Why Does My HttpClient Task Throw a 'Task Was Cancelled' Exception?

HttpClient in Action: Resolving "A Task Was Cancelled" Errors

When working with multiple HttpClient tasks simultaneously, you might encounter the confusing "A task was cancelled" error. Understanding the underlying causes of this exception is crucial to resolve it effectively.

Possible Causes:

There are two primary reasons why this error can occur:

1. Explicit Cancellation: The code actively invokes Cancel() on the CancellationTokenSource associated with the task's cancellation token.
2. Timeout: The request exceeds the timeout value specified in HttpClient.Timeout.

Identifying the True Cause:

Examining the exception more closely can help determine the true cause. Consider the following code:

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.
}

If ex.CancellationToken.IsCancellationRequested returns false, it strongly suggests a timeout.

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