protected override async Task SendAsync()

in src/Microsoft.Azure.SignalR.Management/Resilient/RetryHttpMessageHandler.cs [28:75]
47 lines of code
7 McCabe index (conditional complexity)

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        IList<Exception>? exceptions = null;
        IEnumerator<TimeSpan>? delays = null;
        do
        {
            Exception? ex;
            try
            {
                var response = await base.SendAsync(request, cancellationToken);
                if (_canRetry(response.StatusCode))
                {
                    var innerException = new HttpRequestException(
                $"Response status code does not indicate success: {(int)response.StatusCode} ({response.ReasonPhrase})");
                    ex = new AzureSignalRRuntimeException(request.RequestUri?.ToString(), innerException);
                    response.Dispose();
                }
                else
                {
                    return response;
                }
            }
            catch (TaskCanceledException operationCanceledException) when (!cancellationToken.IsCancellationRequested && operationCanceledException.InnerException is TimeoutException)
            {
                // Thrown by our timeout handler
                ex = operationCanceledException;
            }
            delays ??= _retryDelayProvider.GetDelays().GetEnumerator();
            if (!delays.MoveNext())
            {
                if (exceptions == null)
                {
                    throw ex;
                }
                else
                {
                    exceptions.Add(ex);
                    throw new AzureSignalRRuntimeException(request.RequestUri?.ToString(), new AggregateException(exceptions));
                }
            }
            else
            {
                exceptions ??= new List<Exception>();
                exceptions.Add(ex);
            }
            await Task.Delay(delays.Current, cancellationToken);
        } while (true);
    }