How to filter specific endpoint for retry policy using Polly

August 3, 2023

All client requests MyServiceHttpClient will retry. How disable retry policy specific api?

services.AddHttpClient<MyServiceHttpClient>(client =>
{
    /* configuration */
})
.AddPolicyHandler((serviceProvider, request) => 
    HttpPolicyExtensions.HandleTransientHttpError()
        .WaitAndRetryAsync(3, 
            sleepDurationProvider: retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)), 
            onRetry: (outcome, timespan, retryAttempt, context) =>
            {
                serviceProvider.GetService<ILogger<MyServiceHttpClient>>()
                    .LogWarning("Delaying for {delay}ms, then making retry {retry}.", timespan.TotalMilliseconds, retryAttempt);
            }
            ));

>Solution :

You can try using no-op policy:

builder.Services.AddHttpClient<MyServiceHttpClient>(client =>
    {
        /* configuration */
    })
    .AddPolicyHandler((serviceProvider, request) =>
        request.RequestUri.PathAndQuery.StartsWith("/api/") // your predicate
            ? Policy.NoOpAsync<HttpResponseMessage>() // <- no op for matching predicate
            : HttpPolicyExtensions.HandleTransientHttpError()
                .WaitAndRetryAsync(3,
                    sleepDurationProvider: retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)),
                    onRetry: (outcome, timespan, retryAttempt, context) =>
                    {
                        serviceProvider.GetService<ILogger<MyServiceHttpClient>>()
                            .LogWarning("Delaying for {delay}ms, then making retry {retry}.",
                                timespan.TotalMilliseconds, retryAttempt);
                    }
                ));

Or another approach would be to repeat the HandleTransientHttpError logic but with adding corresponding filter.