": err.Error()})
+		failure := &http.Response{
+			StatusCode: http.StatusBadGateway,
+			Status:     "502 Bad Gateway",
+			ProtoMajor: 1,
+			ProtoMinor: 1,
+			Header:     http.Header{"Content-Type": []string{"text/plain; charset=utf-8"}},
+			Body:       http.NoBody,
+		}
+		_ = failure.Write(stream)
+		return
+	}
+	defer backend.Close()
+	if err := response.Write(stream); err != nil {
+		logger.Warn("write WebSocket handshake to server failed", logging.Fields{"error": err.Error()})
+		return
+	}
+
+	backendConn := backend.UnderlyingConn()
+	result := make(chan error, 2)
+	go func() {
+		_, err := io.Copy(stream, backendConn)
+		result <- err
+	}()
+	go func() {
+		_, err := io.Copy(backendConn, stream)
+		result <- err
+	}()
+	<-result
+}

cmd/server/streaming_test.go

@@ -0,0 +1,130 @@
+package main
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/dalbodeule/hop-gate/internal/logging"
+)
+
+type noopLogger struct{}
+
+func (noopLogger) Debug(string, logging.Fields)         {}
+func (noopLogger) Info(string, logging.Fields)          {}
+func (noopLogger) Warn(string, logging.Fields)          {}
+func (noopLogger) Error(string, logging.Fields)         {}
+func (l noopLogger) With(logging.Fields) logging.Logger { return l }
+
+type streamingTestTunnel struct {
+	forwardHTTPCalled     bool
+	extendedConnectCalled bool
+	deadlineSeen          bool
+}
+
+func (t *streamingTestTunnel) ForwardHTTP(ctx context.Context, _ logging.Logger, _ *http.Request, _ string, w http.ResponseWriter) error {
+	t.forwardHTTPCalled = true
+	_, t.deadlineSeen = ctx.Deadline()
+	w.Header().Set("Content-Type", "text/event-stream")
+	w.WriteHeader(http.StatusOK)
+	_, err := w.Write([]byte("data: ready\n\n"))
+	return err
+}
+
+func (t *streamingTestTunnel) ForwardExtendedConnect(_ context.Context, _ logging.Logger, _ *http.Request, _ string, w http.ResponseWriter) error {
+	t.extendedConnectCalled = true
+	w.WriteHeader(http.StatusOK)
+	return nil
+}
+
+func TestSSERequestStreamsWithoutProxyTimeout(t *testing.T) {
+	tunnel := &streamingTestTunnel{}
+	logger := noopLogger{}
+	domain := "sse-test.example"
+	registerTunnelForDomain(domain, tunnel, logger)
+	defer unregisterTunnelForDomain(domain, tunnel, logger)
+
+	req := httptest.NewRequest(http.MethodGet, "http://"+domain+"/events", nil)
+	req.Host = domain
+	req.Header.Set("Accept", "text/event-stream")
+	recorder := httptest.NewRecorder()
+
+	newHTTPHandler(logger, time.Nanosecond).ServeHTTP(recorder, req)
+
+	if !tunnel.forwardHTTPCalled {
+		t.Fatal("expected SSE request to use HTTP forwarder")
+	}
+	if tunnel.deadlineSeen {
+		t.Fatal("expected SSE request to avoid the normal proxy timeout")
+	}
+	if got := recorder.Header().Get("Content-Type"); got != "text/event-stream" {
+		t.Fatalf("Content-Type = %q, want text/event-stream", got)
+	}
+	if got := recorder.Body.String(); got != "data: ready\n\n" {
+		t.Fatalf("body = %q, want SSE event", got)
+	}
+}
+
+func TestHTTP2ExtendedConnectUsesDedicatedForwarder(t *testing.T) {
+	tunnel := &streamingTestTunnel{}
+	logger := noopLogger{}
+	domain := "h2-connect-test.example"
+	registerTunnelForDomain(domain, tunnel, logger)
+	defer unregisterTunnelForDomain(domain, tunnel, logger)
+
+	req := httptest.NewRequest(http.MethodConnect, "https://"+domain+"/socket", nil)
+	req.Host = domain
+	req.ProtoMajor = 2
+	req.ProtoMinor = 0
+	req.Proto = "websocket"
+	recorder := httptest.NewRecorder()
+
+	newHTTPHandler(logger, time.Second).ServeHTTP(recorder, req)
+
+	if !tunnel.extendedConnectCalled {
+		t.Fatal("expected HTTP/2 Extended CONNECT forwarder to be called")
+	}
+	if tunnel.forwardHTTPCalled {
+		t.Fatal("did not expect regular HTTP forwarder for Extended CONNECT")
+	}
+	if got := recorder.Code; got != http.StatusOK {
+		t.Fatalf("status = %d, want %d", got, http.StatusOK)
+	}
+}
+
+func TestHTTP3ExtendedConnectDetection(t *testing.T) {
+	req := httptest.NewRequest(http.MethodConnect, "https://h3.example/socket", nil)
+	req.ProtoMajor = 3
+	req.ProtoMinor = 0
+	req.Proto = "websocket"
+
+	if !isExtendedConnectWebSocketRequest(req) {
+		t.Fatal("expected HTTP/3 Extended CONNECT WebSocket request to be detected")
+	}
+}
+
+func TestHTTP3SSERequestUsesStreamingPolicy(t *testing.T) {
+	tunnel := &streamingTestTunnel{}
+	logger := noopLogger{}
+	domain := "h3-sse-test.example"
+	registerTunnelForDomain(domain, tunnel, logger)
+	defer unregisterTunnelForDomain(domain, tunnel, logger)
+
+	req := httptest.NewRequest(http.MethodGet, "https://"+domain+"/events", nil)
+	req.Host = domain
+	req.ProtoMajor = 3
+	req.ProtoMinor = 0
+	req.Header.Set("Accept", "text/event-stream")
+	recorder := httptest.NewRecorder()
+
+	newHTTPHandler(logger, time.Nanosecond).ServeHTTP(recorder, req)
+
+	if tunnel.deadlineSeen {
+		t.Fatal("expected HTTP/3 SSE request to avoid the normal proxy timeout")
+	}
+	if got := recorder.Body.String(); got != "data: ready\n\n" {
+		t.Fatalf("body = %q, want SSE event", got)
+	}
+}

cmd/server/yamux_tunnel.go

@@ -0,0 +1,300 @@
+package main
+
+import (
+	"bufio"
+	"context"
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/dalbodeule/hop-gate/internal/logging"
+	"github.com/dalbodeule/hop-gate/internal/tunnel"
+)
+
+type yamuxTunnelSession struct {
+	session *tunnel.Session
+	logger  logging.Logger
+}
+
+func (t *yamuxTunnelSession) ForwardHTTP(ctx context.Context, logger logging.Logger, req *http.Request, serviceName string, w http.ResponseWriter) error {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	meta := tunnel.StreamMeta{
+		Kind:    "http",
+		Service: serviceName,
+		Method:  req.Method,
+		Path:    req.URL.RequestURI(),
+		Host:    req.Host,
+		Headers: req.Header,
+	}
+	stream, err := t.session.Open(ctx, meta)
+	if err != nil {
+		return err
+	}
+	defer stream.Close()
+	if deadline, ok := ctx.Deadline(); ok {
+		_ = stream.SetDeadline(deadline)
+	}
+
+	request := req.Clone(ctx)
+	request.RequestURI = ""
+	if err := request.Write(stream); err != nil {
+		return fmt.Errorf("write HTTP request to yamux stream: %w", err)
+	}
+	resp, err := http.ReadResponse(bufio.NewReader(stream), req)
+	if err != nil {
+		return fmt.Errorf("read HTTP response from yamux stream: %w", err)
+	}
+	defer resp.Body.Close()
+	for key, values := range resp.Header {
+		if _, owned := hopGateOwnedHeaders[http.CanonicalHeaderKey(key)]; owned {
+			continue
+		}
+		for _, value := range values {
+			w.Header().Add(key, value)
+		}
+	}
+	w.WriteHeader(resp.StatusCode)
+	if _, err := io.Copy(flushingResponseWriter{ResponseWriter: w}, resp.Body); err != nil {
+		return fmt.Errorf("stream HTTP response body from yamux: %w", err)
+	}
+	return nil
+}
+
+type websocketForwarder interface {
+	ForwardWebSocket(context.Context, logging.Logger, *http.Request, string, http.ResponseWriter) error
+}
+
+func isWebSocketRequest(r *http.Request) bool {
+	return strings.EqualFold(r.Header.Get("Upgrade"), "websocket") &&
+		strings.Contains(strings.ToLower(r.Header.Get("Connection")), "upgrade")
+}
+
+func isExtendedConnectWebSocketRequest(r *http.Request) bool {
+	return r.ProtoMajor >= 2 && r.Method == http.MethodConnect &&
+		strings.EqualFold(r.Proto, "websocket")
+}
+
+func isSSERequest(r *http.Request) bool {
+	for _, value := range r.Header.Values("Accept") {
+		for _, mediaType := range strings.Split(value, ",") {
+			if strings.EqualFold(strings.TrimSpace(strings.SplitN(mediaType, ";", 2)[0]), "text/event-stream") {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func (t *yamuxTunnelSession) ForwardWebSocket(ctx context.Context, logger logging.Logger, req *http.Request, serviceName string, w http.ResponseWriter) error {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	if _, ok := w.(http.Hijacker); !ok {
+		return fmt.Errorf("websocket upgrade requires HTTP/1.1 hijacking")
+	}
+	stream, err := t.session.Open(ctx, tunnel.StreamMeta{
+		Kind:    "websocket",
+		Service: serviceName,
+		Method:  req.Method,
+		Path:    req.URL.RequestURI(),
+		Host:    req.Host,
+		Headers: req.Header,
+	})
+	if err != nil {
+		return err
+	}
+	defer stream.Close()
+	if deadline, ok := ctx.Deadline(); ok {
+		_ = stream.SetDeadline(deadline)
+	}
+	request := req.Clone(ctx)
+	request.RequestURI = ""
+	if err := request.Write(stream); err != nil {
+		return fmt.Errorf("write WebSocket request to yamux stream: %w", err)
+	}
+	backendReader := bufio.NewReader(stream)
+	backendResponse, err := http.ReadResponse(backendReader, req)
+	if err != nil {
+		return fmt.Errorf("read WebSocket handshake from yamux stream: %w", err)
+	}
+	if backendResponse.StatusCode != http.StatusSwitchingProtocols {
+		defer backendResponse.Body.Close()
+		w.WriteHeader(backendResponse.StatusCode)
+		_, _ = io.Copy(w, backendResponse.Body)
+		return fmt.Errorf("backend rejected WebSocket upgrade with status %d", backendResponse.StatusCode)
+	}
+
+	hijacker := w.(http.Hijacker)
+	clientConn, clientRW, err := hijacker.Hijack()
+	if err != nil {
+		return fmt.Errorf("hijack public WebSocket connection: %w", err)
+	}
+	defer clientConn.Close()
+	if err := backendResponse.Write(clientRW); err != nil {
+		return fmt.Errorf("write WebSocket handshake to public client: %w", err)
+	}
+	if err := clientRW.Flush(); err != nil {
+		return fmt.Errorf("flush WebSocket handshake: %w", err)
+	}
+
+	return relayConnections(clientRW.Reader, stream, clientConn, backendReader)
+}
+
+func (t *yamuxTunnelSession) ForwardExtendedConnect(ctx context.Context, logger logging.Logger, req *http.Request, serviceName string, w http.ResponseWriter) error {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	stream, err := t.session.Open(ctx, tunnel.StreamMeta{
+		Kind:    "websocket",
+		Service: serviceName,
+		Method:  req.Method,
+		Path:    req.URL.RequestURI(),
+		Host:    req.Host,
+		Headers: req.Header,
+	})
+	if err != nil {
+		return err
+	}
+	defer stream.Close()
+	if deadline, ok := ctx.Deadline(); ok {
+		_ = stream.SetDeadline(deadline)
+	}
+
+	request := req.Clone(ctx)
+	request.Method = http.MethodGet
+	request.RequestURI = ""
+	request.Body = http.NoBody
+	request.ContentLength = 0
+	request.Header = request.Header.Clone()
+	request.Header.Del(":protocol")
+	request.Header.Set("Connection", "Upgrade")
+	request.Header.Set("Upgrade", "websocket")
+	if err := request.Write(stream); err != nil {
+		return fmt.Errorf("write translated WebSocket request to yamux stream: %w", err)
+	}
+
+	backendReader := bufio.NewReader(stream)
+	backendResponse, err := http.ReadResponse(backendReader, request)
+	if err != nil {
+		return fmt.Errorf("read translated WebSocket handshake from yamux stream: %w", err)
+	}
+	defer backendResponse.Body.Close()
+	if backendResponse.StatusCode != http.StatusSwitchingProtocols {
+		w.WriteHeader(http.StatusBadGateway)
+		return fmt.Errorf("local WebSocket rejected Extended CONNECT with status %d", backendResponse.StatusCode)
+	}
+
+	for key, values := range backendResponse.Header {
+		if _, owned := hopGateOwnedHeaders[http.CanonicalHeaderKey(key)]; owned {
+			continue
+		}
+		for _, value := range values {
+			w.Header().Add(key, value)
+		}
+	}
+	w.WriteHeader(http.StatusOK)
+	if flusher, ok := w.(http.Flusher); ok {
+		flusher.Flush()
+	}
+	return relayConnections(req.Body, stream, flushingResponseWriter{ResponseWriter: w}, backendReader)
+}
+
+type flushingResponseWriter struct{ http.ResponseWriter }
+
+func (w flushingResponseWriter) Write(p []byte) (int, error) {
+	n, err := w.ResponseWriter.Write(p)
+	if flusher, ok := w.ResponseWriter.(http.Flusher); ok {
+		flusher.Flush()
+	}
+	return n, err
+}
+
+func relayConnections(clientReader io.Reader, stream io.Writer, clientWriter io.Writer, backend io.Reader) error {
+	result := make(chan error, 2)
+	go func() {
+		_, err := io.Copy(stream, clientReader)
+		result <- err
+	}()
+	go func() {
+		_, err := io.Copy(clientWriter, backend)
+		result <- err
+	}()
+	return <-result
+}
+
+func serveYamuxTunnel(ctx context.Context, address string, tlsConfig *tls.Config, logger logging.Logger, validator tunnel.DomainValidator) error {
+	listener, err := tls.Listen("tcp", address, tlsConfig)
+	if err != nil {
+		return fmt.Errorf("listen for yamux tunnel: %w", err)
+	}
+	defer listener.Close()
+	logger.Info("yamux tunnel listener started", logging.Fields{"addr": address})
+
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+			}
+			logger.Error("yamux tunnel accept failed", logging.Fields{"error": err.Error()})
+			continue
+		}
+		go handleYamuxTunnel(ctx, conn, logger, validator)
+	}
+}
+
+func handleYamuxTunnel(ctx context.Context, conn net.Conn, logger logging.Logger, validator tunnel.DomainValidator) {
+	session, err := tunnel.NewServer(conn)
+	if err != nil {
+		logger.Error("create yamux server session failed", logging.Fields{"error": err.Error()})
+		return
+	}
+	defer session.Close()
+
+	control, err := session.Accept(ctx)
+	if err != nil {
+		logger.Error("accept yamux control stream failed", logging.Fields{"error": err.Error()})
+		return
+	}
+	defer control.Close()
+	if control.Meta.Kind != "control" || strings.TrimSpace(control.Meta.Domain) == "" || strings.TrimSpace(control.Meta.Target) == "" {
+		logger.Warn("invalid yamux control metadata", logging.Fields{"kind": control.Meta.Kind})
+		return
+	}
+	apiKeys := control.Meta.Headers["X-HopGate-API-Key"]
+	if len(apiKeys) == 0 || strings.TrimSpace(apiKeys[0]) == "" {
+		logger.Warn("yamux control stream missing API key", logging.Fields{"domain": control.Meta.Domain})
+		return
+	}
+	if validator != nil {
+		if err := validator.ValidateDomainAPIKey(ctx, control.Meta.Domain, apiKeys[0]); err != nil {
+			logger.Warn("yamux tunnel authentication failed", logging.Fields{"domain": control.Meta.Domain, "error": err.Error()})
+			return
+		}
+	}
+
+	tunnelSession := &yamuxTunnelSession{session: session, logger: logger.With(logging.Fields{"domain": control.Meta.Domain})}
+	domain := registerTunnelForDomain(control.Meta.Domain, tunnelSession, logger)
+	defer unregisterTunnelForDomain(domain, tunnelSession, logger)
+	logger.Info("yamux tunnel authenticated", logging.Fields{"domain": domain, "local_target": control.Meta.Target})
+
+	// The server opens HTTP streams. The client opens only the control stream,
+	// so poll the session state rather than consuming the server's own streams.
+	ticker := time.NewTicker(time.Second)
+	defer ticker.Stop()
+	for !session.IsClosed() {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+		}
+	}
+}

go.mod

@@ -1,16 +1,16 @@
 module github.com/dalbodeule/hop-gate
 
-go 1.25.4
+go 1.27.0
 
 require (
 	entgo.io/ent v0.14.5
 	github.com/go-acme/lego/v4 v4.28.1
 	github.com/google/uuid v1.6.0
+	github.com/gorilla/websocket v1.5.3
+	github.com/hashicorp/yamux v0.1.2
 	github.com/lib/pq v1.10.9
 	github.com/prometheus/client_golang v1.19.0
-	golang.org/x/net v0.47.0
+	github.com/quic-go/quic-go v0.62.0
-	google.golang.org/grpc v1.76.0
-	google.golang.org/protobuf v1.36.10
 )
 
 require (
@@ -30,14 +30,16 @@ require (
 	github.com/prometheus/client_model v0.5.0 // indirect
 	github.com/prometheus/common v0.48.0 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/quic-go/qpack v0.6.0 // indirect
 	github.com/rogpeppe/go-internal v1.14.1 // indirect
 	github.com/zclconf/go-cty v1.14.4 // indirect
 	github.com/zclconf/go-cty-yaml v1.1.0 // indirect
-	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/crypto v0.54.0 // indirect
-	golang.org/x/mod v0.29.0 // indirect
+	golang.org/x/mod v0.37.0 // indirect
-	golang.org/x/sync v0.18.0 // indirect
+	golang.org/x/net v0.56.0 // indirect
-	golang.org/x/sys v0.38.0 // indirect
+	golang.org/x/sync v0.22.0 // indirect
-	golang.org/x/text v0.31.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
-	golang.org/x/tools v0.38.0 // indirect
+	golang.org/x/text v0.40.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20251022142026-3a174f9686a8 // indirect
+	golang.org/x/tools v0.47.0 // indirect
+	google.golang.org/protobuf v1.36.10 // indirect
 )

go.sum

@@ -22,22 +22,20 @@ github.com/go-acme/lego/v4 v4.28.1 h1:zt301JYF51UIEkpSXsdeGq9hRePeFzQCq070OdAmP0
 github.com/go-acme/lego/v4 v4.28.1/go.mod h1:bzjilr03IgbaOwlH396hq5W56Bi0/uoRwW/JM8hP7m4=
 github.com/go-jose/go-jose/v4 v4.1.3 h1:CVLmWDhDVRa6Mi/IgCgaopNosCaHz7zrMeF9MlZRkrs=
 github.com/go-jose/go-jose/v4 v4.1.3/go.mod h1:x4oUasVrzR7071A4TnHLGSPpNOm2a21K9Kf04k1rs08=
-github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
-github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
-github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
-github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
 github.com/go-openapi/inflect v0.19.0 h1:9jCH9scKIbHeV9m12SmPilScz6krDxKRasNNSNPXu/4=
 github.com/go-openapi/inflect v0.19.0/go.mod h1:lHpZVlpIQqLyKwJ4N+YSc9hchQy/i12fJykb83CRBH4=
 github.com/go-test/deep v1.0.3 h1:ZrJSEWsXzPOxaZnFteGEfooLba+ju3FYIbOrS+rQd68=
 github.com/go-test/deep v1.0.3/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
-github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
-github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/hashicorp/hcl/v2 v2.18.1 h1:6nxnOJFku1EuSawSD81fuviYUV8DxFr3fp2dUi3ZYSo=
 github.com/hashicorp/hcl/v2 v2.18.1/go.mod h1:ThLC89FV4p9MPW804KVbe/cEXoQ8NZEh+JtMeeGErHE=
+github.com/hashicorp/yamux v0.1.2 h1:XtB8kyFOyHXYVFnwT5C3+Bdo8gArse7j2AQ0DA0Uey8=
+github.com/hashicorp/yamux v0.1.2/go.mod h1:C+zze2n6e/7wshOZep2A70/aQU6QBRWJO/G6FT1wIns=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -52,8 +50,6 @@ github.com/miekg/dns v1.1.68 h1:jsSRkNozw7G/mnmXULynzMNIsgY2dHC8LO6U6Ij2JEA=
 github.com/miekg/dns v1.1.68/go.mod h1:fujopn7TB3Pu3JM69XaawiU0wqjpL9/8xGop5UrTPps=
 github.com/mitchellh/go-wordwrap v1.0.1 h1:TLuKupo69TCn6TQSyGxwI1EblZZEsQ0vMlAFQflz0v0=
 github.com/mitchellh/go-wordwrap v1.0.1/go.mod h1:R62XHJLzvMFRBbcrT7m7WgmE1eOyTSsCt+hzestvNj0=
-github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
-github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_golang v1.19.0 h1:ygXvpU1AoN1MhdzckN+PyD9QJOSD4x7kmXYlnfbA6JU=
 github.com/prometheus/client_golang v1.19.0/go.mod h1:ZRM9uEAypZakd+q/x7+gmsvXdURP+DABIEIjnmDdp+k=
 github.com/prometheus/client_model v0.5.0 h1:VQw1hfvPvk3Uv6Qf29VrPF32JB6rtbgI6cYPYQjL0Qw=
@@ -62,49 +58,39 @@ github.com/prometheus/common v0.48.0 h1:QO8U2CdOzSn1BBsmXJXduaaW+dY/5QLjfB8svtSz
 github.com/prometheus/common v0.48.0/go.mod h1:0/KsvlIEfPQCQ5I2iNSAWKPZziNCvRs5EC6ILDTlAPc=
 github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k6Bo=
 github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
+github.com/quic-go/go-ossfuzz-seeds v0.1.0 h1:APacT+iIaNF6fd8AGEiN3bT/Jtkd2jz4v4TzM7MFjy0=
+github.com/quic-go/go-ossfuzz-seeds v0.1.0/go.mod h1:3IOHRbJIc+L6YKMwfDtJAM9Vj9k0YY4muhuyUYk5tbk=
+github.com/quic-go/qpack v0.6.0 h1:g7W+BMYynC1LbYLSqRt8PBg5Tgwxn214ZZR34VIOjz8=
+github.com/quic-go/qpack v0.6.0/go.mod h1:lUpLKChi8njB4ty2bFLX2x4gzDqXwUpaO1DP9qMDZII=
+github.com/quic-go/quic-go v0.62.0 h1:ZHDjCk5OacATwGvs8PWE97CTvX7AqZiVoW7++ZOXTf8=
+github.com/quic-go/quic-go v0.62.0/go.mod h1:RAro2j2yN9a9EiPACLHT9IB2NXCvGQmmo/alT0yYI0w=
 github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
 github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
 github.com/sergi/go-diff v1.3.1 h1:xkr+Oxo4BOQKmkn/B9eMK0g5Kg/983T9DqqPHwYqD+8=
 github.com/sergi/go-diff v1.3.1/go.mod h1:aMJSSKb2lpPvRNec0+w3fl7LP9IOFzdc9Pa4NFbPK1I=
-github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
+github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
-github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
 github.com/zclconf/go-cty v1.14.4 h1:uXXczd9QDGsgu0i/QFR/hzI5NYCHLf6NQw/atrbnhq8=
 github.com/zclconf/go-cty v1.14.4/go.mod h1:VvMs5i0vgZdhYawQNq5kePSpLAoz8u1xvZgrPIxfnZE=
 github.com/zclconf/go-cty-yaml v1.1.0 h1:nP+jp0qPHv2IhUVqmQSzjvqAWcObN0KBkUl2rWBdig0=
 github.com/zclconf/go-cty-yaml v1.1.0/go.mod h1:9YLUH4g7lOhVWqUbctnVlZ5KLpg7JAprQNgxSZ1Gyxs=
-go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
+go.uber.org/mock v0.5.2 h1:LbtPTcP8A5k9WPXj54PPPbjcI4Y6lhyOZXn+VS7wNko=
-go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
+go.uber.org/mock v0.5.2/go.mod h1:wLlUxC2vVTPTaE3UD51E0BGOAElKrILxhVSDYQLld5o=
-go.opentelemetry.io/otel v1.37.0 h1:9zhNfelUvx0KBfu/gb+ZgeAfAgtWrfHJZcAqFC228wQ=
+go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
-go.opentelemetry.io/otel v1.37.0/go.mod h1:ehE/umFRLnuLa/vSccNq9oS1ErUlkkK71gMcN34UG8I=
+go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
-go.opentelemetry.io/otel/metric v1.37.0 h1:mvwbQS5m0tbmqML4NqK+e3aDiO02vsf/WgbsdpcPoZE=
+golang.org/x/crypto v0.54.0 h1:YLIA59K4fiNzHzjnZt2tUJQjQtUWfWbeHBqKtk3eScw=
-go.opentelemetry.io/otel/metric v1.37.0/go.mod h1:04wGrZurHYKOc+RKeye86GwKiTb9FKm1WHtO+4EVr2E=
+golang.org/x/crypto v0.54.0/go.mod h1:KWL8ny2AZdGR2cWmzeHrp2azQPGogOv+HeQaVEXC2dk=
-go.opentelemetry.io/otel/sdk v1.37.0 h1:ItB0QUqnjesGRvNcmAcU0LyvkVyGJ2xftD29bWdDvKI=
+golang.org/x/mod v0.37.0 h1:vF1DjpVEshcIqoEaauuHebaLk1O1forxjxBaVn884JQ=
-go.opentelemetry.io/otel/sdk v1.37.0/go.mod h1:VredYzxUvuo2q3WRcDnKDjbdvmO0sCzOvVAiY+yUkAg=
+golang.org/x/mod v0.37.0/go.mod h1:m8S8VeM9r4dzDwjrKO0a1sZP3YjeMamRRlD+fmR2Q/0=
-go.opentelemetry.io/otel/sdk/metric v1.37.0 h1:90lI228XrB9jCMuSdA0673aubgRobVZFhbjxHHspCPc=
+golang.org/x/net v0.56.0 h1:Rw8j/hFzGvJUZwNBXnAtf5sVDVt+65SK2C7IxCxZt5o=
-go.opentelemetry.io/otel/sdk/metric v1.37.0/go.mod h1:cNen4ZWfiD37l5NhS+Keb5RXVWZWpRE+9WyVCpbo5ps=
+golang.org/x/net v0.56.0/go.mod h1:D3Ku6r+V6JROoZK144D2XfMHFcMq/0zSfLelVTCFKec=
-go.opentelemetry.io/otel/trace v1.37.0 h1:HLdcFNbRQBE2imdSEgm/kwqmQj1Or1l/7bW6mxVK7z4=
+golang.org/x/sync v0.22.0 h1:SZjpbeLmrCk4xhRSZFNZW5gFUeCeFgjekvI/+gfScek=
-go.opentelemetry.io/otel/trace v1.37.0/go.mod h1:TlgrlQ+PtQO5XFerSPUYG0JSgGyryXewPGyayAWSBS0=
+golang.org/x/sync v0.22.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
-golang.org/x/crypto v0.45.0 h1:jMBrvKuj23MTlT0bQEOBcAE0mjg8mK9RXFhRH6nyF3Q=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
-golang.org/x/crypto v0.45.0/go.mod h1:XTGrrkGJve7CYK7J8PEww4aY7gM3qMCElcJQ8n8JdX4=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
-golang.org/x/mod v0.29.0 h1:HV8lRxZC4l2cr3Zq1LvtOsi/ThTgWnUk/y64QSs8GwA=
+golang.org/x/text v0.40.0 h1:Ub2Z6/xjgF1WrYQz2nuITOEegKFtiIy+rieRJ5lHZKs=
-golang.org/x/mod v0.29.0/go.mod h1:NyhrlYXJ2H4eJiRy/WDBO6HMqZQ6q9nk4JzS3NuCK+w=
+golang.org/x/text v0.40.0/go.mod h1:hpnzDAfGV753zIKo+wk3u1bVKCGPbrnF7+7LBF/UHVY=
-golang.org/x/net v0.47.0 h1:Mx+4dIFzqraBXUugkia1OOvlD6LemFo1ALMHjrXDOhY=
+golang.org/x/tools v0.47.0 h1:7Kn5x/d1svx/PzryTsqeoZN4TZwqeH5pGWjefhLi/1Q=
-golang.org/x/net v0.47.0/go.mod h1:/jNxtkgq5yWUGYkaZGqo27cfGZ1c5Nen03aYrrKpVRU=
+golang.org/x/tools v0.47.0/go.mod h1:dFHnyTvFWY212G+h7ZY4Vsp/K3U4/7W9TyVaAul8uCA=
-golang.org/x/sync v0.18.0 h1:kr88TuHDroi+UVf+0hZnirlk8o8T+4MrK6mr60WkH/I=
-golang.org/x/sync v0.18.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
-golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc=
-golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
-golang.org/x/text v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM=
-golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM=
-golang.org/x/tools v0.38.0 h1:Hx2Xv8hISq8Lm16jvBZ2VQf+RLmbd7wVUsALibYI/IQ=
-golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=
-gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
-gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251022142026-3a174f9686a8 h1:M1rk8KBnUsBDg1oPGHNCxG4vc1f49epmTO7xscSajMk=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251022142026-3a174f9686a8/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
-google.golang.org/grpc v1.76.0 h1:UnVkv1+uMLYXoIz6o7chp59WfQUYA2ex/BXQ9rHZu7A=
-google.golang.org/grpc v1.76.0/go.mod h1:Ju12QI8M6iQJtbcsV+awF5a4hfJMLi4X0JLo94ULZ6c=
 google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
 google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/acme/acme.go

@@ -29,8 +29,8 @@ import (
 // Manager 는 ACME 기반 인증서 관리를 추상화합니다. (ko)
 // Manager abstracts ACME-based certificate management. (en)
 type Manager interface {
-	// TLSConfig 는 HTTPS 및 DTLS 서버에 주입할 tls.Config 를 반환합니다. (ko)
+	// TLSConfig 는 HTTPS 및 TLS 터널 listener에 주입할 tls.Config 를 반환합니다. (ko)
-	// TLSConfig returns a tls.Config to be used by HTTPS and DTLS servers. (en)
+	// TLSConfig returns a tls.Config for the HTTPS and TLS tunnel listeners. (en)
 	TLSConfig() *tls.Config
 }
 

internal/admin/domain_validator.go

@@ -8,8 +8,8 @@ import (
 
 	"github.com/dalbodeule/hop-gate/ent"
 	entdomain "github.com/dalbodeule/hop-gate/ent/domain"
-	"github.com/dalbodeule/hop-gate/internal/dtls"
 	"github.com/dalbodeule/hop-gate/internal/logging"
+	"github.com/dalbodeule/hop-gate/internal/tunnel"
 )
 
 // entDomainValidator 는 ent.Client 를 사용해 Domain 테이블에서
@@ -22,7 +22,7 @@ type entDomainValidator struct {
 // NewEntDomainValidator 는 ent 기반 DomainValidator 를 생성합니다.
 //   - domain 파라미터는 "host" 또는 "host:port" 형태 모두 허용하며,
 //     DB 조회 시에는 host 부분만 사용합니다.
-func NewEntDomainValidator(logger logging.Logger, client *ent.Client) dtls.DomainValidator {
+func NewEntDomainValidator(logger logging.Logger, client *ent.Client) tunnel.DomainValidator {
 	return &entDomainValidator{
 		logger: logger.With(logging.Fields{"component": "domain_validator"}),
 		client: client,

internal/config/config.go

@@ -30,7 +30,7 @@ type LokiConfig struct {
 type ServerConfig struct {
 	HTTPListen   string   // 예: ":80"
 	HTTPSListen  string   // 예: ":443"
-	DTLSListen   string   // 예: ":443"
+	TunnelListen string   // TLS + yamux tunnel listener, 예: ":7443"
 	Domain       string   // 메인 도메인
 	ProxyDomains []string // 프록시 서브도메인 또는 별도 도메인
 	Debug        bool     // true 이면 디버그 모드 (예: self-signed 인증서 신뢰, 검증 스킵 등)
@@ -40,7 +40,7 @@ type ServerConfig struct {
 
 // ClientConfig 는 클라이언트 프로세스 설정을 담습니다.
 // 현재 클라이언트는 다음 4가지 설정만 사용합니다.
-//   - ServerAddr   : DTLS 서버 주소 (host:port)
+//   - ServerAddr   : 터널 서버 주소 (host:port)
 //   - Domain       : 서버에서 등록된 도메인 (예: api.example.com)
 //   - ClientAPIKey : 도메인에 매핑된 64자 클라이언트 API Key
 //   - LocalTarget  : 로컬에서 요청할 서버 주소 (예: 127.0.0.1:8080)
@@ -48,7 +48,7 @@ type ServerConfig struct {
 // 값은 .env/환경변수와 CLI 인자를 조합해 구성하며,
 // CLI 인자가 우선, env 가 후순위로 적용됩니다.
 type ClientConfig struct {
-	ServerAddr   string // DTLS 서버 주소 (host:port)
+	ServerAddr   string // 터널 서버 주소 (host:port)
 	Domain       string // 서버에서 등록된 도메인 (예: api.example.com)
 	ClientAPIKey string // 도메인에 매핑된 64자 클라이언트 API Key
 	LocalTarget  string // 로컬에서 요청할 서버 주소 (예: 127.0.0.1:8080)
@@ -224,7 +224,7 @@ func LoadServerConfigFromEnv() (*ServerConfig, error) {
 	cfg := &ServerConfig{
 		HTTPListen:   getEnvOrDefault("HOP_SERVER_HTTP_LISTEN", ":80"),
 		HTTPSListen:  getEnvOrDefault("HOP_SERVER_HTTPS_LISTEN", ":443"),
-		DTLSListen:   getEnvOrDefault("HOP_SERVER_DTLS_LISTEN", ":443"),
+		TunnelListen: getEnvOrDefault("HOP_SERVER_TUNNEL_LISTEN", ":7443"),
 		Domain:       os.Getenv("HOP_SERVER_DOMAIN"),
 		ProxyDomains: parseCSVEnv("HOP_SERVER_PROXY_DOMAINS"),
 		Debug:        getEnvBool("HOP_SERVER_DEBUG", false),

internal/dtls/dtls.go

@@ -1,23 +0,0 @@
-package dtls
-
-import "io"
-
-// Session 은 DTLS 위의 양방향 스트림을 추상화합니다.
-type Session interface {
-	io.ReadWriteCloser
-	ID() string
-}
-
-// Server 는 다중 클라이언트 DTLS 세션을 관리하는 추상 인터페이스입니다.
-type Server interface {
-	Accept() (Session, error)
-	Close() error
-}
-
-// Client 는 단일 서버와의 DTLS 세션을 관리하는 추상 인터페이스입니다.
-type Client interface {
-	Connect() (Session, error)
-	Close() error
-}
-
-// 실제 구현은 향후 pion/dtls 등을 사용해 추가합니다.

internal/dtls/handshake.go

@@ -1,210 +0,0 @@
-package dtls
-
-import (
-	"bufio"
-	"context"
-	"encoding/json"
-	"fmt"
-	"strings"
-
-	"github.com/dalbodeule/hop-gate/internal/logging"
-)
-
-// DomainValidator 는 (domain, clientAPIKey) 조합이 유효한지 검증하는 인터페이스입니다.
-// 실제 구현에서는 ent + PostgreSQL 을 사용해 Domain 테이블을 조회하면 됩니다.
-type DomainValidator interface {
-	ValidateDomainAPIKey(ctx context.Context, domain, clientAPIKey string) error
-}
-
-// ServerHandshakeResult 는 서버 측에서 핸드셰이크가 완료된 후의 정보를 담습니다.
-type ServerHandshakeResult struct {
-	Domain string
-}
-
-// ClientHandshakeResult 는 클라이언트 측에서 핸드셰이크가 완료된 후의 정보를 담습니다.
-type ClientHandshakeResult struct {
-	Domain  string
-	Message string
-}
-
-// handshakeRequest 는 클라이언트가 최초 DTLS 연결 후 서버로 보내는 메시지입니다.
-// - Domain: 사용할 도메인 (예: api.example.com)
-// - ClientAPIKey: 관리 plane 을 통해 발급받은 64자 API Key
-type handshakeRequest struct {
-	Domain       string `json:"domain"`
-	ClientAPIKey string `json:"client_api_key"`
-}
-
-// handshakeResponse 는 서버가 핸드셰이크 결과를 클라이언트로 돌려줄 때 사용하는 메시지입니다.
-type handshakeResponse struct {
-	OK      bool   `json:"ok"`
-	Message string `json:"message"`
-	Domain  string `json:"domain"`
-}
-
-// PerformServerHandshake 는 서버 측에서 DTLS 세션이 생성된 직후 호출되어
-// 클라이언트가 보낸 (domain, client_api_key)를 검증합니다.
-//
-// 성공 시:
-//   - 서버 로그에 "어떤 도메인이 연결되었는지" 기록
-//   - 클라이언트로 OK 응답을 전송
-//   - ServerHandshakeResult 에 도메인 정보를 담아 반환
-func PerformServerHandshake(
-	ctx context.Context,
-	sess Session,
-	validator DomainValidator,
-	logger logging.Logger,
-) (*ServerHandshakeResult, error) {
-	log := logger.With(logging.Fields{"phase": "dtls_handshake", "side": "server"})
-
-	if err := ctx.Err(); err != nil {
-		return nil, err
-	}
-
-	var req handshakeRequest
-	// NOTE: pion/dtls 는 application plaintext 를 Caller's buffer 에 복호화하므로,
-	// JSON 디코더가 사용하는 버퍼 크기가 너무 작으면 "dtls: buffer too small" 이 발생할 수 있습니다.
-	// 이를 피하기 위해 충분히 큰 bufio.Reader(예: 64KiB)를 사용합니다. (ko)
-	// pion/dtls decrypts application data into the buffer provided by the caller.
-	// To avoid "dtls: buffer too small" errors when JSON payloads are larger than
-	// the default decoder buffer, we wrap the session in a bufio.Reader with a
-	// sufficiently large size (e.g. 64KiB). (en)
-	dec := json.NewDecoder(bufio.NewReaderSize(sess, 64*1024))
-
-	if err := dec.Decode(&req); err != nil {
-		log.Error("failed to read handshake request", logging.Fields{
-			"error": err.Error(),
-		})
-		return nil, fmt.Errorf("read handshake request: %w", err)
-	}
-
-	req.Domain = stringTrimSpace(req.Domain)
-	req.ClientAPIKey = stringTrimSpace(req.ClientAPIKey)
-
-	if req.Domain == "" || req.ClientAPIKey == "" {
-		_ = writeHandshakeResponse(sess, handshakeResponse{
-			OK:      false,
-			Message: "domain and client_api_key are required",
-			Domain:  req.Domain,
-		})
-		return nil, fmt.Errorf("invalid handshake parameters")
-	}
-
-	if err := validator.ValidateDomainAPIKey(ctx, req.Domain, req.ClientAPIKey); err != nil {
-		log.Warn("domain/api_key validation failed", logging.Fields{
-			"domain": req.Domain,
-			"error":  err.Error(),
-		})
-		_ = writeHandshakeResponse(sess, handshakeResponse{
-			OK:      false,
-			Message: "invalid domain or api key",
-			Domain:  req.Domain,
-		})
-		return nil, fmt.Errorf("handshake validation failed: %w", err)
-	}
-
-	// 검증 성공
-	log.Info("dtls handshake success", logging.Fields{
-		"domain": req.Domain,
-	})
-
-	if err := writeHandshakeResponse(sess, handshakeResponse{
-		OK:      true,
-		Message: "handshake ok",
-		Domain:  req.Domain,
-	}); err != nil {
-		log.Error("failed to write handshake response", logging.Fields{
-			"domain": req.Domain,
-			"error":  err.Error(),
-		})
-		return nil, fmt.Errorf("write handshake response: %w", err)
-	}
-
-	return &ServerHandshakeResult{
-		Domain: req.Domain,
-	}, nil
-}
-
-// PerformClientHandshake 는 클라이언트 측에서 DTLS 세션이 생성된 직후 호출되어
-// 서버로 (domain, client_api_key)를 전송하고 결과를 검증합니다.
-//
-// localTarget 은 "로컬에서 요청할 서버 주소" (예: 127.0.0.1:8080) 로,
-// 핸드셰이크 성공 시 로그에 함께 출력됩니다.
-func PerformClientHandshake(
-	ctx context.Context,
-	sess Session,
-	logger logging.Logger,
-	domain string,
-	clientAPIKey string,
-	localTarget string,
-) (*ClientHandshakeResult, error) {
-	log := logger.With(logging.Fields{"phase": "dtls_handshake", "side": "client"})
-
-	if err := ctx.Err(); err != nil {
-		return nil, err
-	}
-
-	req := handshakeRequest{
-		Domain:       stringTrimSpace(domain),
-		ClientAPIKey: stringTrimSpace(clientAPIKey),
-	}
-
-	if req.Domain == "" || req.ClientAPIKey == "" {
-		return nil, fmt.Errorf("domain and client_api_key are required")
-	}
-
-	if err := writeHandshakeRequest(sess, req); err != nil {
-		log.Error("failed to write handshake request", logging.Fields{
-			"error": err.Error(),
-		})
-		return nil, fmt.Errorf("write handshake request: %w", err)
-	}
-
-	var resp handshakeResponse
-	// 클라이언트 측에서도 동일하게 큰 버퍼를 사용해 "buffer too small" 오류를 방지합니다. (ko)
-	// Use the same larger buffer on the client side as well. (en)
-	dec := json.NewDecoder(bufio.NewReaderSize(sess, 64*1024))
-
-	if err := dec.Decode(&resp); err != nil {
-		log.Error("failed to read handshake response", logging.Fields{
-			"error": err.Error(),
-		})
-		return nil, fmt.Errorf("read handshake response: %w", err)
-	}
-
-	if !resp.OK {
-		log.Error("dtls handshake failed", logging.Fields{
-			"domain":  req.Domain,
-			"message": resp.Message,
-		})
-		return nil, fmt.Errorf("handshake failed: %s", resp.Message)
-	}
-
-	// 성공 로그: 연결 성공 메시지 + 도메인 + 로컬에서 요청할 서버 주소
-	log.Info("dtls handshake success", logging.Fields{
-		"domain":       resp.Domain,
-		"message":      resp.Message,
-		"local_target": localTarget,
-	})
-
-	return &ClientHandshakeResult{
-		Domain:  resp.Domain,
-		Message: resp.Message,
-	}, nil
-}
-
-// writeHandshakeRequest 는 JSON 인코더를 사용해 handshakeRequest 를 세션으로 전송합니다.
-func writeHandshakeRequest(sess Session, req handshakeRequest) error {
-	enc := json.NewEncoder(sess)
-	return enc.Encode(&req)
-}
-
-// writeHandshakeResponse 는 JSON 인코더를 사용해 handshakeResponse 를 세션으로 전송합니다.
-func writeHandshakeResponse(sess Session, resp handshakeResponse) error {
-	enc := json.NewEncoder(sess)
-	return enc.Encode(&resp)
-}
-
-func stringTrimSpace(s string) string {
-	return strings.TrimSpace(s)
-}

internal/dtls/selfsigned.go

@@ -1,69 +0,0 @@
-package dtls
-
-import (
-	"crypto/rand"
-	"crypto/rsa"
-	"crypto/tls"
-	"crypto/x509"
-	"crypto/x509/pkix"
-	"math/big"
-	"net"
-	"time"
-)
-
-// NewSelfSignedLocalhostConfig 는 테스트용 self-signed TLS 설정을 생성합니다.
-//
-// - CN: "localhost"
-// - DNS SAN: ["localhost"]
-// - IP SAN: [127.0.0.1]
-// - 유효기간: 생성 시점 기준 1년
-//
-// DTLS, 일반 TLS 서버 모두에서 사용할 수 있으며,
-// 서버 측에서는 Certificates 에 이 인증서를 넣어주고,
-// 클라이언트 측에서는 debug 모드에서 InsecureSkipVerify 를 true 로 두어
-// 체인 검증을 스킵하는 방식으로 사용할 수 있습니다.
-func NewSelfSignedLocalhostConfig() (*tls.Config, error) {
-	priv, err := rsa.GenerateKey(rand.Reader, 2048)
-	if err != nil {
-		return nil, err
-	}
-
-	serial, err := rand.Int(rand.Reader, big.NewInt(1<<62))
-	if err != nil {
-		return nil, err
-	}
-
-	notBefore := time.Now().Add(-1 * time.Hour)
-	notAfter := notBefore.Add(365 * 24 * time.Hour)
-
-	template := &x509.Certificate{
-		SerialNumber: serial,
-		Subject: pkix.Name{
-			CommonName: "localhost",
-		},
-		NotBefore: notBefore,
-		NotAfter:  notAfter,
-
-		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
-		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
-		BasicConstraintsValid: true,
-
-		DNSNames:    []string{"localhost"},
-		IPAddresses: []net.IP{net.ParseIP("127.0.0.1")},
-	}
-
-	derBytes, err := x509.CreateCertificate(rand.Reader, template, template, &priv.PublicKey, priv)
-	if err != nil {
-		return nil, err
-	}
-
-	tlsCert := tls.Certificate{
-		Certificate: [][]byte{derBytes},
-		PrivateKey:  priv,
-	}
-
-	return &tls.Config{
-		Certificates: []tls.Certificate{tlsCert},
-		MinVersion:   tls.VersionTLS12,
-	}, nil
-}

internal/dtls/transport_pion.go

@@ -1,58 +0,0 @@
-package dtls
-
-import (
-	"crypto/tls"
-	"fmt"
-	"time"
-)
-
-// PionServerConfig 는 DTLS 서버 리스너 구성을 정의하는 기존 구조체를 그대로 유지합니다. (ko)
-// PionServerConfig keeps the old DTLS server listener configuration shape for compatibility. (en)
-type PionServerConfig struct {
-	Addr      string
-	TLSConfig *tls.Config
-}
-
-// PionClientConfig 는 DTLS 클라이언트 구성을 정의하는 기존 구조체를 그대로 유지합니다. (ko)
-// PionClientConfig keeps the old DTLS client configuration shape for compatibility. (en)
-type PionClientConfig struct {
-	Addr      string
-	TLSConfig *tls.Config
-	Timeout   time.Duration
-}
-
-// disabledServer 는 DTLS 전송이 비활성화되었음을 나타내는 더미 구현입니다. (ko)
-// disabledServer is a dummy Server implementation indicating that DTLS transport is disabled. (en)
-type disabledServer struct{}
-
-func (s *disabledServer) Accept() (Session, error) {
-	return nil, fmt.Errorf("dtls transport is disabled; use gRPC tunnel instead")
-}
-
-func (s *disabledServer) Close() error {
-	return nil
-}
-
-// disabledClient 는 DTLS 전송이 비활성화되었음을 나타내는 더미 구현입니다. (ko)
-// disabledClient is a dummy Client implementation indicating that DTLS transport is disabled. (en)
-type disabledClient struct{}
-
-func (c *disabledClient) Connect() (Session, error) {
-	return nil, fmt.Errorf("dtls transport is disabled; use gRPC tunnel instead")
-}
-
-func (c *disabledClient) Close() error {
-	return nil
-}
-
-// NewPionServer 는 더 이상 실제 DTLS 서버를 생성하지 않고, 항상 에러를 반환합니다. (ko)
-// NewPionServer no longer creates a real DTLS server and always returns an error. (en)
-func NewPionServer(cfg PionServerConfig) (Server, error) {
-	return nil, fmt.Errorf("dtls transport is disabled; NewPionServer is no longer supported")
-}
-
-// NewPionClient 는 더 이상 실제 DTLS 클라이언트를 생성하지 않고, disabledClient 를 반환합니다. (ko)
-// NewPionClient no longer creates a real DTLS client and instead returns a disabledClient. (en)
-func NewPionClient(cfg PionClientConfig) Client {
-	return &disabledClient{}
-}

internal/dtls/validator_dummy.go

@@ -1,33 +0,0 @@
-package dtls
-
-import (
-	"context"
-
-	"github.com/dalbodeule/hop-gate/internal/logging"
-)
-
-// DomainValidator 는 handshake.go 에 정의된 인터페이스를 재노출합니다.
-// (동일 패키지이므로 별도 선언 없이 사용하지만, 여기에 더미 구현을 둡니다.)
-
-// DummyDomainValidator 는 임시 개발용으로 모든 (domain, api_key) 조합을 허용하는 Validator 입니다.
-// 실제 운영 환경에서는 ent + PostgreSQL 기반의 구현으로 교체해야 합니다.
-type DummyDomainValidator struct {
-	Logger logging.Logger
-}
-
-func (d DummyDomainValidator) ValidateDomainAPIKey(ctx context.Context, domain, clientAPIKey string) error {
-	if d.Logger != nil {
-		d.Logger.Debug("dummy domain validator used (ALWAYS ALLOW)", logging.Fields{
-			"domain":                domain,
-			"client_api_key_masked": maskKey(clientAPIKey),
-		})
-	}
-	return nil
-}
-
-func maskKey(key string) string {
-	if len(key) <= 8 {
-		return "***"
-	}
-	return key[:4] + "..." + key[len(key)-4:]
-}

internal/errorpages/assets/errors.css

@@ -1,2 +1,2 @@
-/*! tailwindcss v4.1.17 | MIT License | https://tailwindcss.com */
+/*! tailwindcss v4.3.3 | MIT License | https://tailwindcss.com */
-@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-tracking:initial;--tw-blur:initial;--tw-brightness:initial;--tw-contrast:initial;--tw-grayscale:initial;--tw-hue-rotate:initial;--tw-invert:initial;--tw-opacity:initial;--tw-saturate:initial;--tw-sepia:initial;--tw-drop-shadow:initial;--tw-drop-shadow-color:initial;--tw-drop-shadow-alpha:100%;--tw-drop-shadow-size:initial}}}.visible{visibility:visible}.absolute{position:absolute}.fixed{position:fixed}.static{position:static}.container{width:100%}.contents{display:contents}.flex{display:flex}.inline-flex{display:inline-flex}.table{display:table}.min-h-screen{min-height:100vh}.w-\[240px\]{width:240px}.w-full{width:100%}.flex-col{flex-direction:column}.items-baseline{align-items:baseline}.items-center{align-items:center}.justify-center{justify-content:center}.text-center{text-align:center}.tracking-\[0\.25em\]{--tw-tracking:.25em;letter-spacing:.25em}.uppercase{text-transform:uppercase}.opacity-90{opacity:.9}.filter{filter:var(--tw-blur,)var(--tw-brightness,)var(--tw-contrast,)var(--tw-grayscale,)var(--tw-hue-rotate,)var(--tw-invert,)var(--tw-saturate,)var(--tw-sepia,)var(--tw-drop-shadow,)}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}
+@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-tracking:initial;--tw-blur:initial;--tw-brightness:initial;--tw-contrast:initial;--tw-grayscale:initial;--tw-hue-rotate:initial;--tw-invert:initial;--tw-opacity:initial;--tw-saturate:initial;--tw-sepia:initial;--tw-drop-shadow:initial;--tw-drop-shadow-color:initial;--tw-drop-shadow-alpha:100%;--tw-drop-shadow-size:initial}}}.visible{visibility:visible}.absolute{position:absolute}.fixed{position:fixed}.static{position:static}.container{width:100%}.contents{display:contents}.flex{display:flex}.inline-flex{display:inline-flex}.table{display:table}.min-h-screen{min-height:100vh}.w-\[240px\]{width:240px}.w-full{width:100%}.flex-col{flex-direction:column}.items-baseline{align-items:baseline}.items-center{align-items:center}.justify-center{justify-content:center}.text-center{text-align:center}.tracking-\[0\.25em\]{--tw-tracking:.25em;letter-spacing:.25em}.uppercase{text-transform:uppercase}.opacity-90{opacity:.9}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}

internal/errorpages/errorpages.go

@@ -10,8 +10,8 @@ import (
 )
 
 // StatusTLSHandshakeFailed is an HTTP-style status code representing
-// a TLS/DTLS handshake failure (similar to Cloudflare 525).
+// a TLS tunnel handshake failure (similar to Cloudflare 525).
-// TLS/DTLS 핸드셰이크 실패를 나타내는 HTTP 스타일 상태 코드입니다. (예: 525)
+// TLS 터널 핸드셰이크 실패를 나타내는 HTTP 스타일 상태 코드입니다. (예: 525)
 const StatusTLSHandshakeFailed = 525
 
 // StatusGatewayTimeout is an HTTP-style status code representing

internal/observability/metrics.go

@@ -8,15 +8,6 @@ import (
 // Prometheus 기본 네임스페이스를 사용하며, 메트릭 이름에 hopgate_ 접두어를 붙입니다.
 
 var (
-	// DTLS 핸드셰이크 총 횟수 (성공/실패 라벨 포함).
-	DTLSHandshakesTotal = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "hopgate_dtls_handshakes_total",
-			Help: "Total number of DTLS handshakes, labeled by result.",
-		},
-		[]string{"result"}, // success, failure
-	)
-
 	// HTTP/Proxy 엔드포인트를 통해 들어온 요청 수 (메서드/상태 코드 라벨 포함).
 	HTTPRequestsTotal = prometheus.NewCounterVec(
 		prometheus.CounterOpts{
@@ -42,7 +33,7 @@ var (
 			Name: "hopgate_proxy_errors_total",
 			Help: "Total number of proxy-related errors, labeled by error type.",
 		},
-		[]string{"type"}, // e.g. no_dtls_session, dtls_forward_failed, acme_http01_error
+		[]string{"type"}, // e.g. no_tunnel_session, tunnel_forward_failed, acme_http01_error
 	)
 )
 
@@ -50,7 +41,6 @@ var (
 // 서버 시작 시 한 번만 호출해야 합니다.
 func MustRegister() {
 	prometheus.MustRegister(
-		DTLSHandshakesTotal,
 		HTTPRequestsTotal,
 		HTTPRequestDurationSeconds,
 		ProxyErrorsTotal,

internal/protocol/codec.go

@@ -1,427 +0,0 @@
-package protocol
-
-import (
-	"bufio"
-	"encoding/binary"
-	"encoding/json"
-	"fmt"
-	"io"
-
-	protocolpb "github.com/dalbodeule/hop-gate/internal/protocol/pb"
-	"google.golang.org/protobuf/proto"
-)
-
-// defaultDecoderBufferSize 는 pion/dtls 가 복호화한 애플리케이션 데이터를
-// JSON 디코더가 안전하게 처리할 수 있도록 사용하는 버퍼 크기입니다.
-// This matches existing 64KiB readers used around DTLS sessions (used by the JSON codec).
-const defaultDecoderBufferSize = 64 * 1024
-
-// dtlsReadBufferSize 는 pion/dtls 내부 버퍼 한계에 맞춘 읽기 버퍼 크기입니다.
-// pion/dtls 의 UnpackDatagram 함수는 8KB (8,192 bytes) 의 기본 수신 버퍼를 사용합니다.
-// DTLS는 UDP 기반이므로 한 번의 Read()에서 전체 datagram을 읽어야 하며,
-// 이 크기를 초과하는 DTLS 레코드는 처리되지 않습니다.
-// dtlsReadBufferSize matches the pion/dtls internal buffer limit.
-// pion/dtls's UnpackDatagram function uses an 8KB (8,192 bytes) receive buffer.
-// Since DTLS is UDP-based, the entire datagram must be read in a single Read() call,
-// and DTLS records exceeding this size cannot be processed.
-const dtlsReadBufferSize = 8 * 1024 // 8KB
-
-// maxProtoEnvelopeBytes 는 단일 Protobuf Envelope 의 최대 크기에 대한 보수적 상한입니다.
-// 아직 하드 리미트로 사용하지는 않지만, 향후 방어적 체크에 사용할 수 있습니다.
-const maxProtoEnvelopeBytes = 512 * 1024 // 512KiB, 충분히 여유 있는 값
-
-// WireCodec 는 protocol.Envelope 의 직렬화/역직렬화를 추상화합니다.
-// JSON, Protobuf, length-prefixed binary 등으로 교체할 때 이 인터페이스만 유지하면 됩니다.
-type WireCodec interface {
-	Encode(w io.Writer, env *Envelope) error
-	Decode(r io.Reader, env *Envelope) error
-}
-
-// jsonCodec 은 JSON 기반 WireCodec 구현입니다.
-// JSON 직렬화를 계속 사용하고 싶을 때를 위해 남겨둡니다.
-type jsonCodec struct{}
-
-// Encode 는 Envelope 를 JSON 으로 인코딩해 작성합니다.
-// Encode encodes an Envelope as JSON to the given writer.
-func (jsonCodec) Encode(w io.Writer, env *Envelope) error {
-	enc := json.NewEncoder(w)
-	return enc.Encode(env)
-}
-
-// Decode 는 DTLS 세션에서 읽은 데이터를 JSON Envelope 로 디코딩합니다.
-// pion/dtls 의 버퍼 특성 때문에, 충분히 큰 bufio.Reader 로 감싸서 사용합니다.
-// Decode decodes an Envelope from JSON using a buffered reader on top of the DTLS session.
-func (jsonCodec) Decode(r io.Reader, env *Envelope) error {
-	dec := json.NewDecoder(bufio.NewReaderSize(r, defaultDecoderBufferSize))
-	return dec.Decode(env)
-}
-
-// protobufCodec 은 Protobuf  length-prefix framing 기반 WireCodec 구현입니다.
-// 한 Envelope 당 [4바이트 big-endian 길이]  [protobuf bytes] 형태로 인코딩합니다.
-type protobufCodec struct{}
-
-// Encode 는 Envelope 를 Protobuf Envelope 로 변환한 뒤, length-prefix 프레이밍으로 기록합니다.
-// DTLS는 UDP 기반이므로, length prefix와 protobuf 데이터를 단일 버퍼로 합쳐 하나의 Write로 전송합니다.
-// Encode encodes an Envelope as a length-prefixed protobuf message.
-// For DTLS (UDP-based), we combine the length prefix and protobuf data into a single buffer
-// and send it with a single Write call to preserve message boundaries.
-func (protobufCodec) Encode(w io.Writer, env *Envelope) error {
-	pbEnv, err := toProtoEnvelope(env)
-	if err != nil {
-		return err
-	}
-
-	// Body/stream payload 하드 리밋: 4KiB (StreamChunkSize).
-	// HTTP 단일 Envelope 및 스트림 기반 프레임 모두에서 payload 가 이 값을 넘지 않도록 강제합니다.
-	// Enforce a 4KiB hard limit (StreamChunkSize) for HTTP bodies and stream payloads.
-	switch env.Type {
-	case MessageTypeHTTP:
-		if env.HTTPRequest != nil && len(env.HTTPRequest.Body) > int(StreamChunkSize) {
-			return fmt.Errorf("protobuf codec: http request body too large: %d bytes (max %d)", len(env.HTTPRequest.Body), StreamChunkSize)
-		}
-		if env.HTTPResponse != nil && len(env.HTTPResponse.Body) > int(StreamChunkSize) {
-			return fmt.Errorf("protobuf codec: http response body too large: %d bytes (max %d)", len(env.HTTPResponse.Body), StreamChunkSize)
-		}
-	case MessageTypeStreamData:
-		if env.StreamData != nil && len(env.StreamData.Data) > int(StreamChunkSize) {
-			return fmt.Errorf("protobuf codec: stream data payload too large: %d bytes (max %d)", len(env.StreamData.Data), StreamChunkSize)
-		}
-	}
-
-	data, err := proto.Marshal(pbEnv)
-	if err != nil {
-		return fmt.Errorf("protobuf marshal envelope: %w", err)
-	}
-	if len(data) == 0 {
-		return fmt.Errorf("protobuf codec: empty marshaled envelope")
-	}
-
-	if len(data) > int(^uint32(0)) {
-		return fmt.Errorf("protobuf codec: envelope too large: %d bytes", len(data))
-	}
-
-	// DTLS 환경에서는 length prefix와 protobuf 데이터를 단일 버퍼로 합쳐서 하나의 Write로 전송
-	// For DTLS, combine length prefix and protobuf data into a single buffer
-	frame := make([]byte, 4+len(data))
-	binary.BigEndian.PutUint32(frame[:4], uint32(len(data)))
-	copy(frame[4:], data)
-
-	if _, err := w.Write(frame); err != nil {
-		return fmt.Errorf("protobuf codec: write frame: %w", err)
-	}
-	return nil
-}
-
-// Decode 는 length-prefix 프레임에서 Protobuf Envelope 를 읽어들여
-// 내부 Envelope 구조체로 변환합니다.
-// DTLS는 UDP 기반이므로, 한 번의 Read로 전체 데이터그램을 읽습니다.
-// Decode reads a length-prefixed protobuf Envelope and converts it into the internal Envelope.
-// For DTLS (UDP-based), we read the entire datagram in a single Read call.
-func (protobufCodec) Decode(r io.Reader, env *Envelope) error {
-	// 1) 길이 prefix 4바이트를 정확히 읽는다.
-	header := make([]byte, 4)
-	if _, err := io.ReadFull(r, header); err != nil {
-		return fmt.Errorf("protobuf codec: read length prefix: %w", err)
-	}
-
-	length := binary.BigEndian.Uint32(header)
-	if length == 0 {
-		return fmt.Errorf("protobuf codec: zero-length envelope")
-	}
-	if length > maxProtoEnvelopeBytes {
-		return fmt.Errorf("protobuf codec: envelope too large: %d bytes (max %d)", length, maxProtoEnvelopeBytes)
-	}
-
-	// 2) payload 를 length 바이트만큼 정확히 읽는다.
-	payload := make([]byte, int(length))
-	if _, err := io.ReadFull(r, payload); err != nil {
-		return fmt.Errorf("protobuf codec: read payload: %w", err)
-	}
-
-	var pbEnv protocolpb.Envelope
-	if err := proto.Unmarshal(payload, &pbEnv); err != nil {
-		return fmt.Errorf("protobuf codec: unmarshal envelope: %w", err)
-	}
-
-	return fromProtoEnvelope(&pbEnv, env)
-}
-
-// DefaultCodec 은 현재 런타임에서 사용하는 기본 WireCodec 입니다.
-// 현재는 Protobuf  length-prefix 기반 codec 을 기본으로 사용합니다.
-// 서버와 클라이언트가 모두 이 버전을 사용해야 wire-format 이 일치합니다.
-var DefaultCodec WireCodec = protobufCodec{}
-
-// GetDTLSReadBufferSize 는 DTLS 세션 읽기에 사용할 버퍼 크기를 반환합니다.
-// 이 값은 pion/dtls 내부 버퍼 한계(8KB)에 맞춰져 있습니다.
-// GetDTLSReadBufferSize returns the buffer size to use for reading from DTLS sessions.
-// This value is aligned with pion/dtls's internal buffer limit (8KB).
-func GetDTLSReadBufferSize() int {
-	return dtlsReadBufferSize
-}
-
-// toProtoEnvelope 는 내부 Envelope 구조체를 Protobuf Envelope 로 변환합니다.
-// 현재 구현은 HTTP 요청/응답 및 스트림 관련 타입(StreamOpen/StreamData/StreamClose/StreamAck)을 지원합니다.
-func toProtoEnvelope(env *Envelope) (*protocolpb.Envelope, error) {
-	switch env.Type {
-	case MessageTypeHTTP:
-		if env.HTTPRequest != nil {
-			req := env.HTTPRequest
-			pbReq := &protocolpb.Request{
-				RequestId:   req.RequestID,
-				ClientId:    req.ClientID,
-				ServiceName: req.ServiceName,
-				Method:      req.Method,
-				Url:         req.URL,
-				Header:      make(map[string]*protocolpb.HeaderValues, len(req.Header)),
-				Body:        req.Body,
-			}
-			for k, vs := range req.Header {
-				hv := &protocolpb.HeaderValues{
-					Values: append([]string(nil), vs...),
-				}
-				pbReq.Header[k] = hv
-			}
-			return &protocolpb.Envelope{
-				Payload: &protocolpb.Envelope_HttpRequest{
-					HttpRequest: pbReq,
-				},
-			}, nil
-		}
-		if env.HTTPResponse != nil {
-			resp := env.HTTPResponse
-			pbResp := &protocolpb.Response{
-				RequestId: resp.RequestID,
-				Status:    int32(resp.Status),
-				Header:    make(map[string]*protocolpb.HeaderValues, len(resp.Header)),
-				Body:      resp.Body,
-				Error:     resp.Error,
-			}
-			for k, vs := range resp.Header {
-				hv := &protocolpb.HeaderValues{
-					Values: append([]string(nil), vs...),
-				}
-				pbResp.Header[k] = hv
-			}
-			return &protocolpb.Envelope{
-				Payload: &protocolpb.Envelope_HttpResponse{
-					HttpResponse: pbResp,
-				},
-			}, nil
-		}
-		return nil, fmt.Errorf("protobuf codec: http envelope has neither request nor response")
-	case MessageTypeStreamOpen:
-		if env.StreamOpen == nil {
-			return nil, fmt.Errorf("protobuf codec: stream_open envelope missing payload")
-		}
-		so := env.StreamOpen
-		pbSO := &protocolpb.StreamOpen{
-			Id:          string(so.ID),
-			ServiceName: so.Service,
-			TargetAddr:  so.TargetAddr,
-			Header:      make(map[string]*protocolpb.HeaderValues, len(so.Header)),
-		}
-		for k, vs := range so.Header {
-			hv := &protocolpb.HeaderValues{
-				Values: append([]string(nil), vs...),
-			}
-			pbSO.Header[k] = hv
-		}
-		return &protocolpb.Envelope{
-			Payload: &protocolpb.Envelope_StreamOpen{
-				StreamOpen: pbSO,
-			},
-		}, nil
-	case MessageTypeStreamData:
-		if env.StreamData == nil {
-			return nil, fmt.Errorf("protobuf codec: stream_data envelope missing payload")
-		}
-		sd := env.StreamData
-		pbSD := &protocolpb.StreamData{
-			Id:   string(sd.ID),
-			Seq:  sd.Seq,
-			Data: sd.Data,
-		}
-		return &protocolpb.Envelope{
-			Payload: &protocolpb.Envelope_StreamData{
-				StreamData: pbSD,
-			},
-		}, nil
-	case MessageTypeStreamClose:
-		if env.StreamClose == nil {
-			return nil, fmt.Errorf("protobuf codec: stream_close envelope missing payload")
-		}
-		sc := env.StreamClose
-		pbSC := &protocolpb.StreamClose{
-			Id:    string(sc.ID),
-			Error: sc.Error,
-		}
-		return &protocolpb.Envelope{
-			Payload: &protocolpb.Envelope_StreamClose{
-				StreamClose: pbSC,
-			},
-		}, nil
-	case MessageTypeStreamAck:
-		if env.StreamAck == nil {
-			return nil, fmt.Errorf("protobuf codec: stream_ack envelope missing payload")
-		}
-		sa := env.StreamAck
-		pbSA := &protocolpb.StreamAck{
-			Id:         string(sa.ID),
-			AckSeq:     sa.AckSeq,
-			LostSeqs:   append([]uint64(nil), sa.LostSeqs...),
-			WindowSize: sa.WindowSize,
-		}
-		return &protocolpb.Envelope{
-			Payload: &protocolpb.Envelope_StreamAck{
-				StreamAck: pbSA,
-			},
-		}, nil
-	default:
-		return nil, fmt.Errorf("protobuf codec: unsupported envelope type %q", env.Type)
-	}
-}
-
-// fromProtoEnvelope 는 Protobuf Envelope 를 내부 Envelope 구조체로 변환합니다.
-// 현재 구현은 HTTP 요청/응답 및 스트림 관련 타입(StreamOpen/StreamData/StreamClose/StreamAck)을 지원합니다.
-func fromProtoEnvelope(pbEnv *protocolpb.Envelope, env *Envelope) error {
-	switch payload := pbEnv.Payload.(type) {
-	case *protocolpb.Envelope_HttpRequest:
-		req := payload.HttpRequest
-		if req == nil {
-			return fmt.Errorf("protobuf codec: http_request payload is nil")
-		}
-		hdr := make(map[string][]string, len(req.Header))
-		for k, hv := range req.Header {
-			if hv == nil {
-				continue
-			}
-			hdr[k] = append([]string(nil), hv.Values...)
-		}
-		env.Type = MessageTypeHTTP
-		env.HTTPRequest = &Request{
-			RequestID:   req.RequestId,
-			ClientID:    req.ClientId,
-			ServiceName: req.ServiceName,
-			Method:      req.Method,
-			URL:         req.Url,
-			Header:      hdr,
-			Body:        append([]byte(nil), req.Body...),
-		}
-		env.HTTPResponse = nil
-		env.StreamOpen = nil
-		env.StreamData = nil
-		env.StreamClose = nil
-		env.StreamAck = nil
-		return nil
-
-	case *protocolpb.Envelope_HttpResponse:
-		resp := payload.HttpResponse
-		if resp == nil {
-			return fmt.Errorf("protobuf codec: http_response payload is nil")
-		}
-		hdr := make(map[string][]string, len(resp.Header))
-		for k, hv := range resp.Header {
-			if hv == nil {
-				continue
-			}
-			hdr[k] = append([]string(nil), hv.Values...)
-		}
-		env.Type = MessageTypeHTTP
-		env.HTTPResponse = &Response{
-			RequestID: resp.RequestId,
-			Status:    int(resp.Status),
-			Header:    hdr,
-			Body:      append([]byte(nil), resp.Body...),
-			Error:     resp.Error,
-		}
-		env.HTTPRequest = nil
-		env.StreamOpen = nil
-		env.StreamData = nil
-		env.StreamClose = nil
-		env.StreamAck = nil
-		return nil
-
-	case *protocolpb.Envelope_StreamOpen:
-		so := payload.StreamOpen
-		if so == nil {
-			return fmt.Errorf("protobuf codec: stream_open payload is nil")
-		}
-		hdr := make(map[string][]string, len(so.Header))
-		for k, hv := range so.Header {
-			if hv == nil {
-				continue
-			}
-			hdr[k] = append([]string(nil), hv.Values...)
-		}
-		env.Type = MessageTypeStreamOpen
-		env.StreamOpen = &StreamOpen{
-			ID:         StreamID(so.Id),
-			Service:    so.ServiceName,
-			TargetAddr: so.TargetAddr,
-			Header:     hdr,
-		}
-		env.StreamData = nil
-		env.StreamClose = nil
-		env.StreamAck = nil
-		env.HTTPRequest = nil
-		env.HTTPResponse = nil
-		return nil
-
-	case *protocolpb.Envelope_StreamData:
-		sd := payload.StreamData
-		if sd == nil {
-			return fmt.Errorf("protobuf codec: stream_data payload is nil")
-		}
-		env.Type = MessageTypeStreamData
-		env.StreamData = &StreamData{
-			ID:   StreamID(sd.Id),
-			Seq:  sd.Seq,
-			Data: append([]byte(nil), sd.Data...),
-		}
-		env.StreamOpen = nil
-		env.StreamClose = nil
-		env.StreamAck = nil
-		env.HTTPRequest = nil
-		env.HTTPResponse = nil
-		return nil
-
-	case *protocolpb.Envelope_StreamClose:
-		sc := payload.StreamClose
-		if sc == nil {
-			return fmt.Errorf("protobuf codec: stream_close payload is nil")
-		}
-		env.Type = MessageTypeStreamClose
-		env.StreamClose = &StreamClose{
-			ID:    StreamID(sc.Id),
-			Error: sc.Error,
-		}
-		env.StreamOpen = nil
-		env.StreamData = nil
-		env.StreamAck = nil
-		env.HTTPRequest = nil
-		env.HTTPResponse = nil
-		return nil
-
-	case *protocolpb.Envelope_StreamAck:
-		sa := payload.StreamAck
-		if sa == nil {
-			return fmt.Errorf("protobuf codec: stream_ack payload is nil")
-		}
-		env.Type = MessageTypeStreamAck
-		env.StreamAck = &StreamAck{
-			ID:         StreamID(sa.Id),
-			AckSeq:     sa.AckSeq,
-			LostSeqs:   append([]uint64(nil), sa.LostSeqs...),
-			WindowSize: sa.WindowSize,
-		}
-		env.StreamOpen = nil
-		env.StreamData = nil
-		env.StreamClose = nil
-		env.HTTPRequest = nil
-		env.HTTPResponse = nil
-		return nil
-
-	default:
-		return fmt.Errorf("protobuf codec: unsupported payload type %T", payload)
-	}
-}

internal/protocol/codec_test.go

@@ -1,226 +0,0 @@
-package protocol
-
-import (
-	"bufio"
-	"bytes"
-	"io"
-	"testing"
-)
-
-// mockDatagramConn simulates a datagram-based connection (like DTLS over UDP)
-// where each Write sends a separate message and each Read receives a complete message.
-// This mock verifies the FIXED behavior where the codec properly handles message boundaries.
-type mockDatagramConn struct {
-	messages [][]byte
-	readIdx  int
-}
-
-func newMockDatagramConn() *mockDatagramConn {
-	return &mockDatagramConn{
-		messages: make([][]byte, 0),
-	}
-}
-
-func (m *mockDatagramConn) Write(p []byte) (n int, err error) {
-	// Simulate datagram behavior: each Write is a separate message
-	msg := make([]byte, len(p))
-	copy(msg, p)
-	m.messages = append(m.messages, msg)
-	return len(p), nil
-}
-
-func (m *mockDatagramConn) Read(p []byte) (n int, err error) {
-	// Simulate datagram behavior: each Read returns a complete message
-	if m.readIdx >= len(m.messages) {
-		return 0, io.EOF
-	}
-	msg := m.messages[m.readIdx]
-	m.readIdx++
-	if len(p) < len(msg) {
-		return 0, io.ErrShortBuffer
-	}
-	copy(p, msg)
-	return len(msg), nil
-}
-
-// TestProtobufCodecDatagramBehavior tests that the protobuf codec works correctly
-// with datagram-based transports (like DTLS over UDP) where message boundaries are preserved.
-func TestProtobufCodecDatagramBehavior(t *testing.T) {
-	codec := protobufCodec{}
-	conn := newMockDatagramConn()
-
-	// Create a test envelope
-	testEnv := &Envelope{
-		Type: MessageTypeHTTP,
-		HTTPRequest: &Request{
-			RequestID:   "test-req-123",
-			ClientID:    "client-1",
-			ServiceName: "test-service",
-			Method:      "GET",
-			URL:         "/test/path",
-			Header: map[string][]string{
-				"User-Agent": {"test-client"},
-			},
-			Body: []byte("test body content"),
-		},
-	}
-
-	// Encode the envelope
-	if err := codec.Encode(conn, testEnv); err != nil {
-		t.Fatalf("Failed to encode envelope: %v", err)
-	}
-
-	// Verify that exactly one message was written (length prefix + data in single Write)
-	if len(conn.messages) != 1 {
-		t.Fatalf("Expected 1 message to be written, got %d", len(conn.messages))
-	}
-
-	// Verify the message structure: [4-byte length][protobuf data]
-	msg := conn.messages[0]
-	if len(msg) < 4 {
-		t.Fatalf("Message too short: %d bytes", len(msg))
-	}
-
-	// Decode the envelope using a buffered reader (as we do in actual code)
-	// to handle datagram-based reading properly
-	reader := bufio.NewReaderSize(conn, GetDTLSReadBufferSize())
-	var decodedEnv Envelope
-	if err := codec.Decode(reader, &decodedEnv); err != nil {
-		t.Fatalf("Failed to decode envelope: %v", err)
-	}
-
-	// Verify the decoded envelope matches the original
-	if decodedEnv.Type != testEnv.Type {
-		t.Errorf("Type mismatch: got %v, want %v", decodedEnv.Type, testEnv.Type)
-	}
-	if decodedEnv.HTTPRequest == nil {
-		t.Fatal("HTTPRequest is nil after decode")
-	}
-	if decodedEnv.HTTPRequest.RequestID != testEnv.HTTPRequest.RequestID {
-		t.Errorf("RequestID mismatch: got %v, want %v", decodedEnv.HTTPRequest.RequestID, testEnv.HTTPRequest.RequestID)
-	}
-	if decodedEnv.HTTPRequest.Method != testEnv.HTTPRequest.Method {
-		t.Errorf("Method mismatch: got %v, want %v", decodedEnv.HTTPRequest.Method, testEnv.HTTPRequest.Method)
-	}
-	if decodedEnv.HTTPRequest.URL != testEnv.HTTPRequest.URL {
-		t.Errorf("URL mismatch: got %v, want %v", decodedEnv.HTTPRequest.URL, testEnv.HTTPRequest.URL)
-	}
-	if !bytes.Equal(decodedEnv.HTTPRequest.Body, testEnv.HTTPRequest.Body) {
-		t.Errorf("Body mismatch: got %v, want %v", decodedEnv.HTTPRequest.Body, testEnv.HTTPRequest.Body)
-	}
-}
-
-// TestProtobufCodecStreamData tests encoding/decoding of StreamData messages
-func TestProtobufCodecStreamData(t *testing.T) {
-	codec := protobufCodec{}
-	conn := newMockDatagramConn()
-
-	// Create a StreamData envelope
-	testEnv := &Envelope{
-		Type: MessageTypeStreamData,
-		StreamData: &StreamData{
-			ID:   StreamID("stream-123"),
-			Seq:  42,
-			Data: []byte("stream data payload"),
-		},
-	}
-
-	// Encode
-	if err := codec.Encode(conn, testEnv); err != nil {
-		t.Fatalf("Failed to encode StreamData: %v", err)
-	}
-
-	// Verify single message
-	if len(conn.messages) != 1 {
-		t.Fatalf("Expected 1 message, got %d", len(conn.messages))
-	}
-
-	// Decode using a buffered reader (as we do in actual code)
-	reader := bufio.NewReaderSize(conn, GetDTLSReadBufferSize())
-	var decodedEnv Envelope
-	if err := codec.Decode(reader, &decodedEnv); err != nil {
-		t.Fatalf("Failed to decode StreamData: %v", err)
-	}
-
-	// Verify
-	if decodedEnv.Type != MessageTypeStreamData {
-		t.Errorf("Type mismatch: got %v, want %v", decodedEnv.Type, MessageTypeStreamData)
-	}
-	if decodedEnv.StreamData == nil {
-		t.Fatal("StreamData is nil")
-	}
-	if decodedEnv.StreamData.ID != testEnv.StreamData.ID {
-		t.Errorf("StreamID mismatch: got %v, want %v", decodedEnv.StreamData.ID, testEnv.StreamData.ID)
-	}
-	if decodedEnv.StreamData.Seq != testEnv.StreamData.Seq {
-		t.Errorf("Seq mismatch: got %v, want %v", decodedEnv.StreamData.Seq, testEnv.StreamData.Seq)
-	}
-	if !bytes.Equal(decodedEnv.StreamData.Data, testEnv.StreamData.Data) {
-		t.Errorf("Data mismatch: got %v, want %v", decodedEnv.StreamData.Data, testEnv.StreamData.Data)
-	}
-}
-
-// TestProtobufCodecMultipleMessages tests encoding/decoding multiple messages
-func TestProtobufCodecMultipleMessages(t *testing.T) {
-	codec := protobufCodec{}
-	conn := newMockDatagramConn()
-
-	// Create multiple test envelopes
-	envelopes := []*Envelope{
-		{
-			Type: MessageTypeStreamOpen,
-			StreamOpen: &StreamOpen{
-				ID:         StreamID("stream-1"),
-				Service:    "test-service",
-				TargetAddr: "127.0.0.1:8080",
-			},
-		},
-		{
-			Type: MessageTypeStreamData,
-			StreamData: &StreamData{
-				ID:   StreamID("stream-1"),
-				Seq:  1,
-				Data: []byte("first chunk"),
-			},
-		},
-		{
-			Type: MessageTypeStreamData,
-			StreamData: &StreamData{
-				ID:   StreamID("stream-1"),
-				Seq:  2,
-				Data: []byte("second chunk"),
-			},
-		},
-		{
-			Type: MessageTypeStreamClose,
-			StreamClose: &StreamClose{
-				ID:    StreamID("stream-1"),
-				Error: "",
-			},
-		},
-	}
-
-	// Encode all messages
-	for i, env := range envelopes {
-		if err := codec.Encode(conn, env); err != nil {
-			t.Fatalf("Failed to encode message %d: %v", i, err)
-		}
-	}
-
-	// Verify that each encode produced exactly one message
-	if len(conn.messages) != len(envelopes) {
-		t.Fatalf("Expected %d messages, got %d", len(envelopes), len(conn.messages))
-	}
-
-	// Decode and verify all messages using a buffered reader (as we do in actual code)
-	reader := bufio.NewReaderSize(conn, GetDTLSReadBufferSize())
-	for i := 0; i < len(envelopes); i++ {
-		var decoded Envelope
-		if err := codec.Decode(reader, &decoded); err != nil {
-			t.Fatalf("Failed to decode message %d: %v", i, err)
-		}
-		if decoded.Type != envelopes[i].Type {
-			t.Errorf("Message %d type mismatch: got %v, want %v", i, decoded.Type, envelopes[i].Type)
-		}
-	}
-}

internal/protocol/hopgate_stream.proto

@@ -1,103 +0,0 @@
-syntax = "proto3";
-
-package hopgate.protocol.v1;
-
-option go_package = "internal/protocol/pb;pb";
-
-// HeaderValues 는 HTTP 헤더의 다중 값 표현을 위한 래퍼입니다.
-// HeaderValues wraps multiple header values for a single HTTP header key.
-message HeaderValues {
-  repeated string values = 1;
-}
-
-// Request 는 DTLS 터널 위에서 교환되는 HTTP 요청을 표현합니다.
-// This mirrors internal/protocol.Request.
-message Request {
-  string request_id   = 1;
-  string client_id    = 2;  // optional client identifier
-  string service_name = 3;  // logical service name on the client side
-
-  string method = 4;
-  string url    = 5;
-
-  // HTTP header: map of key -> multiple values.
-  map<string, HeaderValues> header = 6;
-
-  // Raw HTTP body bytes.
-  bytes body = 7;
-}
-
-// Response 는 DTLS 터널 위에서 교환되는 HTTP 응답을 표현합니다.
-// This mirrors internal/protocol.Response.
-message Response {
-  string request_id = 1;
-  int32  status     = 2;
-
-  // HTTP header.
-  map<string, HeaderValues> header = 3;
-
-  // Raw HTTP body bytes.
-  bytes body = 4;
-
-  // Optional error description when tunneling fails.
-  string error = 5;
-}
-
-// StreamOpen 은 새로운 스트림(HTTP 요청/응답, WebSocket 등)을 여는 메시지입니다.
-// This represents opening a new stream (HTTP request/response, WebSocket, etc.).
-message StreamOpen {
-  string id = 1; // StreamID (text form)
-
-  // Which logical service / local target to use on the client side.
-  string service_name = 2;
-  string target_addr  = 3; // e.g. "127.0.0.1:8080"
-
-  // Initial HTTP-like headers (including Upgrade, etc.).
-  map<string, HeaderValues> header = 4;
-}
-
-// StreamData 는 이미 열린 스트림에 대한 단방향 데이터 프레임입니다.
-// This is a unidirectional data frame on an already-open stream.
-message StreamData {
-  string id  = 1; // StreamID
-  uint64 seq = 2; // per-stream sequence number starting from 0
-  bytes  data = 3;
-}
-
-// StreamAck 는 StreamData 에 대한 ACK/NACK 및 선택적 재전송 힌트를 전달합니다.
-// This conveys ACK/NACK and optional retransmission hints for StreamData.
-message StreamAck {
-  string id = 1;
-
-  // Last contiguously received sequence number (starting from 0).
-  uint64 ack_seq = 2;
-
-  // Additional missing sequence numbers beyond ack_seq (optional).
-  repeated uint64 lost_seqs = 3;
-
-  // Optional receive window size hint.
-  uint32 window_size = 4;
-}
-
-// StreamClose 는 스트림 종료(정상/에러)를 알립니다.
-// This indicates normal or error termination of a stream.
-message StreamClose {
-  string id    = 1;
-  string error = 2; // empty means normal close
-}
-
-// Envelope 는 DTLS 세션 위에서 교환되는 상위 레벨 메시지 컨테이너입니다.
-// 하나의 Envelope 에는 HTTP 요청/응답 또는 스트림 관련 메시지 중 하나만 포함됩니다.
-// Envelope is the top-level container exchanged over the DTLS session.
-// Exactly one payload (http_request/http_response/stream_*) is set per message.
-message Envelope {
-  oneof payload {
-    Request    http_request  = 1;
-    Response   http_response = 2;
-
-    StreamOpen  stream_open  = 3;
-    StreamData  stream_data  = 4;
-    StreamClose stream_close = 5;
-    StreamAck   stream_ack   = 6;
-  }
-}

internal/protocol/pb/hopgate_stream.pb.go

@@ -1,799 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.36.10
-// 	protoc        v6.33.1
-// source: internal/protocol/hopgate_stream.proto
-
-package pb
-
-import (
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	reflect "reflect"
-	sync "sync"
-	unsafe "unsafe"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-// HeaderValues 는 HTTP 헤더의 다중 값 표현을 위한 래퍼입니다.
-// HeaderValues wraps multiple header values for a single HTTP header key.
-type HeaderValues struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	Values        []string               `protobuf:"bytes,1,rep,name=values,proto3" json:"values,omitempty"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *HeaderValues) Reset() {
-	*x = HeaderValues{}
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[0]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *HeaderValues) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*HeaderValues) ProtoMessage() {}
-
-func (x *HeaderValues) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[0]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use HeaderValues.ProtoReflect.Descriptor instead.
-func (*HeaderValues) Descriptor() ([]byte, []int) {
-	return file_internal_protocol_hopgate_stream_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *HeaderValues) GetValues() []string {
-	if x != nil {
-		return x.Values
-	}
-	return nil
-}
-
-// Request 는 DTLS 터널 위에서 교환되는 HTTP 요청을 표현합니다.
-// This mirrors internal/protocol.Request.
-type Request struct {
-	state       protoimpl.MessageState `protogen:"open.v1"`
-	RequestId   string                 `protobuf:"bytes,1,opt,name=request_id,json=requestId,proto3" json:"request_id,omitempty"`
-	ClientId    string                 `protobuf:"bytes,2,opt,name=client_id,json=clientId,proto3" json:"client_id,omitempty"`          // optional client identifier
-	ServiceName string                 `protobuf:"bytes,3,opt,name=service_name,json=serviceName,proto3" json:"service_name,omitempty"` // logical service name on the client side
-	Method      string                 `protobuf:"bytes,4,opt,name=method,proto3" json:"method,omitempty"`
-	Url         string                 `protobuf:"bytes,5,opt,name=url,proto3" json:"url,omitempty"`
-	// HTTP header: map of key -> multiple values.
-	Header map[string]*HeaderValues `protobuf:"bytes,6,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
-	// Raw HTTP body bytes.
-	Body          []byte `protobuf:"bytes,7,opt,name=body,proto3" json:"body,omitempty"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *Request) Reset() {
-	*x = Request{}
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[1]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *Request) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Request) ProtoMessage() {}
-
-func (x *Request) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[1]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Request.ProtoReflect.Descriptor instead.
-func (*Request) Descriptor() ([]byte, []int) {
-	return file_internal_protocol_hopgate_stream_proto_rawDescGZIP(), []int{1}
-}
-
-func (x *Request) GetRequestId() string {
-	if x != nil {
-		return x.RequestId
-	}
-	return ""
-}
-
-func (x *Request) GetClientId() string {
-	if x != nil {
-		return x.ClientId
-	}
-	return ""
-}
-
-func (x *Request) GetServiceName() string {
-	if x != nil {
-		return x.ServiceName
-	}
-	return ""
-}
-
-func (x *Request) GetMethod() string {
-	if x != nil {
-		return x.Method
-	}
-	return ""
-}
-
-func (x *Request) GetUrl() string {
-	if x != nil {
-		return x.Url
-	}
-	return ""
-}
-
-func (x *Request) GetHeader() map[string]*HeaderValues {
-	if x != nil {
-		return x.Header
-	}
-	return nil
-}
-
-func (x *Request) GetBody() []byte {
-	if x != nil {
-		return x.Body
-	}
-	return nil
-}
-
-// Response 는 DTLS 터널 위에서 교환되는 HTTP 응답을 표현합니다.
-// This mirrors internal/protocol.Response.
-type Response struct {
-	state     protoimpl.MessageState `protogen:"open.v1"`
-	RequestId string                 `protobuf:"bytes,1,opt,name=request_id,json=requestId,proto3" json:"request_id,omitempty"`
-	Status    int32                  `protobuf:"varint,2,opt,name=status,proto3" json:"status,omitempty"`
-	// HTTP header.
-	Header map[string]*HeaderValues `protobuf:"bytes,3,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
-	// Raw HTTP body bytes.
-	Body []byte `protobuf:"bytes,4,opt,name=body,proto3" json:"body,omitempty"`
-	// Optional error description when tunneling fails.
-	Error         string `protobuf:"bytes,5,opt,name=error,proto3" json:"error,omitempty"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *Response) Reset() {
-	*x = Response{}
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[2]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *Response) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Response) ProtoMessage() {}
-
-func (x *Response) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[2]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Response.ProtoReflect.Descriptor instead.
-func (*Response) Descriptor() ([]byte, []int) {
-	return file_internal_protocol_hopgate_stream_proto_rawDescGZIP(), []int{2}
-}
-
-func (x *Response) GetRequestId() string {
-	if x != nil {
-		return x.RequestId
-	}
-	return ""
-}
-
-func (x *Response) GetStatus() int32 {
-	if x != nil {
-		return x.Status
-	}
-	return 0
-}
-
-func (x *Response) GetHeader() map[string]*HeaderValues {
-	if x != nil {
-		return x.Header
-	}
-	return nil
-}
-
-func (x *Response) GetBody() []byte {
-	if x != nil {
-		return x.Body
-	}
-	return nil
-}
-
-func (x *Response) GetError() string {
-	if x != nil {
-		return x.Error
-	}
-	return ""
-}
-
-// StreamOpen 은 새로운 스트림(HTTP 요청/응답, WebSocket 등)을 여는 메시지입니다.
-// This represents opening a new stream (HTTP request/response, WebSocket, etc.).
-type StreamOpen struct {
-	state protoimpl.MessageState `protogen:"open.v1"`
-	Id    string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"` // StreamID (text form)
-	// Which logical service / local target to use on the client side.
-	ServiceName string `protobuf:"bytes,2,opt,name=service_name,json=serviceName,proto3" json:"service_name,omitempty"`
-	TargetAddr  string `protobuf:"bytes,3,opt,name=target_addr,json=targetAddr,proto3" json:"target_addr,omitempty"` // e.g. "127.0.0.1:8080"
-	// Initial HTTP-like headers (including Upgrade, etc.).
-	Header        map[string]*HeaderValues `protobuf:"bytes,4,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *StreamOpen) Reset() {
-	*x = StreamOpen{}
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[3]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *StreamOpen) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*StreamOpen) ProtoMessage() {}
-
-func (x *StreamOpen) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[3]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use StreamOpen.ProtoReflect.Descriptor instead.
-func (*StreamOpen) Descriptor() ([]byte, []int) {
-	return file_internal_protocol_hopgate_stream_proto_rawDescGZIP(), []int{3}
-}
-
-func (x *StreamOpen) GetId() string {
-	if x != nil {
-		return x.Id
-	}
-	return ""
-}
-
-func (x *StreamOpen) GetServiceName() string {
-	if x != nil {
-		return x.ServiceName
-	}
-	return ""
-}
-
-func (x *StreamOpen) GetTargetAddr() string {
-	if x != nil {
-		return x.TargetAddr
-	}
-	return ""
-}
-
-func (x *StreamOpen) GetHeader() map[string]*HeaderValues {
-	if x != nil {
-		return x.Header
-	}
-	return nil
-}
-
-// StreamData 는 이미 열린 스트림에 대한 단방향 데이터 프레임입니다.
-// This is a unidirectional data frame on an already-open stream.
-type StreamData struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	Id            string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`    // StreamID
-	Seq           uint64                 `protobuf:"varint,2,opt,name=seq,proto3" json:"seq,omitempty"` // per-stream sequence number starting from 0
-	Data          []byte                 `protobuf:"bytes,3,opt,name=data,proto3" json:"data,omitempty"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *StreamData) Reset() {
-	*x = StreamData{}
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[4]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *StreamData) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*StreamData) ProtoMessage() {}
-
-func (x *StreamData) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[4]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use StreamData.ProtoReflect.Descriptor instead.
-func (*StreamData) Descriptor() ([]byte, []int) {
-	return file_internal_protocol_hopgate_stream_proto_rawDescGZIP(), []int{4}
-}
-
-func (x *StreamData) GetId() string {
-	if x != nil {
-		return x.Id
-	}
-	return ""
-}
-
-func (x *StreamData) GetSeq() uint64 {
-	if x != nil {
-		return x.Seq
-	}
-	return 0
-}
-
-func (x *StreamData) GetData() []byte {
-	if x != nil {
-		return x.Data
-	}
-	return nil
-}
-
-// StreamAck 는 StreamData 에 대한 ACK/NACK 및 선택적 재전송 힌트를 전달합니다.
-// This conveys ACK/NACK and optional retransmission hints for StreamData.
-type StreamAck struct {
-	state protoimpl.MessageState `protogen:"open.v1"`
-	Id    string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	// Last contiguously received sequence number (starting from 0).
-	AckSeq uint64 `protobuf:"varint,2,opt,name=ack_seq,json=ackSeq,proto3" json:"ack_seq,omitempty"`
-	// Additional missing sequence numbers beyond ack_seq (optional).
-	LostSeqs []uint64 `protobuf:"varint,3,rep,packed,name=lost_seqs,json=lostSeqs,proto3" json:"lost_seqs,omitempty"`
-	// Optional receive window size hint.
-	WindowSize    uint32 `protobuf:"varint,4,opt,name=window_size,json=windowSize,proto3" json:"window_size,omitempty"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *StreamAck) Reset() {
-	*x = StreamAck{}
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[5]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *StreamAck) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*StreamAck) ProtoMessage() {}
-
-func (x *StreamAck) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[5]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use StreamAck.ProtoReflect.Descriptor instead.
-func (*StreamAck) Descriptor() ([]byte, []int) {
-	return file_internal_protocol_hopgate_stream_proto_rawDescGZIP(), []int{5}
-}
-
-func (x *StreamAck) GetId() string {
-	if x != nil {
-		return x.Id
-	}
-	return ""
-}
-
-func (x *StreamAck) GetAckSeq() uint64 {
-	if x != nil {
-		return x.AckSeq
-	}
-	return 0
-}
-
-func (x *StreamAck) GetLostSeqs() []uint64 {
-	if x != nil {
-		return x.LostSeqs
-	}
-	return nil
-}
-
-func (x *StreamAck) GetWindowSize() uint32 {
-	if x != nil {
-		return x.WindowSize
-	}
-	return 0
-}
-
-// StreamClose 는 스트림 종료(정상/에러)를 알립니다.
-// This indicates normal or error termination of a stream.
-type StreamClose struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	Id            string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	Error         string                 `protobuf:"bytes,2,opt,name=error,proto3" json:"error,omitempty"` // empty means normal close
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *StreamClose) Reset() {
-	*x = StreamClose{}
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[6]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *StreamClose) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*StreamClose) ProtoMessage() {}
-
-func (x *StreamClose) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[6]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use StreamClose.ProtoReflect.Descriptor instead.
-func (*StreamClose) Descriptor() ([]byte, []int) {
-	return file_internal_protocol_hopgate_stream_proto_rawDescGZIP(), []int{6}
-}
-
-func (x *StreamClose) GetId() string {
-	if x != nil {
-		return x.Id
-	}
-	return ""
-}
-
-func (x *StreamClose) GetError() string {
-	if x != nil {
-		return x.Error
-	}
-	return ""
-}
-
-// Envelope 는 DTLS 세션 위에서 교환되는 상위 레벨 메시지 컨테이너입니다.
-// 하나의 Envelope 에는 HTTP 요청/응답 또는 스트림 관련 메시지 중 하나만 포함됩니다.
-// Envelope is the top-level container exchanged over the DTLS session.
-// Exactly one payload (http_request/http_response/stream_*) is set per message.
-type Envelope struct {
-	state protoimpl.MessageState `protogen:"open.v1"`
-	// Types that are valid to be assigned to Payload:
-	//
-	//	*Envelope_HttpRequest
-	//	*Envelope_HttpResponse
-	//	*Envelope_StreamOpen
-	//	*Envelope_StreamData
-	//	*Envelope_StreamClose
-	//	*Envelope_StreamAck
-	Payload       isEnvelope_Payload `protobuf_oneof:"payload"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *Envelope) Reset() {
-	*x = Envelope{}
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[7]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *Envelope) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Envelope) ProtoMessage() {}
-
-func (x *Envelope) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_protocol_hopgate_stream_proto_msgTypes[7]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Envelope.ProtoReflect.Descriptor instead.
-func (*Envelope) Descriptor() ([]byte, []int) {
-	return file_internal_protocol_hopgate_stream_proto_rawDescGZIP(), []int{7}
-}
-
-func (x *Envelope) GetPayload() isEnvelope_Payload {
-	if x != nil {
-		return x.Payload
-	}
-	return nil
-}
-
-func (x *Envelope) GetHttpRequest() *Request {
-	if x != nil {
-		if x, ok := x.Payload.(*Envelope_HttpRequest); ok {
-			return x.HttpRequest
-		}
-	}
-	return nil
-}
-
-func (x *Envelope) GetHttpResponse() *Response {
-	if x != nil {
-		if x, ok := x.Payload.(*Envelope_HttpResponse); ok {
-			return x.HttpResponse
-		}
-	}
-	return nil
-}
-
-func (x *Envelope) GetStreamOpen() *StreamOpen {
-	if x != nil {
-		if x, ok := x.Payload.(*Envelope_StreamOpen); ok {
-			return x.StreamOpen
-		}
-	}
-	return nil
-}
-
-func (x *Envelope) GetStreamData() *StreamData {
-	if x != nil {
-		if x, ok := x.Payload.(*Envelope_StreamData); ok {
-			return x.StreamData
-		}
-	}
-	return nil
-}
-
-func (x *Envelope) GetStreamClose() *StreamClose {
-	if x != nil {
-		if x, ok := x.Payload.(*Envelope_StreamClose); ok {
-			return x.StreamClose
-		}
-	}
-	return nil
-}
-
-func (x *Envelope) GetStreamAck() *StreamAck {
-	if x != nil {
-		if x, ok := x.Payload.(*Envelope_StreamAck); ok {
-			return x.StreamAck
-		}
-	}
-	return nil
-}
-
-type isEnvelope_Payload interface {
-	isEnvelope_Payload()
-}
-
-type Envelope_HttpRequest struct {
-	HttpRequest *Request `protobuf:"bytes,1,opt,name=http_request,json=httpRequest,proto3,oneof"`
-}
-
-type Envelope_HttpResponse struct {
-	HttpResponse *Response `protobuf:"bytes,2,opt,name=http_response,json=httpResponse,proto3,oneof"`
-}
-
-type Envelope_StreamOpen struct {
-	StreamOpen *StreamOpen `protobuf:"bytes,3,opt,name=stream_open,json=streamOpen,proto3,oneof"`
-}
-
-type Envelope_StreamData struct {
-	StreamData *StreamData `protobuf:"bytes,4,opt,name=stream_data,json=streamData,proto3,oneof"`
-}
-
-type Envelope_StreamClose struct {
-	StreamClose *StreamClose `protobuf:"bytes,5,opt,name=stream_close,json=streamClose,proto3,oneof"`
-}
-
-type Envelope_StreamAck struct {
-	StreamAck *StreamAck `protobuf:"bytes,6,opt,name=stream_ack,json=streamAck,proto3,oneof"`
-}
-
-func (*Envelope_HttpRequest) isEnvelope_Payload() {}
-
-func (*Envelope_HttpResponse) isEnvelope_Payload() {}
-
-func (*Envelope_StreamOpen) isEnvelope_Payload() {}
-
-func (*Envelope_StreamData) isEnvelope_Payload() {}
-
-func (*Envelope_StreamClose) isEnvelope_Payload() {}
-
-func (*Envelope_StreamAck) isEnvelope_Payload() {}
-
-var File_internal_protocol_hopgate_stream_proto protoreflect.FileDescriptor
-
-const file_internal_protocol_hopgate_stream_proto_rawDesc = "" +
-	"\n" +
-	"&internal/protocol/hopgate_stream.proto\x12\x13hopgate.protocol.v1\"&\n" +
-	"\fHeaderValues\x12\x16\n" +
-	"\x06values\x18\x01 \x03(\tR\x06values\"\xc6\x02\n" +
-	"\aRequest\x12\x1d\n" +
-	"\n" +
-	"request_id\x18\x01 \x01(\tR\trequestId\x12\x1b\n" +
-	"\tclient_id\x18\x02 \x01(\tR\bclientId\x12!\n" +
-	"\fservice_name\x18\x03 \x01(\tR\vserviceName\x12\x16\n" +
-	"\x06method\x18\x04 \x01(\tR\x06method\x12\x10\n" +
-	"\x03url\x18\x05 \x01(\tR\x03url\x12@\n" +
-	"\x06header\x18\x06 \x03(\v2(.hopgate.protocol.v1.Request.HeaderEntryR\x06header\x12\x12\n" +
-	"\x04body\x18\a \x01(\fR\x04body\x1a\\\n" +
-	"\vHeaderEntry\x12\x10\n" +
-	"\x03key\x18\x01 \x01(\tR\x03key\x127\n" +
-	"\x05value\x18\x02 \x01(\v2!.hopgate.protocol.v1.HeaderValuesR\x05value:\x028\x01\"\x8c\x02\n" +
-	"\bResponse\x12\x1d\n" +
-	"\n" +
-	"request_id\x18\x01 \x01(\tR\trequestId\x12\x16\n" +
-	"\x06status\x18\x02 \x01(\x05R\x06status\x12A\n" +
-	"\x06header\x18\x03 \x03(\v2).hopgate.protocol.v1.Response.HeaderEntryR\x06header\x12\x12\n" +
-	"\x04body\x18\x04 \x01(\fR\x04body\x12\x14\n" +
-	"\x05error\x18\x05 \x01(\tR\x05error\x1a\\\n" +
-	"\vHeaderEntry\x12\x10\n" +
-	"\x03key\x18\x01 \x01(\tR\x03key\x127\n" +
-	"\x05value\x18\x02 \x01(\v2!.hopgate.protocol.v1.HeaderValuesR\x05value:\x028\x01\"\x83\x02\n" +
-	"\n" +
-	"StreamOpen\x12\x0e\n" +
-	"\x02id\x18\x01 \x01(\tR\x02id\x12!\n" +
-	"\fservice_name\x18\x02 \x01(\tR\vserviceName\x12\x1f\n" +
-	"\vtarget_addr\x18\x03 \x01(\tR\n" +
-	"targetAddr\x12C\n" +
-	"\x06header\x18\x04 \x03(\v2+.hopgate.protocol.v1.StreamOpen.HeaderEntryR\x06header\x1a\\\n" +
-	"\vHeaderEntry\x12\x10\n" +
-	"\x03key\x18\x01 \x01(\tR\x03key\x127\n" +
-	"\x05value\x18\x02 \x01(\v2!.hopgate.protocol.v1.HeaderValuesR\x05value:\x028\x01\"B\n" +
-	"\n" +
-	"StreamData\x12\x0e\n" +
-	"\x02id\x18\x01 \x01(\tR\x02id\x12\x10\n" +
-	"\x03seq\x18\x02 \x01(\x04R\x03seq\x12\x12\n" +
-	"\x04data\x18\x03 \x01(\fR\x04data\"r\n" +
-	"\tStreamAck\x12\x0e\n" +
-	"\x02id\x18\x01 \x01(\tR\x02id\x12\x17\n" +
-	"\aack_seq\x18\x02 \x01(\x04R\x06ackSeq\x12\x1b\n" +
-	"\tlost_seqs\x18\x03 \x03(\x04R\blostSeqs\x12\x1f\n" +
-	"\vwindow_size\x18\x04 \x01(\rR\n" +
-	"windowSize\"3\n" +
-	"\vStreamClose\x12\x0e\n" +
-	"\x02id\x18\x01 \x01(\tR\x02id\x12\x14\n" +
-	"\x05error\x18\x02 \x01(\tR\x05error\"\xae\x03\n" +
-	"\bEnvelope\x12A\n" +
-	"\fhttp_request\x18\x01 \x01(\v2\x1c.hopgate.protocol.v1.RequestH\x00R\vhttpRequest\x12D\n" +
-	"\rhttp_response\x18\x02 \x01(\v2\x1d.hopgate.protocol.v1.ResponseH\x00R\fhttpResponse\x12B\n" +
-	"\vstream_open\x18\x03 \x01(\v2\x1f.hopgate.protocol.v1.StreamOpenH\x00R\n" +
-	"streamOpen\x12B\n" +
-	"\vstream_data\x18\x04 \x01(\v2\x1f.hopgate.protocol.v1.StreamDataH\x00R\n" +
-	"streamData\x12E\n" +
-	"\fstream_close\x18\x05 \x01(\v2 .hopgate.protocol.v1.StreamCloseH\x00R\vstreamClose\x12?\n" +
-	"\n" +
-	"stream_ack\x18\x06 \x01(\v2\x1e.hopgate.protocol.v1.StreamAckH\x00R\tstreamAckB\t\n" +
-	"\apayloadB\x19Z\x17internal/protocol/pb;pbb\x06proto3"
-
-var (
-	file_internal_protocol_hopgate_stream_proto_rawDescOnce sync.Once
-	file_internal_protocol_hopgate_stream_proto_rawDescData []byte
-)
-
-func file_internal_protocol_hopgate_stream_proto_rawDescGZIP() []byte {
-	file_internal_protocol_hopgate_stream_proto_rawDescOnce.Do(func() {
-		file_internal_protocol_hopgate_stream_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_internal_protocol_hopgate_stream_proto_rawDesc), len(file_internal_protocol_hopgate_stream_proto_rawDesc)))
-	})
-	return file_internal_protocol_hopgate_stream_proto_rawDescData
-}
-
-var file_internal_protocol_hopgate_stream_proto_msgTypes = make([]protoimpl.MessageInfo, 11)
-var file_internal_protocol_hopgate_stream_proto_goTypes = []any{
-	(*HeaderValues)(nil), // 0: hopgate.protocol.v1.HeaderValues
-	(*Request)(nil),      // 1: hopgate.protocol.v1.Request
-	(*Response)(nil),     // 2: hopgate.protocol.v1.Response
-	(*StreamOpen)(nil),   // 3: hopgate.protocol.v1.StreamOpen
-	(*StreamData)(nil),   // 4: hopgate.protocol.v1.StreamData
-	(*StreamAck)(nil),    // 5: hopgate.protocol.v1.StreamAck
-	(*StreamClose)(nil),  // 6: hopgate.protocol.v1.StreamClose
-	(*Envelope)(nil),     // 7: hopgate.protocol.v1.Envelope
-	nil,                  // 8: hopgate.protocol.v1.Request.HeaderEntry
-	nil,                  // 9: hopgate.protocol.v1.Response.HeaderEntry
-	nil,                  // 10: hopgate.protocol.v1.StreamOpen.HeaderEntry
-}
-var file_internal_protocol_hopgate_stream_proto_depIdxs = []int32{
-	8,  // 0: hopgate.protocol.v1.Request.header:type_name -> hopgate.protocol.v1.Request.HeaderEntry
-	9,  // 1: hopgate.protocol.v1.Response.header:type_name -> hopgate.protocol.v1.Response.HeaderEntry
-	10, // 2: hopgate.protocol.v1.StreamOpen.header:type_name -> hopgate.protocol.v1.StreamOpen.HeaderEntry
-	1,  // 3: hopgate.protocol.v1.Envelope.http_request:type_name -> hopgate.protocol.v1.Request
-	2,  // 4: hopgate.protocol.v1.Envelope.http_response:type_name -> hopgate.protocol.v1.Response
-	3,  // 5: hopgate.protocol.v1.Envelope.stream_open:type_name -> hopgate.protocol.v1.StreamOpen
-	4,  // 6: hopgate.protocol.v1.Envelope.stream_data:type_name -> hopgate.protocol.v1.StreamData
-	6,  // 7: hopgate.protocol.v1.Envelope.stream_close:type_name -> hopgate.protocol.v1.StreamClose
-	5,  // 8: hopgate.protocol.v1.Envelope.stream_ack:type_name -> hopgate.protocol.v1.StreamAck
-	0,  // 9: hopgate.protocol.v1.Request.HeaderEntry.value:type_name -> hopgate.protocol.v1.HeaderValues
-	0,  // 10: hopgate.protocol.v1.Response.HeaderEntry.value:type_name -> hopgate.protocol.v1.HeaderValues
-	0,  // 11: hopgate.protocol.v1.StreamOpen.HeaderEntry.value:type_name -> hopgate.protocol.v1.HeaderValues
-	12, // [12:12] is the sub-list for method output_type
-	12, // [12:12] is the sub-list for method input_type
-	12, // [12:12] is the sub-list for extension type_name
-	12, // [12:12] is the sub-list for extension extendee
-	0,  // [0:12] is the sub-list for field type_name
-}
-
-func init() { file_internal_protocol_hopgate_stream_proto_init() }
-func file_internal_protocol_hopgate_stream_proto_init() {
-	if File_internal_protocol_hopgate_stream_proto != nil {
-		return
-	}
-	file_internal_protocol_hopgate_stream_proto_msgTypes[7].OneofWrappers = []any{
-		(*Envelope_HttpRequest)(nil),
-		(*Envelope_HttpResponse)(nil),
-		(*Envelope_StreamOpen)(nil),
-		(*Envelope_StreamData)(nil),
-		(*Envelope_StreamClose)(nil),
-		(*Envelope_StreamAck)(nil),
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: unsafe.Slice(unsafe.StringData(file_internal_protocol_hopgate_stream_proto_rawDesc), len(file_internal_protocol_hopgate_stream_proto_rawDesc)),
-			NumEnums:      0,
-			NumMessages:   11,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_internal_protocol_hopgate_stream_proto_goTypes,
-		DependencyIndexes: file_internal_protocol_hopgate_stream_proto_depIdxs,
-		MessageInfos:      file_internal_protocol_hopgate_stream_proto_msgTypes,
-	}.Build()
-	File_internal_protocol_hopgate_stream_proto = out.File
-	file_internal_protocol_hopgate_stream_proto_goTypes = nil
-	file_internal_protocol_hopgate_stream_proto_depIdxs = nil
-}

internal/protocol/pb/hopgate_stream_grpc.go

@@ -1,119 +0,0 @@
-package pb
-
-import (
-	"context"
-
-	"google.golang.org/grpc"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
-)
-
-// HopGateTunnelClient is the client API for the HopGateTunnel service.
-type HopGateTunnelClient interface {
-	// OpenTunnel establishes a long-lived bi-directional stream between
-	// a HopGate client and the server. Both HTTP requests and responses
-	// are multiplexed as Envelope messages on this stream.
-	OpenTunnel(ctx context.Context, opts ...grpc.CallOption) (HopGateTunnel_OpenTunnelClient, error)
-}
-
-type hopGateTunnelClient struct {
-	cc grpc.ClientConnInterface
-}
-
-// NewHopGateTunnelClient creates a new HopGateTunnelClient.
-func NewHopGateTunnelClient(cc grpc.ClientConnInterface) HopGateTunnelClient {
-	return &hopGateTunnelClient{cc: cc}
-}
-
-func (c *hopGateTunnelClient) OpenTunnel(ctx context.Context, opts ...grpc.CallOption) (HopGateTunnel_OpenTunnelClient, error) {
-	stream, err := c.cc.NewStream(ctx, &_HopGateTunnel_serviceDesc.Streams[0], "/hopgate.protocol.v1.HopGateTunnel/OpenTunnel", opts...)
-	if err != nil {
-		return nil, err
-	}
-	return &hopGateTunnelOpenTunnelClient{ClientStream: stream}, nil
-}
-
-// HopGateTunnel_OpenTunnelClient is the client-side stream for OpenTunnel.
-type HopGateTunnel_OpenTunnelClient interface {
-	Send(*Envelope) error
-	Recv() (*Envelope, error)
-	grpc.ClientStream
-}
-
-type hopGateTunnelOpenTunnelClient struct {
-	grpc.ClientStream
-}
-
-func (x *hopGateTunnelOpenTunnelClient) Send(m *Envelope) error {
-	return x.ClientStream.SendMsg(m)
-}
-
-func (x *hopGateTunnelOpenTunnelClient) Recv() (*Envelope, error) {
-	m := new(Envelope)
-	if err := x.ClientStream.RecvMsg(m); err != nil {
-		return nil, err
-	}
-	return m, nil
-}
-
-// HopGateTunnelServer is the server API for the HopGateTunnel service.
-type HopGateTunnelServer interface {
-	// OpenTunnel handles a long-lived bi-directional stream between the server
-	// and a HopGate client. Implementations are responsible for reading and
-	// writing Envelope messages on the stream.
-	OpenTunnel(HopGateTunnel_OpenTunnelServer) error
-}
-
-// UnimplementedHopGateTunnelServer can be embedded to have forward compatible implementations.
-type UnimplementedHopGateTunnelServer struct{}
-
-// OpenTunnel returns an Unimplemented error by default.
-func (UnimplementedHopGateTunnelServer) OpenTunnel(HopGateTunnel_OpenTunnelServer) error {
-	return status.Errorf(codes.Unimplemented, "method OpenTunnel not implemented")
-}
-
-// RegisterHopGateTunnelServer registers the HopGateTunnel service with the given gRPC server.
-func RegisterHopGateTunnelServer(s grpc.ServiceRegistrar, srv HopGateTunnelServer) {
-	s.RegisterService(&_HopGateTunnel_serviceDesc, srv)
-}
-
-// HopGateTunnel_OpenTunnelServer is the server-side stream for OpenTunnel.
-type HopGateTunnel_OpenTunnelServer interface {
-	Send(*Envelope) error
-	Recv() (*Envelope, error)
-	grpc.ServerStream
-}
-
-func _HopGateTunnel_OpenTunnel_Handler(srv interface{}, stream grpc.ServerStream) error {
-	return srv.(HopGateTunnelServer).OpenTunnel(&hopGateTunnelOpenTunnelServer{ServerStream: stream})
-}
-
-type hopGateTunnelOpenTunnelServer struct {
-	grpc.ServerStream
-}
-
-func (x *hopGateTunnelOpenTunnelServer) Send(m *Envelope) error {
-	return x.ServerStream.SendMsg(m)
-}
-
-func (x *hopGateTunnelOpenTunnelServer) Recv() (*Envelope, error) {
-	m := new(Envelope)
-	if err := x.ServerStream.RecvMsg(m); err != nil {
-		return nil, err
-	}
-	return m, nil
-}
-
-var _HopGateTunnel_serviceDesc = grpc.ServiceDesc{
-	ServiceName: "hopgate.protocol.v1.HopGateTunnel",
-	HandlerType: (*HopGateTunnelServer)(nil),
-	Streams: []grpc.StreamDesc{
-		{
-			StreamName:    "OpenTunnel",
-			Handler:       _HopGateTunnel_OpenTunnel_Handler,
-			ServerStreams: true,
-			ClientStreams: true,
-		},
-	},
-	Metadata: "internal/protocol/hopgate_stream.proto",
-}

internal/protocol/protocol.go

@@ -1,147 +0,0 @@
-package protocol
-
-// Request 는 서버-클라이언트 간에 전달되는 HTTP 요청을 표현합니다.
-// 기존 HTTP 터널링 경로에서는 이 구조체를 그대로 사용합니다.
-type Request struct {
-	RequestID   string
-	ClientID    string // 대상 클라이언트 식별자
-	ServiceName string // 클라이언트 내부 서비스 이름
-
-	Method string
-	URL    string
-	Header map[string][]string
-	Body   []byte
-}
-
-// Response 는 서버-클라이언트 간에 전달되는 HTTP 응답을 표현합니다.
-// 기존 HTTP 터널링 경로에서는 이 구조체를 그대로 사용합니다.
-type Response struct {
-	RequestID string
-	Status    int
-	Header    map[string][]string
-	Body      []byte
-	Error     string // 에러 발생 시 설명 메시지
-}
-
-// --- 확장 가능 DTLS 메시지 Envelope 및 스트림 구조체 ---
-//
-// WebSocket/TCP 스트림 터널링을 지원하기 위해, 단일 HTTP 요청/응답 외에도
-// 스트림 기반 메시지를 운반할 수 있는 Envelope 타입을 정의합니다.
-// 현재 구현에서는 아직 사용하지 않으며, 향후 단계적으로 적용할 예정입니다.
-
-// MessageType 은 DTLS 위에서 교환되는 상위 레벨 메시지 종류를 나타냅니다.
-type MessageType string
-
-// StreamChunkSize 는 스트림 터널링 시 단일 StreamData 프레임에 담을 최대 payload 크기입니다.
-// 현재 구현에서는 4KiB 로 고정하여 DTLS/UDP MTU 한계를 여유 있게 피하도록 합니다.
-// StreamChunkSize is the maximum payload size per StreamData frame (4KiB).
-const StreamChunkSize = 4 * 1024
-
-const (
-	// MessageTypeHTTP 는 기존 단일 HTTP 요청/응답 메시지를 의미합니다.
-	// 이 경우 HTTPRequest / HTTPResponse 필드를 사용합니다.
-	MessageTypeHTTP MessageType = "http"
-
-	// MessageTypeStreamOpen 은 새로운 스트림(TCP/WebSocket 등)의 오픈을 의미합니다.
-	MessageTypeStreamOpen MessageType = "stream_open"
-
-	// MessageTypeStreamData 는 열린 스트림에 대한 양방향 데이터 프레임을 의미합니다.
-	// HTTP 바디 chunk 를 비롯한 실제 payload 는 이 타입을 통해 전송됩니다.
-	// Stream data frames for an already-opened stream (HTTP body chunks, etc.).
-	MessageTypeStreamData MessageType = "stream_data"
-
-	// MessageTypeStreamClose 는 스트림 종료(정상/에러)를 의미합니다.
-	// Normal or error-termination of a stream.
-	MessageTypeStreamClose MessageType = "stream_close"
-
-	// MessageTypeStreamAck 는 스트림 데이터 프레임에 대한 ACK/NACK 및 재전송 힌트를 전달합니다.
-	// Stream-level ACK/NACK frames for selective retransmission hints.
-	MessageTypeStreamAck MessageType = "stream_ack"
-)
-
-// Envelope 는 DTLS 세션 위에서 교환되는 상위 레벨 메시지 컨테이너입니다.
-// 하나의 Envelope 에는 HTTP 요청/응답 또는 스트림 관련 메시지 중 하나만 포함됩니다.
-type Envelope struct {
-	Type MessageType `json:"type"`
-
-	// HTTP 1회성 요청/응답 (기존 터널링 경로)
-	HTTPRequest  *Request  `json:"http_request,omitempty"`
-	HTTPResponse *Response `json:"http_response,omitempty"`
-
-	// 스트림 기반 메시지 (WebSocket/TCP 터널용)
-	StreamOpen  *StreamOpen  `json:"stream_open,omitempty"`
-	StreamData  *StreamData  `json:"stream_data,omitempty"`
-	StreamClose *StreamClose `json:"stream_close,omitempty"`
-
-	// 스트림 제어 메시지 (ACK/NACK, 재전송 힌트 등)
-	// Stream-level control messages (ACK/NACK, retransmission hints, etc.).
-	StreamAck *StreamAck `json:"stream_ack,omitempty"`
-}
-
-// StreamID 는 스트림(예: 특정 WebSocket 연결 또는 TCP 커넥션)을 구분하기 위한 식별자입니다.
-type StreamID string
-
-// HTTP-over-stream 터널링에서 사용되는 pseudo-header 키 상수입니다.
-// These pseudo-header keys are used when tunneling HTTP over the stream protocol.
-const (
-	HeaderKeyMethod = "X-HopGate-Method"
-	HeaderKeyURL    = "X-HopGate-URL"
-	HeaderKeyHost   = "X-HopGate-Host"
-	HeaderKeyStatus = "X-HopGate-Status"
-)
-
-// StreamOpen 은 새로운 스트림을 여는 요청을 나타냅니다.
-type StreamOpen struct {
-	ID StreamID `json:"id"`
-
-	// Service / TargetAddr 는 클라이언트 측에서 어느 로컬 서비스로 연결해야 하는지를 나타냅니다.
-	// 최소 구현에서는 LocalTarget 하나만 사용해도 되며, 추후 서비스별로 확장 가능합니다.
-	Service    string              `json:"service_name,omitempty"`
-	TargetAddr string              `json:"target_addr,omitempty"` // 예: "127.0.0.1:8080"
-	Header     map[string][]string `json:"header,omitempty"`      // 초기 HTTP 헤더(Upgrade 포함) 전달용
-}
-
-// StreamData 는 이미 열린 스트림에 대해 한 방향으로 전송되는 데이터 프레임을 표현합니다.
-// DTLS/UDP 특성상 손실/중복/순서 뒤바뀜을 감지하고 재전송할 수 있도록
-// 각 스트림 내에서 0부터 시작하는 시퀀스 번호(Seq)를 포함합니다.
-//
-// StreamData represents a unidirectional data frame on an already-opened stream.
-// To support loss/duplication/reordering detection and retransmission over DTLS/UDP,
-// it carries a per-stream sequence number (Seq) starting from 0.
-type StreamData struct {
-	ID   StreamID `json:"id"`
-	Seq  uint64   `json:"seq"`
-	Data []byte   `json:"data"`
-}
-
-// StreamAck 는 스트림 데이터 프레임에 대한 ACK/NACK 및 선택적 재전송 요청 정보를 전달합니다.
-// AckSeq 는 수신 측에서 "연속적으로" 수신 완료한 마지막 Seq 를 의미하며,
-// LostSeqs 는 그 이후 구간에서 누락된 시퀀스 번호(선택적)를 나타냅니다.
-//
-// StreamAck conveys ACK/NACK and optional retransmission hints for stream data frames.
-// AckSeq denotes the last sequence number received contiguously by the receiver,
-// while LostSeqs can list additional missing sequence numbers beyond AckSeq.
-type StreamAck struct {
-	ID StreamID `json:"id"`
-
-	// AckSeq 는 수신 측에서 0부터 시작해 연속으로 수신 완료한 마지막 Seq 입니다.
-	// AckSeq is the last contiguously received sequence number starting from 0.
-	AckSeq uint64 `json:"ack_seq"`
-
-	// LostSeqs 는 AckSeq 이후 구간에서 누락된 시퀀스 번호 목록입니다(선택).
-	// 이 필드는 선택적 selective retransmission 힌트를 제공하기 위해 사용됩니다.
-	//
-	// LostSeqs is an optional list of missing sequence numbers beyond AckSeq,
-	// used as a hint for selective retransmission.
-	LostSeqs []uint64 `json:"lost_seqs,omitempty"`
-
-	// WindowSize 는 수신 측이 허용 가능한 in-flight 프레임 수를 나타내는 선택적 힌트입니다.
-	// WindowSize is an optional hint for the allowed number of in-flight frames.
-	WindowSize uint32 `json:"window_size,omitempty"`
-}
-
-// StreamClose 는 스트림 종료를 알리는 메시지입니다.
-type StreamClose struct {
-	ID    StreamID `json:"id"`
-	Error string   `json:"error,omitempty"` // 비워두면 정상 종료로 해석
-}

internal/proxy/server.go

@@ -1,43 +0,0 @@
-package proxy
-
-import (
-	"context"
-	"net/http"
-
-	"golang.org/x/net/http2"
-)
-
-// ServerProxy 는 공인 HTTP(S) 엔드포인트에서 들어오는 요청을
-// 적절한 클라이언트로 라우팅하는 서버 측 프록시입니다.
-type ServerProxy struct {
-	Router     Router
-	HTTPServer *http.Server
-}
-
-// Router 는 도메인/패스 기준으로 어떤 클라이언트/서비스로 보낼지 결정하는 인터페이스입니다.
-type Router interface {
-	Route(req *http.Request) (clientID string, serviceName string, err error)
-}
-
-// NewHTTPServer 는 H1/H2 를 지원하는 기본 HTTP 서버를 생성합니다.
-func NewHTTPServer(addr string, handler http.Handler) *http.Server {
-	srv := &http.Server{
-		Addr:    addr,
-		Handler: handler,
-	}
-	http2.ConfigureServer(srv, &http2.Server{})
-	return srv
-}
-
-// Start / Shutdown 등은 추후 구현합니다.
-func (p *ServerProxy) Start(ctx context.Context) error {
-	// TODO: HTTP/HTTPS 리스너 시작 및 DTLS 연동
-	return nil
-}
-
-func (p *ServerProxy) Shutdown(ctx context.Context) error {
-	if p.HTTPServer != nil {
-		return p.HTTPServer.Shutdown(ctx)
-	}
-	return nil
-}

internal/tunnel/types.go

@@ -0,0 +1,8 @@
+package tunnel
+
+import "context"
+
+// DomainValidator validates the client credentials presented on the control stream.
+type DomainValidator interface {
+	ValidateDomainAPIKey(ctx context.Context, domain, clientAPIKey string) error
+}

internal/tunnel/yamux.go

@@ -0,0 +1,222 @@
+// Package tunnel provides the transport-neutral session used by HopGate.
+// The wire transport is TLS over TCP, while yamux supplies bidirectional
+// logical streams on top of the connection.
+package tunnel
+
+import (
+	"context"
+	"crypto/tls"
+	"encoding/binary"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"time"
+
+	"github.com/hashicorp/yamux"
+)
+
+const (
+	metadataHeaderSize = 4
+	maxMetadataSize    = 64 << 10
+)
+
+// StreamMeta describes what a logical stream carries. HTTP and WebSocket
+// streams use the same transport; only the metadata kind differs.
+type StreamMeta struct {
+	Kind    string              `json:"kind"`
+	Domain  string              `json:"domain,omitempty"`
+	Service string              `json:"service,omitempty"`
+	Method  string              `json:"method,omitempty"`
+	Path    string              `json:"path,omitempty"`
+	Host    string              `json:"host,omitempty"`
+	Headers map[string][]string `json:"headers,omitempty"`
+	Target  string              `json:"target,omitempty"`
+}
+
+// Stream is a yamux stream with one metadata record at its beginning.
+type Stream struct {
+	net.Conn
+	Meta StreamMeta
+}
+
+// Session is a bidirectional multiplexed tunnel.
+type Session struct {
+	inner *yamux.Session
+}
+
+func newSession(conn net.Conn, server bool) (*Session, error) {
+	if conn == nil {
+		return nil, errors.New("tunnel: nil connection")
+	}
+	config := yamux.DefaultConfig()
+	config.EnableKeepAlive = true
+	config.KeepAliveInterval = 30 * time.Second
+	config.ConnectionWriteTimeout = 10 * time.Second
+
+	var session *yamux.Session
+	var err error
+	if server {
+		session, err = yamux.Server(conn, config)
+	} else {
+		session, err = yamux.Client(conn, config)
+	}
+	if err != nil {
+		_ = conn.Close()
+		return nil, fmt.Errorf("tunnel: create yamux session: %w", err)
+	}
+	return &Session{inner: session}, nil
+}
+
+// NewClient wraps an already-established TLS or test connection.
+func NewClient(conn net.Conn) (*Session, error) { return newSession(conn, false) }
+
+// NewServer wraps an accepted TLS or test connection.
+func NewServer(conn net.Conn) (*Session, error) { return newSession(conn, true) }
+
+// DialTLS dials the server and establishes a TLS-protected yamux session.
+func DialTLS(ctx context.Context, address string, config *tls.Config) (*Session, error) {
+	if config == nil {
+		return nil, errors.New("tunnel: nil TLS config")
+	}
+	dialer := &tls.Dialer{NetDialer: &net.Dialer{Timeout: 10 * time.Second}, Config: config}
+	conn, err := dialer.DialContext(ctx, "tcp", address)
+	if err != nil {
+		return nil, fmt.Errorf("tunnel: TLS dial: %w", err)
+	}
+	return NewClient(conn)
+}
+
+// Open creates a stream and writes its metadata before returning it.
+func (s *Session) Open(ctx context.Context, meta StreamMeta) (*Stream, error) {
+	if s == nil || s.inner == nil {
+		return nil, errors.New("tunnel: session is closed")
+	}
+	if err := checkContext(ctx); err != nil {
+		return nil, err
+	}
+	conn, err := s.inner.Open()
+	if err != nil {
+		return nil, fmt.Errorf("tunnel: open stream: %w", err)
+	}
+	clearDeadline := true
+	defer func() {
+		if clearDeadline {
+			_ = conn.SetDeadline(time.Time{})
+		}
+	}()
+	if deadline, ok := ctxDeadline(ctx); ok {
+		if err := conn.SetDeadline(deadline); err != nil {
+			_ = conn.Close()
+			return nil, fmt.Errorf("tunnel: set stream deadline: %w", err)
+		}
+	}
+	if err := writeMeta(conn, meta); err != nil {
+		_ = conn.Close()
+		return nil, err
+	}
+	clearDeadline = false
+	_ = conn.SetDeadline(time.Time{})
+	return &Stream{Conn: conn, Meta: meta}, nil
+}
+
+// Accept waits for a peer-created stream and reads its metadata.
+func (s *Session) Accept(ctx context.Context) (*Stream, error) {
+	if s == nil || s.inner == nil {
+		return nil, errors.New("tunnel: session is closed")
+	}
+	if err := checkContext(ctx); err != nil {
+		return nil, err
+	}
+	conn, err := s.inner.Accept()
+	if err != nil {
+		return nil, fmt.Errorf("tunnel: accept stream: %w", err)
+	}
+	if deadline, ok := ctxDeadline(ctx); ok {
+		if err := conn.SetDeadline(deadline); err != nil {
+			_ = conn.Close()
+			return nil, fmt.Errorf("tunnel: set stream deadline: %w", err)
+		}
+	}
+	meta, err := readMeta(conn)
+	if err != nil {
+		_ = conn.Close()
+		return nil, err
+	}
+	_ = conn.SetDeadline(time.Time{})
+	return &Stream{Conn: conn, Meta: meta}, nil
+}
+
+func (s *Session) Close() error {
+	if s == nil || s.inner == nil {
+		return nil
+	}
+	return s.inner.Close()
+}
+
+// IsClosed reports whether the underlying yamux session has terminated.
+func (s *Session) IsClosed() bool {
+	return s == nil || s.inner == nil || s.inner.IsClosed()
+}
+
+func checkContext(ctx context.Context) error {
+	if ctx == nil {
+		return nil
+	}
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}
+
+func ctxDeadline(ctx context.Context) (time.Time, bool) {
+	if ctx == nil {
+		return time.Time{}, false
+	}
+	return ctx.Deadline()
+}
+
+func writeMeta(w io.Writer, meta StreamMeta) error {
+	data, err := json.Marshal(meta)
+	if err != nil {
+		return fmt.Errorf("tunnel: encode stream metadata: %w", err)
+	}
+	if len(data) > maxMetadataSize {
+		return fmt.Errorf("tunnel: stream metadata exceeds %d bytes", maxMetadataSize)
+	}
+	header := make([]byte, metadataHeaderSize)
+	binary.BigEndian.PutUint32(header, uint32(len(data)))
+	if _, err := w.Write(header); err != nil {
+		return fmt.Errorf("tunnel: write metadata length: %w", err)
+	}
+	if _, err := w.Write(data); err != nil {
+		return fmt.Errorf("tunnel: write metadata: %w", err)
+	}
+	return nil
+}
+
+func readMeta(r io.Reader) (StreamMeta, error) {
+	header := make([]byte, metadataHeaderSize)
+	if _, err := io.ReadFull(r, header); err != nil {
+		return StreamMeta{}, fmt.Errorf("tunnel: read metadata length: %w", err)
+	}
+	size := binary.BigEndian.Uint32(header)
+	if size == 0 || size > maxMetadataSize {
+		return StreamMeta{}, fmt.Errorf("tunnel: invalid metadata size %d", size)
+	}
+	data := make([]byte, size)
+	if _, err := io.ReadFull(r, data); err != nil {
+		return StreamMeta{}, fmt.Errorf("tunnel: read metadata: %w", err)
+	}
+	var meta StreamMeta
+	if err := json.Unmarshal(data, &meta); err != nil {
+		return StreamMeta{}, fmt.Errorf("tunnel: decode stream metadata: %w", err)
+	}
+	if meta.Kind == "" {
+		return StreamMeta{}, errors.New("tunnel: stream metadata kind is required")
+	}
+	return meta, nil
+}

internal/tunnel/yamux_test.go

@@ -0,0 +1,84 @@
+package tunnel
+
+import (
+	"context"
+	"net"
+	"testing"
+)
+
+func TestSessionOpenAcceptAndBidirectionalData(t *testing.T) {
+	left, right := net.Pipe()
+	defer left.Close()
+	defer right.Close()
+
+	serverCh := make(chan *Session, 1)
+	serverErrCh := make(chan error, 1)
+	go func() {
+		session, err := NewServer(right)
+		if err != nil {
+			serverErrCh <- err
+			return
+		}
+		serverCh <- session
+	}()
+
+	client, err := NewClient(left)
+	if err != nil {
+		t.Fatalf("create client session: %v", err)
+	}
+	defer client.Close()
+
+	var server *Session
+	select {
+	case err := <-serverErrCh:
+		t.Fatalf("create server session: %v", err)
+	case server = <-serverCh:
+	}
+	defer server.Close()
+
+	meta := StreamMeta{
+		Kind:    "http",
+		Method:  "POST",
+		Path:    "/upload",
+		Headers: map[string][]string{"Content-Type": {"application/octet-stream"}},
+	}
+	clientStream, err := client.Open(context.Background(), meta)
+	if err != nil {
+		t.Fatalf("open stream: %v", err)
+	}
+	defer clientStream.Close()
+
+	serverStream, err := server.Accept(context.Background())
+	if err != nil {
+		t.Fatalf("accept stream: %v", err)
+	}
+	defer serverStream.Close()
+
+	if serverStream.Meta.Kind != meta.Kind || serverStream.Meta.Path != meta.Path {
+		t.Fatalf("metadata mismatch: got %#v, want %#v", serverStream.Meta, meta)
+	}
+
+	const request = "request-body"
+	if _, err := clientStream.Write([]byte(request)); err != nil {
+		t.Fatalf("write request: %v", err)
+	}
+	buf := make([]byte, len(request))
+	if _, err := serverStream.Read(buf); err != nil {
+		t.Fatalf("read request: %v", err)
+	}
+	if string(buf) != request {
+		t.Fatalf("request mismatch: got %q, want %q", buf, request)
+	}
+
+	const response = "response-body"
+	if _, err := serverStream.Write([]byte(response)); err != nil {
+		t.Fatalf("write response: %v", err)
+	}
+	buf = make([]byte, len(response))
+	if _, err := clientStream.Read(buf); err != nil {
+		t.Fatalf("read response: %v", err)
+	}
+	if string(buf) != response {
+		t.Fatalf("response mismatch: got %q, want %q", buf, response)
+	}
+}

package-lock.json

@@ -9,8 +9,8 @@
       "version": "1.0.0",
       "license": "ISC",
       "devDependencies": {
-        "@tailwindcss/cli": "^4.1.17",
+        "@tailwindcss/cli": "^4.3.3",
-        "tailwindcss": "^4.1.17"
+        "tailwindcss": "^4.3.3"
       }
     },
     "node_modules/@jridgewell/gen-mapping": {
@@ -46,9 +46,9 @@
       }
     },
     "node_modules/@jridgewell/sourcemap-codec": {
-      "version": "1.5.5",
+      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.6.0.tgz",
-      "integrity": "sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==",
+      "integrity": "sha512-T7jf+5zgsZHwNJ4lvQ7/aezbyk0nNX+zJVWpmHA7VYsEx7a7qr5Rg5IbtJFqkgze5Y2sruq1RUY8Q837Od7iFw==",
       "dev": true,
       "license": "MIT"
     },
@@ -373,68 +373,68 @@
       }
     },
     "node_modules/@tailwindcss/cli": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/cli/-/cli-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/cli/-/cli-4.3.3.tgz",
-      "integrity": "sha512-jUIxcyUNlCC2aNPnyPEWU/L2/ik3pB4fF3auKGXr8AvN3T3OFESVctFKOBoPZQaZJIeUpPn1uCLp0MRxuek8gg==",
+      "integrity": "sha512-ZvS/n1ZHOBKcVlhkt8l5NNr1EDXk1NboYO5CYDOs6NUmvT9z6bzkwsosaJftY57T/3gWNzWMJzIXLodZC8ssdw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@parcel/watcher": "^2.5.1",
+        "@parcel/watcher": "2.5.1",
-        "@tailwindcss/node": "4.1.17",
+        "@tailwindcss/node": "4.3.3",
-        "@tailwindcss/oxide": "4.1.17",
+        "@tailwindcss/oxide": "4.3.3",
-        "enhanced-resolve": "^5.18.3",
+        "enhanced-resolve": "^5.24.1",
         "mri": "^1.2.0",
         "picocolors": "^1.1.1",
-        "tailwindcss": "4.1.17"
+        "tailwindcss": "4.3.3"
       },
       "bin": {
         "tailwindcss": "dist/index.mjs"
       }
     },
     "node_modules/@tailwindcss/node": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/node/-/node-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/node/-/node-4.3.3.tgz",
-      "integrity": "sha512-csIkHIgLb3JisEFQ0vxr2Y57GUNYh447C8xzwj89U/8fdW8LhProdxvnVH6U8M2Y73QKiTIH+LWbK3V2BBZsAg==",
+      "integrity": "sha512-/T8IKEsf9VTU6tLjgC7+sv2mOPtQxzE2jMw7u4Tt40Tx+QSZxpzh95/H6cMKoja9XuW7iMdLJYBB0o9G1CaAgg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@jridgewell/remapping": "^2.3.4",
+        "@jridgewell/remapping": "^2.3.5",
-        "enhanced-resolve": "^5.18.3",
+        "enhanced-resolve": "^5.24.1",
-        "jiti": "^2.6.1",
+        "jiti": "^2.7.0",
-        "lightningcss": "1.30.2",
+        "lightningcss": "1.32.0",
         "magic-string": "^0.30.21",
         "source-map-js": "^1.2.1",
-        "tailwindcss": "4.1.17"
+        "tailwindcss": "4.3.3"
       }
     },
     "node_modules/@tailwindcss/oxide": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide/-/oxide-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide/-/oxide-4.3.3.tgz",
-      "integrity": "sha512-F0F7d01fmkQhsTjXezGBLdrl1KresJTcI3DB8EkScCldyKp3Msz4hub4uyYaVnk88BAS1g5DQjjF6F5qczheLA==",
+      "integrity": "sha512-krXjAikiaFSPaK/FkAQT5UTx3VormQaiZ5hBFlJZ9UFQGB/rwg1MZIhHAG9smMQRTdyJxP6Qt5MwMtdyU5FWrA==",
       "dev": true,
       "license": "MIT",
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       },
       "optionalDependencies": {
-        "@tailwindcss/oxide-android-arm64": "4.1.17",
+        "@tailwindcss/oxide-android-arm64": "4.3.3",
-        "@tailwindcss/oxide-darwin-arm64": "4.1.17",
+        "@tailwindcss/oxide-darwin-arm64": "4.3.3",
-        "@tailwindcss/oxide-darwin-x64": "4.1.17",
+        "@tailwindcss/oxide-darwin-x64": "4.3.3",
-        "@tailwindcss/oxide-freebsd-x64": "4.1.17",
+        "@tailwindcss/oxide-freebsd-x64": "4.3.3",
-        "@tailwindcss/oxide-linux-arm-gnueabihf": "4.1.17",
+        "@tailwindcss/oxide-linux-arm-gnueabihf": "4.3.3",
-        "@tailwindcss/oxide-linux-arm64-gnu": "4.1.17",
+        "@tailwindcss/oxide-linux-arm64-gnu": "4.3.3",
-        "@tailwindcss/oxide-linux-arm64-musl": "4.1.17",
+        "@tailwindcss/oxide-linux-arm64-musl": "4.3.3",
-        "@tailwindcss/oxide-linux-x64-gnu": "4.1.17",
+        "@tailwindcss/oxide-linux-x64-gnu": "4.3.3",
-        "@tailwindcss/oxide-linux-x64-musl": "4.1.17",
+        "@tailwindcss/oxide-linux-x64-musl": "4.3.3",
-        "@tailwindcss/oxide-wasm32-wasi": "4.1.17",
+        "@tailwindcss/oxide-wasm32-wasi": "4.3.3",
-        "@tailwindcss/oxide-win32-arm64-msvc": "4.1.17",
+        "@tailwindcss/oxide-win32-arm64-msvc": "4.3.3",
-        "@tailwindcss/oxide-win32-x64-msvc": "4.1.17"
+        "@tailwindcss/oxide-win32-x64-msvc": "4.3.3"
       }
     },
     "node_modules/@tailwindcss/oxide-android-arm64": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-android-arm64/-/oxide-android-arm64-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-android-arm64/-/oxide-android-arm64-4.3.3.tgz",
-      "integrity": "sha512-BMqpkJHgOZ5z78qqiGE6ZIRExyaHyuxjgrJ6eBO5+hfrfGkuya0lYfw8fRHG77gdTjWkNWEEm+qeG2cDMxArLQ==",
+      "integrity": "sha512-Y85A2gmPSkl5Ve5qR86GL4HT509cFqQh1aes9p3sSkyTPwt0Pppf3GkwGe4JPACcRYjgJIEhQgM6dBClnr0NYw==",
       "cpu": [
         "arm64"
       ],
@@ -445,13 +445,13 @@
         "android"
       ],
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       }
     },
     "node_modules/@tailwindcss/oxide-darwin-arm64": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-darwin-arm64/-/oxide-darwin-arm64-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-darwin-arm64/-/oxide-darwin-arm64-4.3.3.tgz",
-      "integrity": "sha512-EquyumkQweUBNk1zGEU/wfZo2qkp/nQKRZM8bUYO0J+Lums5+wl2CcG1f9BgAjn/u9pJzdYddHWBiFXJTcxmOg==",
+      "integrity": "sha512-BiaWatpBcERQFDlOjRDpIVXuFK5PJez5SA4JMg6VYZdBYU+qKfV/vqjcIs+IYmtitf1xYQZTwXvU/8y4lfZUGw==",
       "cpu": [
         "arm64"
       ],
@@ -462,13 +462,13 @@
         "darwin"
       ],
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       }
     },
     "node_modules/@tailwindcss/oxide-darwin-x64": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-darwin-x64/-/oxide-darwin-x64-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-darwin-x64/-/oxide-darwin-x64-4.3.3.tgz",
-      "integrity": "sha512-gdhEPLzke2Pog8s12oADwYu0IAw04Y2tlmgVzIN0+046ytcgx8uZmCzEg4VcQh+AHKiS7xaL8kGo/QTiNEGRog==",
+      "integrity": "sha512-fAeUqfV5ndhxRwai8cXGzdLvul9utWOmeTkv69unv4ZXixjn61Z+p9lCWdwOwA3TYboG3BwdVuN/RDjhBRl0mw==",
       "cpu": [
         "x64"
       ],
@@ -479,13 +479,13 @@
         "darwin"
       ],
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       }
     },
     "node_modules/@tailwindcss/oxide-freebsd-x64": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-freebsd-x64/-/oxide-freebsd-x64-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-freebsd-x64/-/oxide-freebsd-x64-4.3.3.tgz",
-      "integrity": "sha512-hxGS81KskMxML9DXsaXT1H0DyA+ZBIbyG/sSAjWNe2EDl7TkPOBI42GBV3u38itzGUOmFfCzk1iAjDXds8Oh0g==",
+      "integrity": "sha512-iyf5bV6+wnAlflVeEy7R25dupxTNECZN5QMI0qNT6eT+EgaGdZcKhGkr5SdoaWiLJ3spLqIY9VCeSGrwmtg4kw==",
       "cpu": [
         "x64"
       ],
@@ -496,13 +496,13 @@
         "freebsd"
       ],
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       }
     },
     "node_modules/@tailwindcss/oxide-linux-arm-gnueabihf": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm-gnueabihf/-/oxide-linux-arm-gnueabihf-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm-gnueabihf/-/oxide-linux-arm-gnueabihf-4.3.3.tgz",
-      "integrity": "sha512-k7jWk5E3ldAdw0cNglhjSgv501u7yrMf8oeZ0cElhxU6Y2o7f8yqelOp3fhf7evjIS6ujTI3U8pKUXV2I4iXHQ==",
+      "integrity": "sha512-aAYUprJAJQWWbRrPvtjdroZ56Md+JM8pMiopS6xGEwDfLhqj+2ver2p4nU4Mb3CRqcMmNBjo8KkUgcxhkzVQGQ==",
       "cpu": [
         "arm"
       ],
@@ -513,81 +513,93 @@
         "linux"
       ],
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       }
     },
     "node_modules/@tailwindcss/oxide-linux-arm64-gnu": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm64-gnu/-/oxide-linux-arm64-gnu-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm64-gnu/-/oxide-linux-arm64-gnu-4.3.3.tgz",
-      "integrity": "sha512-HVDOm/mxK6+TbARwdW17WrgDYEGzmoYayrCgmLEw7FxTPLcp/glBisuyWkFz/jb7ZfiAXAXUACfyItn+nTgsdQ==",
+      "integrity": "sha512-nDxldcEENOxZRzC2uu9jrutZdAAQtb+8WWDCSnWL1zvBk1+FN+x6MtDViPB5AJMfttVCUhehGWus3XBPgatM/w==",
       "cpu": [
         "arm64"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
       ],
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       }
     },
     "node_modules/@tailwindcss/oxide-linux-arm64-musl": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm64-musl/-/oxide-linux-arm64-musl-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm64-musl/-/oxide-linux-arm64-musl-4.3.3.tgz",
-      "integrity": "sha512-HvZLfGr42i5anKtIeQzxdkw/wPqIbpeZqe7vd3V9vI3RQxe3xU1fLjss0TjyhxWcBaipk7NYwSrwTwK1hJARMg==",
+      "integrity": "sha512-Md44bD6veX/PC5iyF8cDVnw4HBIANZepRZZ7a8DQOvkfo5WUBwcp6iAuCUz23u+4SUkhJlD3eL7hNdW8ezd/kA==",
       "cpu": [
         "arm64"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
       ],
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       }
     },
     "node_modules/@tailwindcss/oxide-linux-x64-gnu": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-x64-gnu/-/oxide-linux-x64-gnu-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-x64-gnu/-/oxide-linux-x64-gnu-4.3.3.tgz",
-      "integrity": "sha512-M3XZuORCGB7VPOEDH+nzpJ21XPvK5PyjlkSFkFziNHGLc5d6g3di2McAAblmaSUNl8IOmzYwLx9NsE7bplNkwQ==",
+      "integrity": "sha512-tx7us1muwOKAKWao2v/GaafFeQboE6aj88vC6ziN2NCGcRm8gWUhwjzg+YdVB1e4boAtdtma4L43onunI6NS4w==",
       "cpu": [
         "x64"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
       ],
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       }
     },
     "node_modules/@tailwindcss/oxide-linux-x64-musl": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-x64-musl/-/oxide-linux-x64-musl-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-x64-musl/-/oxide-linux-x64-musl-4.3.3.tgz",
-      "integrity": "sha512-k7f+pf9eXLEey4pBlw+8dgfJHY4PZ5qOUFDyNf7SI6lHjQ9Zt7+NcscjpwdCEbYi6FI5c2KDTDWyf2iHcCSyyQ==",
+      "integrity": "sha512-SJxX60smvHgasZoBy11dX6YRjXJFovwWBoedhbQPOBzgFWBHGB+TVPWB9BxzR7TTxU8FQZAI2AyiNCMzFm8Img==",
       "cpu": [
         "x64"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
       ],
       "engines": {
-        "node": ">= 10"
+        "node": ">= 20"
       }
     },
     "node_modules/@tailwindcss/oxide-wasm32-wasi": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-wasm32-wasi/-/oxide-wasm32-wasi-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-wasm32-wasi/-/oxide-wasm32-wasi-4.3.3.tgz",
-      "integrity": "sha512-cEytGqSSoy7zK4JRWiTCx43FsKP/zGr0CsuMawhH67ONlH+T79VteQeJQRO/X7L0juEUA8ZyuYikcRBf0vsxhg==",
+      "integrity": "sha512-jx1+rPhY/5Ympkktd656HBWEBLxP7dH06losBLjjf5vgCODXvi9KhtftWcMIwTFIDqBr7cRnQkdLnAG+IOlGvQ==",
       "bundleDependencies": [
         "@napi-rs/wasm-runtime",
         "@emnapi/core",
@@ -603,21 +615,21 @@
       "license": "MIT",
       "optional": true,
       "dependencies": {
-        "@emnapi/core": "^1.6.0",
+        "@emnapi/core": "^1.11.1",
-        "@emnapi/runtime": "^1.6.0",
+        "@emnapi/runtime": "^1.11.1",
-        "@emnapi/wasi-threads": "^1.1.0",
+        "@emnapi/wasi-threads": "^1.2.2",
-        "@napi-rs/wasm-runtime": "^1.0.7",
+        "@napi-rs/wasm-runtime": "^1.1.4",
-        "@tybys/wasm-util": "^0.10.1",
+        "@tybys/wasm-util": "^0.10.2",
-        "tslib": "^2.4.0"
+        "tslib": "^2.8.1"
       },
       "engines": {
         "node": ">=14.0.0"
       }
     },
     "node_modules/@tailwindcss/oxide-win32-arm64-msvc": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-win32-arm64-msvc/-/oxide-win32-arm64-msvc-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-win32-arm64-msvc/-/oxide-win32-arm64-msvc-4.3.3.tgz",
-      "integrity": "sha512-JU5AHr7gKbZlOGvMdb4722/0aYbU+tN6lv1kONx0JK2cGsh7g148zVWLM0IKR3NeKLv+L90chBVYcJ8uJWbC9A==",
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@@ -628,13 +640,13 @@
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-        "node": ">= 10"
+        "node": ">= 20"
       }
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-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-win32-x64-msvc/-/oxide-win32-x64-msvc-4.1.17.tgz",
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@@ -645,7 +657,7 @@
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-        "node": ">= 10"
+        "node": ">= 20"
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@@ -675,14 +687,14 @@
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         "graceful-fs": "^4.2.4",
-        "tapable": "^2.2.0"
+        "tapable": "^2.3.3"
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@@ -742,9 +754,9 @@
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-      "version": "2.6.1",
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-      "resolved": "https://registry.npmjs.org/jiti/-/jiti-2.6.1.tgz",
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@@ -752,9 +764,9 @@
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@@ -768,23 +780,23 @@
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+        "lightningcss-linux-x64-gnu": "1.32.0",
-        "lightningcss-linux-x64-musl": "1.30.2",
+        "lightningcss-linux-x64-musl": "1.32.0",
-        "lightningcss-win32-arm64-msvc": "1.30.2",
+        "lightningcss-win32-arm64-msvc": "1.32.0",
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-      "version": "1.30.2",
+      "version": "1.32.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-android-arm64/-/lightningcss-android-arm64-1.30.2.tgz",
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@@ -803,9 +815,9 @@
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+      "resolved": "https://registry.npmjs.org/lightningcss-darwin-arm64/-/lightningcss-darwin-arm64-1.32.0.tgz",
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@@ -824,9 +836,9 @@
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@@ -845,9 +857,9 @@
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@@ -866,9 +878,9 @@
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     "node_modules/lightningcss-linux-arm-gnueabihf": {
-      "version": "1.30.2",
+      "version": "1.32.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-linux-arm-gnueabihf/-/lightningcss-linux-arm-gnueabihf-1.30.2.tgz",
+      "resolved": "https://registry.npmjs.org/lightningcss-linux-arm-gnueabihf/-/lightningcss-linux-arm-gnueabihf-1.32.0.tgz",
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@@ -887,13 +899,16 @@
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     "node_modules/lightningcss-linux-arm64-gnu": {
-      "version": "1.30.2",
+      "version": "1.32.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-linux-arm64-gnu/-/lightningcss-linux-arm64-gnu-1.30.2.tgz",
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       "cpu": [
         "arm64"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -908,13 +923,16 @@
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     "node_modules/lightningcss-linux-arm64-musl": {
-      "version": "1.30.2",
+      "version": "1.32.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-linux-arm64-musl/-/lightningcss-linux-arm64-musl-1.30.2.tgz",
+      "resolved": "https://registry.npmjs.org/lightningcss-linux-arm64-musl/-/lightningcss-linux-arm64-musl-1.32.0.tgz",
-      "integrity": "sha512-5Vh9dGeblpTxWHpOx8iauV02popZDsCYMPIgiuw97OJ5uaDsL86cnqSFs5LZkG3ghHoX5isLgWzMs+eD1YzrnA==",
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       "cpu": [
         "arm64"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -929,13 +947,16 @@
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     },
     "node_modules/lightningcss-linux-x64-gnu": {
-      "version": "1.30.2",
+      "version": "1.32.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-linux-x64-gnu/-/lightningcss-linux-x64-gnu-1.30.2.tgz",
+      "resolved": "https://registry.npmjs.org/lightningcss-linux-x64-gnu/-/lightningcss-linux-x64-gnu-1.32.0.tgz",
-      "integrity": "sha512-Cfd46gdmj1vQ+lR6VRTTadNHu6ALuw2pKR9lYq4FnhvgBc4zWY1EtZcAc6EffShbb1MFrIPfLDXD6Xprbnni4w==",
+      "integrity": "sha512-V7Qr52IhZmdKPVr+Vtw8o+WLsQJYCTd8loIfpDaMRWGUZfBOYEJeyJIkqGIDMZPwPx24pUMfwSxxI8phr/MbOA==",
       "cpu": [
         "x64"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -950,13 +971,16 @@
       }
     },
     "node_modules/lightningcss-linux-x64-musl": {
-      "version": "1.30.2",
+      "version": "1.32.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-linux-x64-musl/-/lightningcss-linux-x64-musl-1.30.2.tgz",
+      "resolved": "https://registry.npmjs.org/lightningcss-linux-x64-musl/-/lightningcss-linux-x64-musl-1.32.0.tgz",
-      "integrity": "sha512-XJaLUUFXb6/QG2lGIW6aIk6jKdtjtcffUT0NKvIqhSBY3hh9Ch+1LCeH80dR9q9LBjG3ewbDjnumefsLsP6aiA==",
+      "integrity": "sha512-bYcLp+Vb0awsiXg/80uCRezCYHNg1/l3mt0gzHnWV9XP1W5sKa5/TCdGWaR/zBM2PeF/HbsQv/j2URNOiVuxWg==",
       "cpu": [
         "x64"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -971,9 +995,9 @@
       }
     },
     "node_modules/lightningcss-win32-arm64-msvc": {
-      "version": "1.30.2",
+      "version": "1.32.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-win32-arm64-msvc/-/lightningcss-win32-arm64-msvc-1.30.2.tgz",
+      "resolved": "https://registry.npmjs.org/lightningcss-win32-arm64-msvc/-/lightningcss-win32-arm64-msvc-1.32.0.tgz",
-      "integrity": "sha512-FZn+vaj7zLv//D/192WFFVA0RgHawIcHqLX9xuWiQt7P0PtdFEVaxgF9rjM/IRYHQXNnk61/H/gb2Ei+kUQ4xQ==",
+      "integrity": "sha512-8SbC8BR40pS6baCM8sbtYDSwEVQd4JlFTOlaD3gWGHfThTcABnNDBda6eTZeqbofalIJhFx0qKzgHJmcPTnGdw==",
       "cpu": [
         "arm64"
       ],
@@ -992,9 +1016,9 @@
       }
     },
     "node_modules/lightningcss-win32-x64-msvc": {
-      "version": "1.30.2",
+      "version": "1.32.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-win32-x64-msvc/-/lightningcss-win32-x64-msvc-1.30.2.tgz",
+      "resolved": "https://registry.npmjs.org/lightningcss-win32-x64-msvc/-/lightningcss-win32-x64-msvc-1.32.0.tgz",
-      "integrity": "sha512-5g1yc73p+iAkid5phb4oVFMB45417DkRevRbt/El/gKXJk4jid+vPFF/AXbxn05Aky8PapwzZrdJShv5C0avjw==",
+      "integrity": "sha512-Amq9B/SoZYdDi1kFrojnoqPLxYhQ4Wo5XiL8EVJrVsB8ARoC1PWW6VGtT0WKCemjy8aC+louJnjS7U18x3b06Q==",
       "cpu": [
         "x64"
       ],
@@ -1094,16 +1118,16 @@
       }
     },
     "node_modules/tailwindcss": {
-      "version": "4.1.17",
+      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.1.17.tgz",
+      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.3.3.tgz",
-      "integrity": "sha512-j9Ee2YjuQqYT9bbRTfTZht9W/ytp5H+jJpZKiYdP/bpnXARAuELt9ofP0lPnmHjbga7SNQIxdTAXCmtKVYjN+Q==",
+      "integrity": "sha512-gOhV3P7ufE62QDGg1zVaTgCR+EtPv92k2nIhVcVKcLmxT1sUBsQGhnZj175j+MqRt4zLF7ic+sCYjfhxMxj7YQ==",
       "dev": true,
       "license": "MIT"
     },
     "node_modules/tapable": {
-      "version": "2.3.0",
+      "version": "2.3.3",
-      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.3.tgz",
-      "integrity": "sha512-g9ljZiwki/LfxmQADO3dEY1CbpmXT5Hm2fJ+QaGKwSXUylMybePR7/67YW7jOrrvjEgL1Fmz5kzyAjWVWLlucg==",
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       "dev": true,
       "license": "MIT",
       "engines": {

package.json

@@ -19,7 +19,7 @@
     "build:errors-css": "tailwindcss -c ./tools/tailwind/tailwind.config.cjs -i ./tools/tailwind/input.css -o ./internal/errorpages/assets/errors.css --minify"
   },
   "devDependencies": {
-    "@tailwindcss/cli": "^4.1.17",
+    "@tailwindcss/cli": "^4.3.3",
-    "tailwindcss": "^4.1.17"
+    "tailwindcss": "^4.3.3"
   }
 }

progress.md

@@ -1,353 +0,0 @@
-# HopGate Progress / 진행 현황
-
-이 문서는 HopGate 아키텍처 대비 현재 구현 상태와 이후 추가해야 할 작업을 정리한 Milestone 문서입니다. (ko)  
-This document tracks implementation progress against the HopGate architecture and lists remaining milestones. (en)
-
----
-
-## 1. High-level Status / 상위 수준 상태
-
-- 아키텍처 문서 및 README 정리 완료 (ko/en 병기).
-  Architecture and README are documented in both Korean and English.
-- 서버/클라이언트 엔트리 포인트, DTLS 핸드셰이크, 기본 PostgreSQL/ent 스키마까지 1차 뼈대 구현 완료.
-  First skeleton implementation is done for server/client entrypoints, DTLS handshake, and basic PostgreSQL/ent schema.
-- 기본 Proxy 동작(HTTP ↔ DTLS 터널링), Admin API 비즈니스 로직, ACME 기반 인증서 관리는 구현 완료된 상태.
-  Core proxying (HTTP ↔ DTLS tunneling), admin API business logic, and ACME-based certificate management are implemented.
-- 스트림 ARQ, Observability, Hardening, ACME 고급 전략 등은 아직 남아 있는 다음 단계 작업이다.
-  Stream-level ARQ, observability, hardening, and advanced ACME operational strategies remain as next-step work items.
-
----
-
-## 2. Completed Work / 완료된 작업
-
-### 2.1 Documentation / 문서
-
-- 아키텍처 개요: [`ARCHITECTURE.md`](ARCHITECTURE.md)  
-  - ko/en 병기, 전체 구조/디렉터리/흐름/다음 단계 정리. (ko)  
-  - Bilingual, documents overall structure, directories, flows, and next steps. (en)
-
-- 프로젝트 개요: [`README.md`](README.md)  
-  - 사용법, DTLS 핸드셰이크 테스트 방법, Admin Plane 요약, 주의사항. (ko/en)  
-  - Usage, DTLS handshake test guide, admin plane summary, caveats. (en)
-
-- 커밋 규칙: [`COMMIT_MESSAGE.md`](COMMIT_MESSAGE.md)  
-  - `[type] short description [BREAK]` 형식, 타입 우선순위 정의, BREAK 규칙. (ko/en)  
-  - Defines commit message format, type priorities, and `[BREAK]` convention. (en)
-
-- 아키텍처 그림용 프롬프트: [`architecture.prompt`](images/architecture.prompt)  
-  - 외부 도구(예: 나노바나나 Pro)가 참조할 상세 다이어그램 지침. (en 설명 위주)  
-
----
-
-### 2.2 Server / Client Entrypoints
-
-- 서버 메인: [`cmd/server/main.go`](cmd/server/main.go)
-  - 서버 설정 로드 (`LoadServerConfigFromEnv`).
-  - PostgreSQL 연결 및 ent 스키마 init (`store.OpenPostgresFromEnv`).
-  - Debug 모드 시 self-signed localhost cert 생성 (`dtls.NewSelfSignedLocalhostConfig`).
-  - DTLS 서버 생성 (`dtls.NewPionServer`) 및 Accept + Handshake 루프 (`PerformServerHandshake`).
-  - ent 기반 `DomainValidator` + `domainGateValidator` 를 사용해 `(domain, client_api_key)` 조합과 DNS/IP(옵션) 검증을 수행.
-
-- 클라이언트 메인: [`cmd/client/main.go`](cmd/client/main.go)  
-  - CLI + env 병합 설정 (우선순위: CLI > env).  
-    - `server_addr`, `domain`, `api_key`, `local_target`, `debug`.  
-  - DTLS 클라이언트 생성 (`dtls.NewPionClient`)  
-    - `Debug=true` 시 `InsecureSkipVerify=true` TLS 설정 사용.  
-  - DTLS 핸드셰이크 수행 (`dtls.PerformClientHandshake`)  
-    - 성공 시 도메인/로컬 타깃 로그 출력.  
-
----
-
-### 2.3 Config / Env Handling
-
-- 공통 설정: [`internal/config/config.go`](internal/config/config.go)  
-  - `ServerConfig`  
-    - `HTTPListen`, `HTTPSListen`, `DTLSListen`, `Domain`, `ProxyDomains`, `Debug`, `Logging`.  
-    - env: `HOP_SERVER_HTTP_LISTEN`, `HOP_SERVER_HTTPS_LISTEN`, `HOP_SERVER_DTLS_LISTEN`, `HOP_SERVER_DOMAIN`, `HOP_SERVER_PROXY_DOMAINS`, `HOP_SERVER_DEBUG`.  
-  - `ClientConfig`  
-    - `ServerAddr`, `Domain`, `ClientAPIKey`, `LocalTarget`, `Debug`, `Logging`.  
-    - env: `HOP_CLIENT_SERVER_ADDR`, `HOP_CLIENT_DOMAIN`, `HOP_CLIENT_API_KEY`, `HOP_CLIENT_LOCAL_TARGET`, `HOP_CLIENT_DEBUG`.  
-  - `.env` 로더 (`loadDotEnvOnce`) + 각종 helper (`getEnvBool`, CSV 파싱 등).  
-
-- DB 설정: [`internal/store/postgres.go`](internal/store/postgres.go)  
-  - `ConfigFromEnv()` 로 DB 설정 로딩:  
-    - `HOP_DB_DSN`, `HOP_DB_MAX_OPEN_CONNS`, `HOP_DB_MAX_IDLE_CONNS`, `HOP_DB_CONN_MAX_LIFETIME`.  
-
-- `.env` 샘플: [`.env.example`](.env.example)  
-  - Logging/Loki, 서버 포트, 클라이언트 설정, DB 설정 예시 포함.  
-
----
-
-### 2.4 DTLS Layer / Handshake
-
-- 인터페이스: [`internal/dtls/dtls.go`](internal/dtls/dtls.go)
-  - `Session`, `Server`, `Client`.
-
-- pion/dtls 전송 구현: [`internal/dtls/transport_pion.go`](internal/dtls/transport_pion.go)
-  - `NewPionServer(PionServerConfig)`
-    - UDP 리스너 + DTLS 서버 (`piondtls.Listen`).
-  - `NewPionClient(PionClientConfig)`
-    - Timeout/TLSConfig 설정, `piondtls.Dial` 사용.
-
-- 핸드셰이크 로직: [`internal/dtls/handshake.go`](internal/dtls/handshake.go)
-  - 메시지: `handshakeRequest{domain, client_api_key}`, `handshakeResponse{ok, message, domain}`.
-  - `DomainValidator` 인터페이스.
-  - `PerformServerHandshake` / `PerformClientHandshake` 구현 완료.
-
-- self-signed TLS: [`internal/dtls/selfsigned.go`](internal/dtls/selfsigned.go)
-  - localhost CN, SAN(DNS/IP) 포함 self-signed cert 생성.
-
-- Domain Validator:
-  - 인터페이스 정의: [`internal/dtls/handshake.go`](internal/dtls/handshake.go)
-    - `ValidateDomainAPIKey(ctx, domain, clientAPIKey string) error`.
-  - 실제 구현: [`internal/admin/domain_validator.go`](internal/admin/domain_validator.go)
-    - ent.Client + PostgreSQL 기반으로 `Domain` 테이블 조회.
-    - 도메인 문자열은 `"host"` 또는 `"host:port"` 모두 허용하되, DB 조회 시에는 host 부분만 사용.
-    - `(domain, client_api_key)` 조합이 정확히 일치하는지 검증.
-  - DTLS 핸드셰이크 DNS/IP 게이트: [`cmd/server/main.go`](cmd/server/main.go:37)
-    - `canonicalizeDomainForDNS` + `domainGateValidator` 를 사용해, 클라이언트가 제시한 도메인의 A/AAAA 레코드가 `HOP_ACME_EXPECT_IPS` 에 설정된 IPv4/IPv6 IP 중 하나 이상과 일치하는지 검사한 뒤 DB 기반 `DomainValidator` 에 위임.
-    - `HOP_ACME_EXPECT_IPS` 가 비어 있는 경우에는 DNS/IP 검증을 생략하고 DB 검증만 수행.
-  - 기존 Dummy 구현: [`internal/dtls/validator_dummy.go`](internal/dtls/validator_dummy.go) 는 이제 개발/테스트용 참고 구현으로만 유지.
-
----
-
-### 2.5 Admin Plane Skeleton / 관리 Plane 스켈레톤
-
-- DomainService 인터페이스: [`internal/admin/service.go`](internal/admin/service.go)  
-  - `RegisterDomain(ctx, domain, memo) (clientAPIKey string, err error)`  
-  - `UnregisterDomain(ctx, domain, clientAPIKey string) error`  
-
-- HTTP Handler: [`internal/admin/http.go`](internal/admin/http.go)
-  - `Authorization: Bearer {ADMIN_API_KEY}` 검증.
-  - 엔드포인트:
-    - `POST /api/v1/admin/domains/register`
-    - `POST /api/v1/admin/domains/unregister`
-  - JSON request/response 구조 정의 및 기본 에러 처리.
-  - 실제 서비스(`DomainService`) 및 라우터 wiring, ent 기반 구현이 완료되어 도메인 등록/해제가 동작.
-
----
-
-### 2.6 DB / ent
-
-- ent 스키마: [`ent/schema/domain.go`](ent/schema/domain.go)  
-  - `Domain` entity:  
-    - `id` (UUID, PK)  
-    - `domain` (unique)  
-    - `client_api_key` (unique, max 64)  
-    - `memo`, `created_at`, `updated_at`.  
-
-- ent 코드 생성 완료: [`tools/gen_ent.sh`](tools/gen_ent.sh), [`ent/*`](ent/)  
-  - PostgreSQL dialect 사용.  
-  - `client.Schema.Create(ctx)` 로 테이블 자동 생성(DB init).  
-
-- PostgreSQL 연결 헬퍼: [`internal/store/postgres.go`](internal/store/postgres.go)  
-  - `OpenPostgres(ctx, logger, cfg)`  
-    - `ent/dialect/sql.Open("postgres", DSN)`  
-    - pool 설정, ping, ent.Driver wrapping, `Schema.Create`.  
-  - `OpenPostgresFromEnv(ctx, logger)`  
-    - 서버에서 바로 호출 가능.  
-
----
-
-### 2.7 Logging / Build / Docker
-
-- 구조적 로깅: [`internal/logging/logging.go`](internal/logging/logging.go)
-  - JSON 단일라인 로그, `level`, `ts`, `msg`, `Fields`.
-  - Loki/Promtail + Grafana 스택에 최적화.
-
-- 빌드/도커:
-  - [`Makefile`](Makefile) — `make server`, `make client`, `make docker-server`.
-    - `server` 타겟은 Tailwind 기반 에러 페이지 CSS 빌드를 위한 `errors-css` 타겟을 선행 실행 (`npm run build:errors-css`).
-  - [`Dockerfile.server`](Dockerfile.server) — multi-stage build, Alpine runtime.
-    - Build stage 에 Node.js + npm 을 설치하고, `npm install && npm run build:errors-css` 를 통해 에러 페이지용 CSS를 빌드한 뒤 Go 서버 바이너리를 생성.
-  - [`.dockerignore`](.dockerignore) — `images/` 제외.
-
-- 아키텍처 이미지: [`images/architecture.jpeg`](images/architecture.jpeg)
-
----
-
-### 2.8 Error Pages / 에러 페이지
-
-- 에러 페이지 템플릿: [`internal/errorpages/templates/*.html`](internal/errorpages/templates/400.html)
-  - HTTP 상태 코드별 HTML:
-    - `400.html`, `404.html`, `500.html`, `525.html`.
-  - TailwindCSS 기반 레이아웃 및 스타일 적용 (영문/한글 메시지 병기).
-  - `go:embed` 로 서버 바이너리에 포함되어 기본값으로 사용.
-
-- 에러 페이지 정적 에셋: [`internal/errorpages/assets`](internal/errorpages/errorpages.go)
-  - TailwindCSS 빌드 결과: `errors.css` (내장 CSS).
-  - 로고 등 브랜드 리소스: `logo.svg` 등 (내장 가능).
-  - 런타임에서는 `/__hopgate_assets__/...` prefix 로 HopGate 서버가 직접 서빙:
-    - 1순위: `HOP_ERROR_ASSETS_DIR` 가 설정된 경우 해당 디렉터리에서 정적 파일 로드.
-    - 2순위: 설정되지 않은 경우 `internal/errorpages/assets` 에 embed 된 에셋 사용.
-
-- 에러 페이지 렌더링 로직: [`internal/errorpages/errorpages.go`](internal/errorpages/errorpages.go), [`cmd/server/main.go`](cmd/server/main.go)
-  - `writeErrorPage(w, r, status)` → `errorpages.Render` 호출.
-  - HTML 로딩 우선순위:
-    - 1) `HOP_ERROR_PAGES_DIR/<status>.html` (env 미설정 시 `./errors/<status>.html`)
-    - 2) `internal/errorpages/templates/<status>.html` (go:embed 기본 템플릿)
-  - 주요 사용처:
-    - 잘못된 ACME HTTP-01 요청 (400/404).
-    - 허용되지 않은 Host 요청 (404).
-    - DTLS 세션 부재/포워딩 실패 → 525 TLS/DTLS Handshake Failed 페이지.
-
----
-
-## 3. Remaining Work / 남은 작업
-
-### 3.1 Admin Plane Implementation / 관리 Plane 구현
-
-- [x] DomainService 실제 구현 추가: [`internal/admin/service.go`](internal/admin/service.go)
-  - ent.Client + PostgreSQL 기반 `RegisterDomain` / `UnregisterDomain` 구현.  
-  - domain + client_api_key 유효성 검증 로직 포함.  
-
-- [x] Admin API와 서버 라우터 연결: [`cmd/server/main.go`](cmd/server/main.go)
-  - `http.ServeMux` 혹은 router에 `admin.Handler.RegisterRoutes` 연결.  
-  - Admin API용 HTTP/HTTPS 엔드포인트 구성.  
-
-- [x] Admin API 키 관리
-  - env 혹은 설정에 `ADMIN_API_KEY` 추가 및 로딩.  
-  - Admin Handler에 주입.  
-
----
-
-### 3.2 DomainValidator Implementation / DomainValidator 구현
-
-- [x] `DomainValidator` 의 실제 구현 추가 (예: `internal/admin/domain_validator.go`).
-  - ent.Client 를 사용해 `Domain` 테이블 조회.
-  - `(domain, client_api_key)` 조합 검증.
-  - DummyDomainValidator 를 실제 구현으로 교체.
-
-- [x] DTLS Handshake 와 Admin Plane 통합
-  - Admin Plane 에서 관리하는 Domain 테이블을 사용해, 핸드셰이크 시 `(domain, client_api_key)` 조합을 DB 기준으로 검증.
-  - 도메인 문자열은 `"host"` 또는 `"host:port"` 형태 모두 허용하되, DB 조회용 canonical 도메인에서는 host 부분만 사용.
-
----
-
-### 3.3 Proxy Core / gRPC Tunneling
-
-HopGate 의 최종 목표는 **TCP + TLS(HTTPS) + HTTP/2 + gRPC** 기반 터널로 HTTP 트래픽을 전달하는 것입니다.
-이 섹션에서는 DTLS 기반 초기 설계를 정리만 남기고, 실제 구현/남은 작업은 gRPC 터널 기준으로 재정의합니다.
-
-- [x] 서버 측 gRPC 터널 엔드포인트 설계/구현
-  - 외부 사용자용 HTTPS(443/TCP)와 같은 포트에서:
-    - 일반 HTTP 요청(브라우저/REST)은 기존 리버스 프록시 경로로,
-    - `Content-Type: application/grpc` 인 요청은 클라이언트 터널용 gRPC 서버로
-    라우팅하는 구조를 설계합니다.
-  - 예시: `rpc OpenTunnel(stream TunnelFrame) returns (stream TunnelFrame)` (bi-directional streaming).
-  - HTTP/2 + ALPN(h2)을 사용해 gRPC 스트림을 유지하고, 요청/응답 HTTP 메시지를 `TunnelFrame`으로 멀티플렉싱합니다.
-
-- [x] 클라이언트 측 gRPC 터널 설계/구현
-  - 클라이언트 프로세스는 HopGate 서버로 장기 유지 bi-di gRPC 스트림을 **하나(또는 소수 개)** 연 상태로 유지합니다.
-  - 서버로부터 들어오는 `TunnelFrame`(요청 메타데이터 + 바디 chunk)을 수신해,
-    로컬 HTTP 서비스(예: `127.0.0.1:8080`)로 proxy 하고, 응답을 다시 `TunnelFrame` 시퀀스로 전송합니다.
-  - 기존 `internal/proxy/client.go` 의 HTTP 매핑/스트림 ARQ 경험을, gRPC 메시지 단위 chunk/flow-control 설계에 참고합니다.
-
-- [x] HTTP ↔ gRPC 터널 매핑 규약 정의
-  - 한 HTTP 요청/응답 쌍을 gRPC 스트림 상에서 어떻게 표현할지 스키마를 정의합니다:
-    - 요청: `StreamID`, method, URL, headers, body chunks
-    - 응답: `StreamID`, status, headers, body chunks, error
-  - 현재 `internal/protocol/protocol.go`의 논리 모델(Envelope/StreamOpen/StreamData/StreamClose/StreamAck)을
-    gRPC 메시지(oneof 필드 등)로 직렬화할지, 또는 새로운 gRPC 전용 메시지를 정의할지 결정합니다.
-  - Back-pressure / flow-control 은 gRPC/HTTP2의 스트림 flow-control 을 최대한 활용하고,
-    추가 application-level windowing 이 필요하면 최소한으로만 도입합니다.
-
-- [ ] gRPC 터널 기반 E2E 플로우 정의/테스트 계획
-  - 하나의 gRPC 스트림 위에서:
-    - 동시에 여러 정적 리소스(`/css`, `/js`, `/img`) 요청,
-    - 큰 응답(수 MB 파일)과 작은 응답(API JSON)이 섞여 있는 시나리오,
-    - 클라이언트 재시작/네트워크 단절 후 재연결 시나리오
-    를 포함하는 테스트 플랜을 작성합니다.
-  - 기대 동작:
-    - 느린 요청이 있더라도 다른 요청이 **같은 TCP 연결/스트림 집합 내에서** 과도하게 지연되지 않을 것.
-    - 서버/클라이언트 로그에 프로토콜 위반 경고(`unexpected frame ...`)가 발생하지 않을 것.
-
-> Note: 기존 DTLS 기반 스트림/ARQ/멀티플렉싱(3.3A/3.3B)의 작업 내역은
-> 구현 경험/아이디어 참고용으로만 유지하며, 신규 기능/운영 계획은 gRPC 터널을 기준으로 진행합니다.
-
----
-
-### 3.4 ACME Integration / ACME 연동
-
-- [x] [`internal/acme/acme.go`](internal/acme/acme.go) 실제 구현
-  - lego 기반 ACME 매니저 구현.
-  - 메인 도메인 + 프록시 도메인용 인증서 발급/갱신.
-  - HTTP-01 챌린지 처리(webroot 방식).
-
-- [x] 서버 main 에 ACME 기반 `*tls.Config` 주입
-  - DTLS / HTTPS 리스너에 ACME 인증서 적용 (Debug 모드에서는 DTLS 에 self-signed, HTTPS 에 ACME 사용).
-
-- [ ] ACME 고급 기능 및 운영 전략 보완
-  - TLS-ALPN-01 챌린지 지원 여부 검토 및 필요 시 lego 설정/핸들러 추가.
-  - 인증서 발급/갱신 실패 시 재시도/백오프 및 경고 로그/알림을 포함한 에러 처리 전략 정의.
-  - Debug(스테이징 CA) / Production(실 CA) 환경 전환 플로우와 도메인/환경별 ACME 설정 매트릭스를 문서화.
-
----
-
-### 3.5 Observability / 관측성
-
-- [x] Prometheus 메트릭 노출 및 서버 wiring
-  - `cmd/server/main.go` 에 Prometheus `/metrics` 엔드포인트 추가 (예: promhttp.Handler).
-  - DTLS 핸드셰이크 성공/실패 수, HTTP 요청 수, HTTP 요청 지연, Proxy 에러 수에 대한 메트릭을 정의합니다.
-  - 메트릭 라벨은 메서드/상태 코드/결과/에러 타입 등에 한정되며, 도메인/클라이언트 ID/request_id 는 구조적 로그 필드로만 노출됩니다.
-
-- [ ] Loki/Grafana 대시보드 및 쿼리 예시
-  - Loki/Promtail 구성을 가정한 주요 로그 쿼리 예시 정리(도메인, 클라이언트 ID, request_id 기준).
-  - Prometheus 메트릭 기반 기본 대시보드 템플릿 작성 (DTLS 상태, 프록시 트래픽, 에러율 등).
-
----
-
-### 3.6 Hardening / 안정성 & 구성
-
-- [x] 설정 유효성 검사 추가
-  - 필수 env 누락/오류에 대한 명확한 에러 메시지.
-
-- [ ] 에러 처리/재시도 정책
-  - DTLS 재연결, Proxy 재시도, DB 재시도 정책 정의.
-
-- [ ] 보안 검토
-  - Admin API 인증 방식 재검토 (예: IP allowlist, 추가 인증 수단).
-  - 클라이언트 API Key 저장/회전 전략.
-
-- [ ] Proxy 서버 추상화 및 Router 리팩터링
-  - `internal/proxy/server.go` 의 `ServerProxy` 및 `Router` 인터페이스를 실제 HTTP ↔ DTLS 터널링 경로에 적용.
-  - 현재 `cmd/server/main.go` 에 위치한 Proxy 코어 로직을 proxy 레이어로 이동.
-
----
-
-## 4. Milestones / 마일스톤
-
-### Milestone 1 — DTLS Handshake + Admin + DB (기본 인증 토대)
-
-- [x] DTLS transport & handshake skeleton 구현 (server/client).
-- [x] Domain ent schema + PostgreSQL 연결 & schema init.
-- [x] DomainService 실제 구현 + DomainValidator 구현.
-- [x] Admin API + ent + PostgreSQL 연결 (실제 도메인 등록/해제 동작).
-
-### Milestone 2 — Full HTTP Tunneling (프락시 동작 완성)
-
-- [x] 서버 Proxy 코어 구현 및 HTTPS ↔ DTLS 라우팅.
-  - 현재 `cmd/server/main.go` 의 `newHTTPHandler` / `dtlsSessionWrapper.ForwardHTTP` 경로에서 동작합니다.
-- [x] 클라이언트 Proxy 루프 구현 및 로컬 서비스 연동.
-  - `cmd/client/main.go` + [`ClientProxy.StartLoop()`](internal/proxy/client.go:59) 를 통해 DTLS 세션 위에서 로컬 서비스와 연동됩니다.
-- [ ] End-to-end HTTP 요청/응답 터널링 E2E 테스트.
-
-### Milestone 3 — ACME + TLS/DTLS 정식 인증
-
-- [x] ACME 매니저 구현 (lego 기반).
-- [x] HTTPS/DTLS 리스너에 ACME 인증서 주입.
-- [ ] ACME 고급 기능 및 운영 전략 정리 (예: TLS-ALPN-01, 인증서 롤오버/장애 대응 전략).
-
-### Milestone 4 — Observability & Hardening
-
-- [ ] Prometheus/Loki/Grafana 통합.
-  - Prometheus 메트릭 정의 및 `/metrics` 엔드포인트는 이미 구현 및 동작 중이며,
-    Loki/Promtail/Grafana 대시보드 및 운영 통합 작업은 아직 남아 있습니다.
-
-- [ ] 에러/리트라이/타임아웃 정책 정교화.  
-- [ ] 보안/구성 최종 점검 및 문서화.  
-
----
-
-이 `progress.md` 파일은 아키텍처/코드 변경에 따라 수시로 업데이트하며, Milestone 기준으로 완료 여부를 체크해 나가면 된다.  
-This `progress.md` file should be updated as the architecture and code evolve, using the milestones above as a checklist.

protocol.md

@@ -1,197 +0,0 @@
-# HopGate gRPC Tunnel Protocol
-
-이 문서는 HopGate 서버–클라이언트 사이의 gRPC 기반 HTTP 터널링 규약을 정리합니다. (ko)
-This document describes the gRPC-based HTTP tunneling protocol between HopGate server and clients. (en)
-
-## 1. Transport Overview / 전송 개요
-
-- Transport: TCP + TLS(HTTPS) + HTTP/2 + gRPC
-- Single long-lived bi-directional gRPC stream per client: `OpenTunnel`
-- Application payload type: `Envelope` (from `internal/protocol/hopgate_stream.proto`)
-- HTTP requests/responses are multiplexed as logical streams identified by `StreamID`.
-
-gRPC service (conceptual):
-```proto
-service HopGateTunnel {
-  rpc OpenTunnel (stream Envelope) returns (stream Envelope);
-}
-```
-
-## 2. Message Types / 메시지 타입
-
-Defined in `internal/protocol/hopgate_stream.proto`:
-
-- `HeaderValues`
-  - Wraps repeated header values: `map<string, HeaderValues>`
-- `Request` / `Response`
-  - Simple single-message HTTP representation (not used in the streaming tunnel path initially).
-- `StreamOpen`
-  - Opens a new logical stream for HTTP request/response (or other protocols in the future).
-- `StreamData`
-  - Carries body chunks for a stream (`id`, `seq`, `data`).
-- `StreamClose`
-  - Marks the end of a stream (`id`, `error`).
-- `StreamAck`
-  - Legacy ARQ/flow-control hint for UDP/DTLS; in gRPC tunnel it is reserved/optional.
-- `Envelope`
-  - Top-level container with `oneof payload` of the above types.
-
-In the gRPC tunnel, `Envelope` is the only gRPC message type used on the `OpenTunnel` stream.
-
-## 3. Logical Streams and StreamID / 논리 스트림과 StreamID
-
-- A single `OpenTunnel` gRPC stream multiplexes many **logical streams**.
-- Each logical stream corresponds to one HTTP request/response pair.
-- Logical streams are identified by `StreamOpen.id` (text StreamID).
-- The server generates unique IDs per gRPC connection:
-  - HTTP streams: `"http-{n}"` where `n` is a monotonically increasing counter.
-  - Control stream: `"control-0"` (special handshake/metadata stream).
-
-Within a gRPC connection:
-- Multiple `StreamID`s may be active concurrently.
-- Frames with different StreamIDs may be arbitrarily interleaved.
-- Order within a stream is tracked by `StreamData.seq` (starting at 0).
-
-## 4. HTTP Request Mapping (Server → Client) / HTTP 요청 매핑
-
-When the public HTTPS reverse-proxy (`cmd/server/main.go`) receives an HTTP request for a domain that is bound
-to a client tunnel, it serializes the request into a logical stream as follows.
-
-### 4.1 StreamOpen (request metadata and headers)
-
-- `StreamOpen.id`
-  - New unique StreamID: `"http-{n}"`.
-- `StreamOpen.service_name`
-  - Logical service selection on the client (e.g., `"web"`).
-- `StreamOpen.target_addr`
-  - Optional explicit local target address on the client (e.g., `"127.0.0.1:8080"`).
-- `StreamOpen.header`
-  - Contains HTTP request headers and pseudo-headers:
-  - Pseudo-headers:
-    - `X-HopGate-Method`: HTTP method (e.g., `"GET"`, `"POST"`).
-    - `X-HopGate-URL`: original URL path + query (e.g., `"/api/v1/foo?bar=1"`).
-    - `X-HopGate-Host`: Host header value.
-  - Other keys:
-    - All remaining HTTP headers from the incoming request, copied as-is into the map.
-
-### 4.2 StreamData* (request body chunks)
-
-- If the request has a body, the server chunks it into fixed-size pieces.
-- Chunk size: `protocol.StreamChunkSize` (currently 4 KiB).
-- For each chunk:
-  - `StreamData.id = StreamOpen.id`
-  - `StreamData.seq` increments from 0, 1, 2, …
-  - `StreamData.data` contains the raw bytes.
-
-### 4.3 StreamClose (end of request body)
-
-- After sending all body chunks, the server sends a `StreamClose`:
-  - `StreamClose.id = StreamOpen.id`
-  - `StreamClose.error` is empty on success.
-  - If there was an application-level error while reading the body, `error` contains a short description.
-
-The client reconstructs the HTTP request by:
-- Reassembling the URL and headers from the `StreamOpen` pseudo-headers and header map.
-- Concatenating `StreamData.data` in `seq` order into the request body.
-- Treating `StreamClose` as the end-of-stream marker.
-
-## 5. HTTP Response Mapping (Client → Server) / HTTP 응답 매핑
-
-The client receives `StreamOpen` + `StreamData*` + `StreamClose`, performs a local HTTP request to its
-configured target (e.g., `http://127.0.0.1:8080`), then returns an HTTP response using the same StreamID.
-
-### 5.1 StreamOpen (response headers and status)
-
-- `StreamOpen.id`
-  - Same as the request StreamID.
-- `StreamOpen.header`
-  - Contains response headers and a pseudo-header for status:
-  - Pseudo-header:
-    - `X-HopGate-Status`: HTTP status code as a string (e.g., `"200"`, `"502"`).
-  - Other keys:
-    - All HTTP response headers from the local backend, copied as-is.
-
-### 5.2 StreamData* (response body chunks)
-
-- The client reads the local HTTP response body and chunks it into 4 KiB pieces (same `StreamChunkSize`).
-- For each chunk:
-  - `StreamData.id = StreamOpen.id`
-  - `StreamData.seq` increments from 0.
-  - `StreamData.data` contains the raw bytes.
-
-### 5.3 StreamClose (end of response body)
-
-- When the local backend response is fully read, the client sends a `StreamClose`:
-  - `StreamClose.id` is the same StreamID.
-  - `StreamClose.error`:
-    - Empty string on success.
-    - Short error description if the local HTTP request/response failed (e.g., connect timeout).
-
-The server reconstructs the HTTP response by:
-- Parsing `X-HopGate-Status` into an integer HTTP status code.
-- Copying other headers into the outgoing response writer (with some security headers overridden by the server).
-- Concatenating `StreamData.data` in `seq` order into the HTTP response body.
-- Considering `StreamClose.error` for logging/metrics and possibly mapping to error pages if needed.
-
-## 6. Control / Handshake Stream / 컨트롤 스트림
-
-Before any HTTP request streams are opened, the client sends a single **control stream** to authenticate
-and describe itself.
-
-- `StreamOpen` (control):
-  - `id = "control-0"`
-  - `service_name = "control"`
-  - `header` contains:
-    - `X-HopGate-Domain`: domain this client is responsible for.
-    - `X-HopGate-API-Key`: client API key for the domain.
-    - `X-HopGate-Local-Target`: default local target such as `127.0.0.1:8080`.
-- No `StreamData` is required for the control stream in the initial design.
-- The server can optionally reply with its own control `StreamOpen/Close` to signal acceptance/rejection.
-
-On the server side:
-- `grpcTunnelServer.OpenTunnel` should:
-  1. Wait for the first `Envelope` with `StreamOpen.id == "control-0"`.
-  2. Extract domain, api key, and local target from the headers.
-  3. Call the ent-based `DomainValidator` to validate `(domain, api_key)`.
-  4. If validation succeeds, register this gRPC stream as the active tunnel for that domain.
-  5. If validation fails, log and close the gRPC stream.
-
-Once the control stream handshake completes successfully, the server may start multiplexing multiple
-HTTP request streams (`http-0`, `http-1`, …) over the same `OpenTunnel` connection.
-
-## 7. Multiplexing Semantics / 멀티플렉싱 의미
-
-- A single TCP + TLS + HTTP/2 + gRPC connection carries:
-  - One long-lived `OpenTunnel` gRPC bi-di stream.
-  - Within it, many logical streams identified by `StreamID`.
-- The server can open multiple HTTP streams concurrently for a given client:
-  - Example: `http-0` for `/css/app.css`, `http-1` for `/api/users`, `http-2` for `/img/logo.png`.
-  - Frames for these IDs can interleave arbitrarily on the wire.
-- Per-stream ordering is preserved by combining `seq` ordering and the reliability of TCP/gRPC.
-- Slow or large responses on one stream should not prevent other streams from making progress,
-  because gRPC/HTTP2 handles stream-level flow control and scheduling.
-
-## 8. Flow Control and StreamAck / 플로우 컨트롤 및 StreamAck
-
-- The gRPC tunnel runs over TCP/HTTP2, which already provides:
-  - Reliable, in-order delivery.
-  - Connection-level and stream-level flow control.
-- Therefore, application-level selective retransmission is **not required** for the gRPC tunnel.
-- `StreamAck` remains defined in the proto for backward compatibility with the DTLS design and
-  as a potential future hint channel (e.g., window size hints), but is not used in the initial gRPC tunnel.
-
-## 9. Security Considerations / 보안 고려사항
-
-- TLS:
-  - In production, the server uses ACME-issued certificates, and clients validate the server certificate
-    using system Root CAs and SNI (`ServerName`).
-  - In debug mode, clients may use `InsecureSkipVerify: true` to allow local/self-signed certs.
-- Authentication:
-  - Application-level authentication relies on `(domain, api_key)` pairs sent via the control stream headers.
-  - The server must validate these pairs against the `Domain` table using `DomainValidator`.
-- Authorization and isolation:
-  - Each gRPC tunnel is bound to a single domain (or a defined set of domains) after successful control handshake.
-  - HTTP requests for other domains must not be forwarded over this tunnel.
-
-이 규약을 기준으로 서버/클라이언트 구현을 정렬하면, 하나의 gRPC `OpenTunnel` 스트림 위에서
-여러 HTTP 요청을 안정적으로 멀티플렉싱하면서도, 도메인/API 키 기반 인증과 TLS 보안을 함께 유지할 수 있습니다.