HttpClient – A task was cancelled?

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There’s 2 likely reasons that a TaskCanceledException would be thrown:

  1. Something called Cancel() on the CancellationTokenSource associated with the cancellation token before the task completed.
  2. The request timed out, i.e. didn’t complete within the timespan you specified on HttpClient.Timeout.

My guess is it was a timeout. (If it was an explicit cancellation, you probably would have figured that out.) You can be more certain by inspecting the exception:

try
{
    var response = task.Result;
}
catch (TaskCanceledException ex)
{
    // Check ex.CancellationToken.IsCancellationRequested here.
    // If false, it's pretty safe to assume it was a timeout.
}

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