public bool Connect(Uri connectUri)
        {
            _path = connectUri.PathAndQuery;
            _version = Protocols.Http2;
            _scheme = connectUri.Scheme;
            _host = connectUri.Host;
            _port = connectUri.Port;
            ServerUri = connectUri.Authority;

            if (_sessionAdapter != null)
            {
                return false;
            }

            try
            {
                int port = connectUri.Port;

                int securePort;

                if (!int.TryParse(ConfigurationManager.AppSettings["securePort"], out securePort))
                {
                    Http2Logger.LogError("Incorrect port in the config file!");
                    return false;
                }


                //Connect alpn extension, set known protocols
                var extensions = new[] {ExtensionType.Renegotiation, ExtensionType.ALPN};

                Options = port == securePort
                               ? new SecurityOptions(SecureProtocol.Tls1, extensions, new[] { Protocols.Http1, Protocols.Http2 },
                                                     ConnectionEnd.Client)
                               : new SecurityOptions(SecureProtocol.None, extensions, new[] { Protocols.Http1, Protocols.Http2 },
                                                     ConnectionEnd.Client);

                Options.VerificationType = CredentialVerification.None;
                Options.Certificate = Org.Mentalis.Security.Certificates.Certificate.CreateFromCerFile(CertificatePath);
                Options.Flags = SecurityFlags.Default;
                Options.AllowedAlgorithms = SslAlgorithms.RSA_AES_256_SHA | SslAlgorithms.NULL_COMPRESSION;

                var socket = new SecureSocket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp, Options);
                using (var monitor = new ALPNExtensionMonitor())
                {
                    monitor.OnProtocolSelected += (o, args) => { _selectedProtocol = args.SelectedProtocol; };
                    socket.Connect(new DnsEndPoint(connectUri.Host, connectUri.Port), monitor);

                    _clientStream = new DuplexStream(socket, true);

                    if (_useHandshake)
                    {
                        MakeHandshakeEnvironment();
                        //Handshake manager determines what handshake must be used: upgrade or secure

                        if (socket.SecureProtocol != SecureProtocol.None)
                        {
                            socket.MakeSecureHandshake(Options);
                            _selectedProtocol = socket.SelectedProtocol;
                        }

                        if (socket.SecureProtocol == SecureProtocol.None || _selectedProtocol == Protocols.Http1)
                        {
                            try
                            {
                                var handshakeResult = new UpgradeHandshaker(_environment).Handshake();
                                _environment.Add(HandshakeKeys.Result, handshakeResult);
                                _useHttp20 = handshakeResult[HandshakeKeys.Successful] as string == HandshakeKeys.True;

                                if (!_useHttp20)
                                {
                                    Dispose(false);
                                    return true;
                                }
                            }
                            catch (Http2HandshakeFailed ex)
                            {
                                if (ex.Reason == HandshakeFailureReason.InternalError)
                                {
                                    _useHttp20 = false;
                                }
                                else
                                {
                                    Http2Logger.LogError("Specified server did not respond");
                                    Dispose(true);
                                    return false;
                                }
                            }
                        }
                    }
                }

                Http2Logger.LogDebug("Handshake finished");

                if (_useHttp20)
                {
                    //TODO provide transport info
                    _sessionAdapter = new Http2ClientMessageHandler(_clientStream, ConnectionEnd.Client, default(TransportInformation),
                                                                     CancellationToken.None);
                }
            }
            catch (SocketException)
            {
                Http2Logger.LogError("Check if any server listens port " + connectUri.Port);
                Dispose(true);
                return false;
            }
            catch (Exception ex)
            {
                Http2Logger.LogError("Unknown connection exception was caught: " + ex.Message);
                Dispose(true);
                return false;
            }

            return true;
        }
        public bool Connect(Uri connectUri)
        {
            _path = connectUri.PathAndQuery;
            _version = Protocols.Http2;
            _scheme = connectUri.Scheme;
            _host = connectUri.Host;
            _port = connectUri.Port;
            ServerUri = connectUri.Authority;

            if (_sessionAdapter != null)
            {
                return false;
            }

            try
            {
                int port = connectUri.Port;

                int securePort;

                if (!int.TryParse(ConfigurationManager.AppSettings["securePort"], out securePort))
                {
                    Http2Logger.LogError("Incorrect port in the config file!");
                    return false;
                }
                _isSecure = port == securePort;

                var tcpClnt = new TcpClient(connectUri.Host, port);

                _clientStream = tcpClnt.GetStream();

                if (_useHandshake)
                {
                    if (_isSecure)
                    {
                        _clientStream = new SslStream(_clientStream, false);
                        _certificate = LoadPKCS12Certificate(AssemblyName + CertificatePath, String.Empty);

                        _chain = new X509Chain {_certificate};
                        var certList = new X509List { _certificate };
                        
                        (_clientStream as SslStream).AuthenticateAsClient(connectUri.AbsoluteUri, certList, _chain,
                                                                          SslProtocols.Tls, SslStrength.All, false);
                        
                        _selectedProtocol = (_clientStream as SslStream).AlpnSelectedProtocol;
                    }

                    if (!_isSecure || _selectedProtocol == Protocols.Http1)
                    {
                        MakeHandshakeEnvironment();
                        try
                        {
                            var handshakeResult = new UpgradeHandshaker(_environment).Handshake();
                            _environment.Add(HandshakeKeys.Result, handshakeResult);
                            _useHttp20 = handshakeResult[HandshakeKeys.Successful] as string == HandshakeKeys.True;

                            if (!_useHttp20)
                            {
                                Dispose(false);
                                return true;
                            }
                        }
                        catch (Http2HandshakeFailed ex)
                        {
                            if (ex.Reason == HandshakeFailureReason.InternalError)
                            {
                                _useHttp20 = false;
                            }
                            else
                            {
                                Http2Logger.LogError("Specified server did not respond");
                                Dispose(true);
                                return false;
                            }
                        }
                    }
                }

                Http2Logger.LogDebug("Handshake finished");

                Protocol = _isSecure ? SslProtocols.Tls : SslProtocols.None;

                if (_useHttp20)
                {
                    _sessionAdapter = new Http2ClientMessageHandler(_clientStream, ConnectionEnd.Client, _isSecure, CancellationToken.None);
                }
            }
            catch (SocketException)
            {
                Http2Logger.LogError("Check if any server listens port " + connectUri.Port);
                Dispose(true);
                return false;
            }
            catch (Exception ex)
            {
                Http2Logger.LogError("Unknown connection exception was caught: " + ex.Message);
                Dispose(true);
                return false;
            }

            return true;
        }