Why Does My HttpClient Throw a 'A task was cancelled' Error When Running Multiple Tasks?

HttpClient: "A task was cancelled" Error with Multiple Tasks

In HttpClient, when executing multiple tasks concurrently, developers may encounter a "A task was cancelled" error. This error typically occurs due to one of two reasons:

1. Explicit Cancellation:
   The CancellationTokenSource associated with the cancellation token was explicitly cancelled before the task completed.
2. Timeout:
   The task exceeded the timeout specified using HttpClient.Timeout, resulting in an automatic cancellation.

To diagnose the issue, inspect the TaskCanceledException exception:

try
{
    var response = task.Result;
}
catch (TaskCanceledException ex)
{
    if (!ex.CancellationToken.IsCancellationRequested)
    {
        // Timeout is likely the cause
    }
}

If CancellationToken.IsCancellationRequested is false, it is likely that the task timed out. In this case, adjust the HttpClient.Timeout property to allow more time for the task to complete.

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