if (keepAuthorization && IsRedirectCode(response.StatusCode) && response.Headers.Location != null)
                {
                    _cancelToken.Cancel();
                    _cancelToken = null;

                    // if explicit count was provided, reduce it for this redirection.
                    if (WebSession.MaximumRedirection > 0)
                    {
                        WebSession.MaximumRedirection--;
                    }
                    // For selected redirects that used POST, GET must be used with the
                    // redirected Location.
                    // Since GET is the default; POST only occurs when -Method POST is used.
                    if (Method == WebRequestMethod.Post && IsRedirectToGet(response.StatusCode))
                    {
                        // See https://msdn.microsoft.com/library/system.net.httpstatuscode(v=vs.110).aspx
                        Method = WebRequestMethod.Get;
                    }

                    currentUri = new Uri(request.RequestUri, response.Headers.Location);
                    // Continue to handle redirection
                    using (client = GetHttpClient(handleRedirect: true))
                    using (HttpRequestMessage redirectRequest = GetRequest(currentUri))
                    {
                        response = GetResponse(client, redirectRequest, keepAuthorization);
                    }
                }

response = client.SendAsync(req, HttpCompletionOption.ResponseHeadersRead, _cancelToken.Token).GetAwaiter().GetResult();

          if (WebSession.MaximumRedirection > 0 && IsRedirectCode(response.StatusCode) && response.Headers.Location != null)
                {
                    _cancelToken.Cancel();
                    _cancelToken = null;

                    // if explicit count was provided, reduce it for this redirection.
                    if (WebSession.MaximumRedirection > 0)
                    {
                        WebSession.MaximumRedirection--;
                    }
                    // For selected redirects that used POST, GET must be used with the
                    // redirected Location.
                    // Since GET is the default; POST only occurs when -Method POST is used.
                    if (Method == WebRequestMethod.Post && IsRedirectToGet(response.StatusCode))
                    {
                        // See https://msdn.microsoft.com/library/system.net.httpstatuscode(v=vs.110).aspx
                        Method = WebRequestMethod.Get;
                    }

                    currentUri = new Uri(request.RequestUri, response.Headers.Location);
                    // Continue to handle redirection
                    using (client = GetHttpClient(handleRedirect: true))
                    using (HttpRequestMessage redirectRequest = GetRequest(currentUri))
                    {
                        response = GetResponse(client, redirectRequest, keepAuthorization);
                    }
                }