Node.JS 编写的简易 HTTP 代理服务器，用于检查流量是否通过了代理

http-proxy-server.js

const http = require("http");
const net = require("net");
const url = require("url");

const proxyPort = 8888; // 你的代理端口

const server = http.createServer((req, res) => {
    // 处理普通 HTTP 请求
    res.writeHead(200, { "Content-Type": "text/plain" });
    res.end("Proxy acts as a tunnel for HTTPS/TCP");
});

// 处理 HTTPS/TCP 的 CONNECT 方法
server.on("connect", (req, clientSocket, head) => {
    const { port, hostname } = url.parse(`//${req.url}`, false, true);

    console.log(`[Proxy Log] 收到连接请求: ${hostname}:${port}`);

    const serverSocket = net.connect(port || 80, hostname, () => {
        clientSocket.write(
            "HTTP/1.1 200 Connection Established\r\n" +
                "Proxy-agent: Node.js-Proxy\r\n" +
                "\r\n"
        );
        serverSocket.write(head);
        serverSocket.pipe(clientSocket);
        clientSocket.pipe(serverSocket);
    });

    serverSocket.on("error", (err) => {
        console.error(`[Proxy Log] 目标连接错误 (${hostname}):`, err.message);
        clientSocket.end();
    });

    clientSocket.on("error", (err) => {
        console.error(`[Proxy Log] 客户端连接错误:`, err.message);
        serverSocket.end();
    });
});

server.listen(proxyPort, () => {
    console.log(`验证代理服务器已启动，端口: ${proxyPort}`);
});