[c#] How can I tell when HttpClient has timed out?

As of .NET 5, the implementation has changed. HttpClient still throws a TaskCanceledException, but now wraps a TimeoutException as InnerException. So you can easily check whether a request was canceled or timed out (code sample copied from linked blog post):

try
{
    using var response = await _client.GetAsync("http://localhost:5001/sleepFor?seconds=100");
}
// Filter by InnerException.
catch (TaskCanceledException ex) when (ex.InnerException is TimeoutException)
{
    // Handle timeout.
    Console.WriteLine("Timed out: "+ ex.Message);
}
catch (TaskCanceledException ex)
{
    // Handle cancellation.
    Console.WriteLine("Canceled: " + ex.Message);   
}

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