Http CONNECT request return empty respone

I want to read Https page using TcpClient. I use below code

var client = new TcpClient(url, 443);//"127.0.0.1", 8888);// Fiddler portclient.SendTimeout = 30000;Stream responseStream = client.GetStream();// send CONNECT request to serverbyte[] 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);

that send CONNECT request to host (google.com)

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

respone must be somthing like this

HTTP/1.1 200 Connection EstablishedStartTime: 22:42:38.774Connection: close

but responseStream return nothing. when I use Fiddler as a proxy

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

it works fine and return 200 response. There is something wrong that Fiddler fixed it?

I use windows 8.1 and test with .Net 2 and 4.5.1.