Http CONNECT 请求返回空响应

Question

我想使用

TcpClient

阅读 https 页面。我使用下面的代码

var client = new TcpClient(url, 443);//"127.0.0.1", 8888);// Fiddler port
client.SendTimeout = 30000;
Stream responseStream = client.GetStream();

// send CONNECT request to server
byte[] tunnelRequest = Encoding.ASCII.GetBytes("CONNECT www.google.com:443 HTTP/1.1\r\nUser-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:44.0) Gecko/20100101 Firefox/35.0\r\nProxy-Connection: keep-alive\r\nConnection: keep-alive\r\nHost: www.google.com:443\r\n\r\n");
responseStream.Write(tunnelRequest, 0, tunnelRequest.Length);
responseStream.Flush();

// read CONNECT response 
string connectResponse = ReadResponse(responseStream);
Console.WriteLine("server connect response :  " + connectResponse);

发送

CONNECT

请求到托管 (google.com)

CONNECT www.google.com:443 HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:44.0) Gecko/20100101 Firefox/44.0
Proxy-Connection: keep-alive
Connection: keep-alive
Host: www.google.com:443

回复一定是这样的

HTTP/1.1 200 Connection Established
StartTime: 22:42:38.774
Connection: close

但是

responseStream

什么也不返回。当我使用 Fiddler 作为代理时

var client = new TcpClient("127.0.0.1", 8888);

它工作正常并返回

200

响应。 Fiddler 修复了它吗？

我使用 Windows 8.1 并使用 .Net 2 和 4.5.1 进行测试。

Answer 1

基于rfc代理存在时使用的CONNECT方法。

由于 TLS 特别需要端到端连接来提供 身份验证并防止中间人攻击，本备忘录 指定 CONNECT 方法来建立跨代理的隧道。

直接沟通的情况：

var client = new TcpClient("127.0.0.1", 8888);//url, 443);//
client.SendTimeout = 30000;
Stream responseStream = client.GetStream();

// Wrap in SSL stream
SslStream sslStream = new SslStream(responseStream);
sslStream.AuthenticateAsClient(url);

byte[] byts = Encoding.ASCII.GetBytes("GET / HTTP/1.1\r\nHost: www.google.com\r\nConnection: keep-alive\r\n\r\n");
sslStream.Write(byts, 0, byts.Length);

var str = ReadResponse(sslStream);