Return Gone when IsCancellationRequested

CancellationDelegatingHandler.cs

    /// <summary>
    /// Returns the specified code when the CancellationToken is canceled
    /// </summary>
    public sealed class CancellationDelegatingHandler : DelegatingHandler
    {

        readonly HttpStatusCode _canceledCode;

        public CancellationDelegatingHandler(HttpStatusCode canceledCode = HttpStatusCode.Gone)
        {
            _canceledCode = canceledCode;
        }

        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            HttpResponseMessage GetResponse(Task<HttpResponseMessage> task) => cancellationToken.IsCancellationRequested ? new HttpResponseMessage(_canceledCode) : task.Result;
            return base.SendAsync(request, cancellationToken).ContinueWith(GetResponse, TaskContinuationOptions.ExecuteSynchronously);
        }

    }