fix: Docker container auto-detect host proxy via host.docker.internal

Docker containers can't reach host proxies on 127.0.0.1 (container loopback).
Now probes both 127.0.0.1 and host.docker.internal so Docker users get
automatic proxy detection without any configuration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -36,6 +36,7 @@
 - `ClaudeCodeSetup.tsx` 文件名与导出名不一致，重命名为 `AnthropicSetup.tsx`
 - Dashboard 模型偏好从硬编码 `gpt-5.2-codex` 改为使用 `codex` 别名
 - 构建脚本 `vite build --root web` 兼容性问题，改用 `npm run build:web`
+- Docker 容器内代理自动检测失败：`detectLocalProxy()` 现在同时探测 `127.0.0.1`（裸机）和 `host.docker.internal`（Docker 容器→宿主机），零配置即生效
 
 ## [v0.8.0](https://github.com/icebear0828/codex-proxy/releases/tag/v0.8.0) - 2026-02-24
 

docker-compose.yml

@@ -1,6 +1,8 @@
 services:
   codex-proxy:
     build: .
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
     ports:
       - "${PORT:-8080}:8080"
     volumes:

src/tls/curl-binary.ts

@@ -187,12 +187,20 @@ const PROXY_PORTS = [
   { port: 10808, proto: "socks5" },// v2ray SOCKS5
 ];
 
+/**
+ * Hosts to probe for proxy detection.
+ * 127.0.0.1 — bare-metal / host machine.
+ * host.docker.internal — Docker container → host machine
+ * (DNS lookup fails on bare-metal → ENOTFOUND → handled by error callback, <5ms).
+ */
+const PROXY_HOSTS = ["127.0.0.1", "host.docker.internal"];
+
 let _proxyUrl: string | null | undefined; // undefined = not yet detected
 
-/** Probe a TCP port on localhost. Resolves true if a server is listening. */
-function probePort(port: number, timeoutMs = 500): Promise<boolean> {
+/** Probe a TCP port on the given host. Resolves true if a server is listening. */
+function probePort(host: string, port: number, timeoutMs = 500): Promise<boolean> {
   return new Promise((resolve) => {
-    const sock = createConnection({ host: "127.0.0.1", port }, () => {
+    const sock = createConnection({ host, port }, () => {
       sock.destroy();
       resolve(true);
     });
@@ -203,15 +211,17 @@ function probePort(port: number, timeoutMs = 500): Promise<boolean> {
 }
 
 /**
- * Detect a local proxy by probing common ports.
+ * Detect a local proxy by probing common ports on localhost and Docker host.
  * Called once at startup, result is cached.
  */
 async function detectLocalProxy(): Promise<string | null> {
-  for (const { port, proto } of PROXY_PORTS) {
-    if (await probePort(port)) {
-      const url = `${proto}://127.0.0.1:${port}`;
-      console.log(`[Proxy] Auto-detected local proxy: ${url}`);
-      return url;
+  for (const host of PROXY_HOSTS) {
+    for (const { port, proto } of PROXY_PORTS) {
+      if (await probePort(host, port)) {
+        const url = `${proto}://${host}:${port}`;
+        console.log(`[Proxy] Auto-detected local proxy: ${url}`);
+        return url;
+      }
     }
   }
   return null;