如何连接HTTPS代理

本文关键字：HTTPS 代理 连接 何连接 | 更新日期: 2023-09-27 18:04:42

我试图通过使用套接字的代理连接到HTTPS服务器。据我所知，当使用HTTP代理时，应该将套接字连接到它，然后与它交互，因为它是真正的服务器。对于HTTP，这种方法可以工作，但是对于HTTPS则不行。为什么?

这是一个连接到HTTPS服务器的简单程序 
using System;
using System.Text;
using System.Net.Sockets;
using System.Net.Security;
namespace SslTcpClient
{
    public class SslTcpClient
    {
        public static void Main(string[] args)
        {
            string host = "encrypted.google.com";
            string proxy = "127.0.0.1";//host;
            int proxyPort = 8888;//443;
            // Connect socket
            TcpClient client = new TcpClient(proxy, proxyPort);
            // Wrap in SSL stream
            SslStream sslStream = new SslStream(client.GetStream());
            sslStream.AuthenticateAsClient(host);
            // Send request
            byte[] request = Encoding.UTF8.GetBytes(String.Format("GET https://{0}/  HTTP/1.1'r'nHost: {0}'r'n'r'n", host));
            sslStream.Write(request);
            sslStream.Flush();
            // Read response
            byte[] buffer = new byte[2048];
            int bytes;
            do
            {
                bytes = sslStream.Read(buffer, 0, buffer.Length);
                Console.Write(Encoding.UTF8.GetString(buffer, 0, bytes));
            } while (bytes != 0);
            client.Close();
            Console.ReadKey();
        }
    }
}

当proxy = host和proxyPort = 443连接成功。但是当我将它们设置为127.0.0.1:8888(本地主机上的fiddler代理)时，它不起作用。程序挂在sslStream.AuthenticateAsClient(host);为什么?Fiddler支持HTTPS(浏览器可以通过它连接)。

注:不，我不能在我的情况下使用HttpWebRequest

如何连接HTTPS代理

我自己解决了。下面是解决方案:

using System;
using System.Text;
using System.Net.Sockets;
using System.Net.Security;
namespace SslTcpClient
{
    public class SslTcpClient
    {
        public static void Main(string[] args)
        {
            string host = "encrypted.google.com";
            string proxy = "127.0.0.1";//host;
            int proxyPort = 8888;//443;
            byte[] buffer = new byte[2048];
            int bytes;
            // Connect socket
            TcpClient client = new TcpClient(proxy, proxyPort);
            NetworkStream stream = client.GetStream();
            // Establish Tcp tunnel
            byte[] tunnelRequest = Encoding.UTF8.GetBytes(String.Format("CONNECT {0}:443  HTTP/1.1'r'nHost: {0}'r'n'r'n", host));
            stream.Write(tunnelRequest , 0, tunnelRequest.Length);
            stream.Flush();
            // Read response to CONNECT request
            // There should be loop that reads multiple packets
            bytes = stream.Read(buffer, 0, buffer.Length);
            Console.Write(Encoding.UTF8.GetString(buffer, 0, bytes));
            // Wrap in SSL stream
            SslStream sslStream = new SslStream(stream);
            sslStream.AuthenticateAsClient(host);
            // Send request
            byte[] request = Encoding.UTF8.GetBytes(String.Format("GET https://{0}/  HTTP/1.1'r'nHost: {0}'r'n'r'n", host));
            sslStream.Write(request, 0, request.Length);
            sslStream.Flush();
            // Read response
            do
            {
                bytes = sslStream.Read(buffer, 0, buffer.Length);
                Console.Write(Encoding.UTF8.GetString(buffer, 0, bytes));
            } while (bytes != 0);
            client.Close();
            Console.ReadKey();
        }
    }
}
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