public async Task CreateConnectionAsync()

in src/Microsoft.Azure.Relay/HybridConnectionClient.cs [186:242]
49 lines of code
5 McCabe index (conditional complexity)

        public async Task<HybridConnectionStream> CreateConnectionAsync(IDictionary<string, string> requestHeaders)
        {
            TrackingContext trackingContext = CreateTrackingContext(this.Address);
            string traceSource = nameof(HybridConnectionClient) + "(" + trackingContext + ")";
            // todo - Check if timeout helper needs to be started here.
            var timeoutHelper = TimeoutHelper.CreateOnly(this.OperationTimeout);

            RelayEventSource.Log.ObjectConnecting(traceSource, trackingContext);
            var webSocket = this.ClientWebSocketFactory.Create();
            try
            {
                DefaultWebProxy.ConfigureProxy(webSocket.Options, this.Proxy);
                webSocket.Options.KeepAliveInterval = this.KeepAliveInterval;
                webSocket.Options.SetBuffer(this.ConnectionBufferSize, this.ConnectionBufferSize);
                webSocket.Options.SetRequestHeader(HybridConnectionConstants.Headers.RelayUserAgent, HybridConnectionConstants.ClientAgent);

                if (this.TokenProvider != null)
                {
                    RelayEventSource.Log.GetTokenStart(traceSource);
                    string audience = this.Address.GetComponents(UriComponents.SchemeAndServer | UriComponents.Path, UriFormat.UriEscaped);
                    var token = await this.TokenProvider.GetTokenAsync(audience, TokenProvider.DefaultTokenTimeout).ConfigureAwait(false);
                    RelayEventSource.Log.GetTokenStop(traceSource, token.ExpiresAtUtc);
                    webSocket.Options.SetRequestHeader(RelayConstants.ServiceBusAuthorizationHeaderName, token.TokenString);
                }

                if (requestHeaders != null)
                {
                    foreach (KeyValuePair<string, string> header in requestHeaders)
                    {
                        webSocket.Options.SetRequestHeader(header.Key, header.Value);
                    }
                }

                // Build the websocket uri, e.g. "wss://contoso.servicebus.windows.net:443/$hc/endpoint1?sb-hc-action=connect&sb-hc-id=E2E_TRACKING_ID"
                Uri webSocketUri = HybridConnectionUtility.BuildUri(
                    this.Address.Host,
                    this.Address.Port,
                    this.Address.AbsolutePath,
                    this.Address.Query,
                    HybridConnectionConstants.Actions.Connect,
                    trackingContext.TrackingId);

                using (var cancelSource = new CancellationTokenSource(timeoutHelper.RemainingTime()))
                {
                    await webSocket.ConnectAsync(webSocketUri, cancelSource.Token).ConfigureAwait(false);
                }

                RelayEventSource.Log.ObjectConnected(traceSource, trackingContext);
                return new WebSocketStream(webSocket.WebSocket, trackingContext);
            }
            catch (Exception exception) when (!WebSocketExceptionHelper.IsRelayContract(exception))
            {
                throw RelayEventSource.Log.ThrowingException(
                    WebSocketExceptionHelper.ConvertToRelayContract(exception, trackingContext, webSocket.Response, isListener: false),
                    traceSource);
            }
        }