Araqne.Web.WebSocket.Connect C# (CSharp) Method

        private void Connect()
        {
            int port = uri.Port;
            if (port == -1)
                port = 80;

            client = new TcpClient(uri.Host, port);

            try
            {
                string webSocketKey = NewWebSocketKey();
                string handshake = NewHandshakeRequest(webSocketKey);

                Stream stream = client.GetStream();
                byte[] handshakeBytes = Encoding.UTF8.GetBytes(handshake);
                stream.Write(handshakeBytes, 0, handshakeBytes.Length);
                stream.Flush();

                byte[] b = new byte[8096];

                string response = "";
                while (true)
                {
                    int readBytes = stream.Read(b, 0, b.Length);
                    if (readBytes <= 0)
                        break;

                    response += Encoding.UTF8.GetString(b, 0, readBytes);
                    if (response.EndsWith("\r\n\r\n"))
                        break;
                }

                if (!response.StartsWith("HTTP/1.1 101 "))
                    throw new IOException("websocket is not supported");

                IDictionary headers = new Hashtable();
                string[] lines = Regex.Split(response, "\r\n");
                foreach (string line in lines)
                {
                    int p = line.IndexOf(':');
                    if (p < 0)
                        continue;

                    string key = line.Substring(0, p).Trim().ToLower();
                    string val = line.Substring(p + 1).Trim();
                    headers[key] = val;
                }

                string upgrade = GetHeader(headers, "upgrade");
                string connection = GetHeader(headers, "connection");
                string accept = GetHeader(headers, "sec-websocket-accept");

                if (upgrade != "websocket")
                    throw new IOException("Unexpected Upgrade value: " + upgrade);

                if (connection != "Upgrade")
                    throw new IOException("Unexpected Connection value: " + connection);

                SHA1 sha1 = new SHA1Managed();
                string input = webSocketKey + WEBSOCKET_KEY_TRAILER;
                byte[] hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(input));
                string expected = Convert.ToBase64String(hash);

                if (expected != accept)
                    throw new IOException("invalid websocket accept: key " + webSocketKey + ", expected " + expected + ", actual " + accept);

                ReadContext ctx = new ReadContext();
                ctx.expected = 2;
                client.GetStream().BeginRead(ctx.headerBuffer, 0, ctx.expected, new AsyncCallback(ReadCallback), ctx);
            }
            catch (Exception e)
            {
                if (OnError != null)
                {
                    try { OnError(e); }
                    catch (Exception) {}
                }

                Close(e);
                throw;
            }
        }