在代理服务器中建立 HTTPS 连接时出现问题。（CONNECT 方法）

Question

我正在开发一个基于java的代理服务器。对于简单的 http 请求，代理服务器正在工作。但是对于 HTTPS 连接，连接会超时。这是我执行的步骤。我首先从输入流中读取一行并创建一个连接服务器的套接字。之后我给了客户 200 Status。之后我在客户端套接字和服务器套接字之间异步读写。但目前这不起作用，连接超时，我无法调试问题。

public class ProxyServer extends Thread {
private String host;
private int port;
private ServerSocket serverSocket;
private InputStream proxyToClientIP;
private OutputStream proxyToClientOP;
private InputStream proxyToServerIP;
private OutputStream proxyToServerOP;
private Socket socket;
private Socket socketFromProxyServer;


ProxyServer(ServerSocket serverSocket, Socket socket) {
    this.serverSocket = serverSocket;
    this.socket = socket;
    this.start();
}

public void run() {
    processInputRequest();
}

public void processInputRequest() {
    try {
        proxyToClientIP = socket.getInputStream();
        proxyToClientOP = socket.getOutputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(proxyToClientIP));
        String hostDetails = reader.readLine();
        System.out.println(hostDetails);
        boolean isConnect = false;
        //Need to parse request and find req type as GET or CONNECT
        //As of now we assume it to be Connect request
        if (!isConnect) {
            processGetRequest();
        } else {
            processConnectRequest();
        }
    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

public void processConnectRequest() {
    //Need to get host name from request. Currently Hardcoded for developing purpose
    host = "harish-4072";
    port = 8383;
    try {
        socketFromProxyServer = new Socket(host, port);
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(proxyToClientOP));
        writer.write("HTTP/1.1 200 Connection established\r\n" + "\r\n");
        writer.flush();
        proxyToServerOP = socketFromProxyServer.getOutputStream();
        proxyToServerIP = socketFromProxyServer.getInputStream();
        proxyRequest();
    } catch (IOException ex) {
        System.out.println(ex);
    }
}




public void proxyRequest() {
    try {
        new Thread() {
            @Override
            public void run() {
                try {
                    byte[] read = new byte[1024];
                    int in;
                    System.out.println("Reading");
                    while ((in = proxyToClientIP.read(read)) != -1) {
                        proxyToServerOP.write(read, 0, in);
                        proxyToServerOP.flush();
                    }
                } catch (SocketException e) {
                    System.out.println(e);
                } catch (IOException ex) {

                }
            }
        }.start();
        byte[] reply = new byte[1024];
        int out;
        System.out.println("Writing");
        while ((out = proxyToServerIP.read(reply)) != -1) {
            proxyToClientOP.write(reply, 0, out);

            proxyToClientOP.flush();
        }
    } catch (IOException ex) {

    }

    public void processGetRequest() {
   //
   }
}

Answer 1

I first read one line from input stream and created a socket connecting Server. ... After that I asynchronously read and write between Client Socket and Server socket.

问题是您只读取一行，而您需要从客户端读取完整的 HTTP 请求 header，即直到请求结束的所有内容 header（ \r\n\r\n).

因为您没有这样做，HTTP 请求的未读部分被转发到服务器。但是服务器正在等待 TLS 握手的开始，这些数据使服务器感到困惑。这可能会导致挂起或中止，具体取决于数据的内容和服务器的种类。

在代理服务器中建立 HTTPS 连接时出现问题。（CONNECT 方法）

Problem in establishing connection in HTTPS in proxy server.(CONNECT Method)

java

ssl

https

proxy

tunnel