how to re-try request for 401 along with TransientHttpError ( 5XX and 408)

Question

Below code re-try 2 times when we have error from HttpRequestException, 5XX and 408 and it's works fine.

Here I want to re-try for even 401 error? how we can achieve this with Polly?

 services.AddHttpClient(Options.DefaultName)
            .ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler { })
            .AddPolicyHandler(HttpPolicyExtensions.HandleTransientHttpError()
                .WaitAndRetryAsync(2, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt))));

Answer 1

Add .OrResult(r => r.StatusCode == System.Net.HttpStatusCode.Unauthorized) to your code:

services.AddHttpClient(Options.DefaultName)
        .ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler { })
        .AddPolicyHandler(HttpPolicyExtensions.HandleTransientHttpError()
        .OrResult(r => r.StatusCode == System.Net.HttpStatusCode.Unauthorized)
        .WaitAndRetryAsync(2, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt))));

I would suggest rewriting your code like this to make it easier to read:

services.AddHttpClient(Options.DefaultName)
        .AddTransientHttpErrorPolicy(builder => 
            builder
                .OrResult(r => r.StatusCode == System.Net.HttpStatusCode.Unauthorized)
                .WaitAndRetryAsync(2, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt))))
        );