How can I handle async exceptions using System.Net.Http.HttpClient with my integration tests?
asynchronous, c#, dotnet-httpclient, unit-testing
Solution
As the previous commenters suggested, your connection is probably timing out. You can set the timeout with `_client.Timeout = timeoutInMilliseconds` before making the GetStringAsync call. However, if it is currently the default (100 seconds) then my guess is that the remote server you are testing against is actually down when this occurs.
More information on the timeout property can be found at: http://msdn.microsoft.com/en-us/library/system.net.http.httpclient.timeout.aspx
Problem
I'm running a suite of integration tests that use `System.Net.HttpClient`. Most of our "act" sections in these tests use this general format: ``` // Arrange // Do some stuff // Act var download = _client .GetStringAsync(testUrl) .Result; // Assert // Does "download" contain what I expected? ``` However, running these tests intermittently yields something like this: ``` System.AggregateException : One or more errors occurred. ----> System.Threading.Tasks.TaskCanceledException : A task was canceled. at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at System.Threading.Tasks.Task`1.get_Result() ``` I realize using `HttpClient` is meant for kicking off things async and isn't a perfect fit for our integration test scenarios where we always tell it to wait. So this leads me to two questions that are somewhat related: - Is using `HttpWebRequest` / `HttpWebResponse` more appropriate for this scenario? - Even if it is, what's the best way to work with `HttpClient` to handle errors on requests kicked off asynchronously?