System.Net.WebConnection.CreateTunnel C# (CSharp) Method

		bool CreateTunnel (HttpWebRequest request, Stream stream, out byte [] buffer)
		{
			StringBuilder sb = new StringBuilder ();
			sb.Append ("CONNECT ");
			sb.Append (request.Address.Host);
			sb.Append (':');
			sb.Append (request.Address.Port);
			sb.Append (" HTTP/");
			if (request.ServicePoint.ProtocolVersion == HttpVersion.Version11)
				sb.Append ("1.1");
			else
				sb.Append ("1.0");

			sb.Append ("\r\nHost: ");
			sb.Append (request.Address.Authority);
			string challenge = Data.Challenge;
			Data.Challenge = null;
			bool have_auth = (request.Headers ["Proxy-Authorization"] != null);
			if (have_auth) {
				sb.Append ("\r\nProxy-Authorization: ");
				sb.Append (request.Headers ["Proxy-Authorization"]);
			} else if (challenge != null && Data.StatusCode == 407) {
				have_auth = true;
				ICredentials creds = request.Proxy.Credentials;
				Authorization auth = AuthenticationManager.Authenticate (challenge, request, creds);
				if (auth != null) {
					sb.Append ("\r\nProxy-Authorization: ");
					sb.Append (auth.Message);
				}
			}
			sb.Append ("\r\n\r\n");

			Data.StatusCode = 0;
			byte [] connectBytes = Encoding.Default.GetBytes (sb.ToString ());
			stream.Write (connectBytes, 0, connectBytes.Length);

			int status;
			WebHeaderCollection result = ReadHeaders (request, stream, out buffer, out status);
			if (!have_auth && result != null && status == 407) { // Needs proxy auth
				Data.StatusCode = status;
				Data.Challenge = result ["Proxy-Authenticate"];
				return false;
			} else if (status != 200) {
				string msg = String.Format ("The remote server returned a {0} status code.", status);
				HandleError (WebExceptionStatus.SecureChannelFailure, null, msg);
				return false;
			}

			return (result != null);
		}