Override default Polly/resilience policy set in ASP.NET Aspire

I have an ASP.NET Aspire application which registers default resillience

builder.Services.ConfigureHttpClientDefaults(http =>
{
    // Turn on resilience by default
    http.AddStandardResilienceHandler();

    // Turn on service discovery by default
    http.AddServiceDiscovery();
});

Which is all fine and good good and I don't want to remove it.

But for a specific typed client, I want to disable these policies and use my own policies.

builder.Services.AddHttpClient<MyService>(client =>
{
    client.BaseAddress = new Uri("http://example.com", UriKind.Absolute);
})
.AddPolicyHandler(Policy<HttpResponseMessage>
    .Handle<HttpRequestException>()
    .OrResult(msg => msg.StatusCode == HttpStatusCode.BadGateway
                    || msg.StatusCode == HttpStatusCode.ServiceUnavailable
                    || msg.StatusCode == HttpStatusCode.GatewayTimeout)
    .CircuitBreakerAsync(5, TimeSpan.FromSeconds(15))
);

But its not working, the default policy still applies (which has timeout policy of 10 seconds). I can't find any way to disable it, as there's no .ClearPolicies() method or similar.

Any way to do this, without removing the defaults?

Seems you are not the first person to encounter this issue. I can see they tried to get an API into .NET 9 called RemoveAllResilienceHandlers but that was marked experimental and looks to have been removed in .NET 10. However, this discussion also has a fix you can use:

public static class HttpClientBuilderExtensions
{
    /// <summary>
    /// Remove already configured resilience handlers
    /// </summary>
    /// <param name="builder">The builder instance.</param>
    /// <returns>The value of <paramref name="builder" />.</returns>
    public static IHttpClientBuilder ClearResilienceHandlers(
        this IHttpClientBuilder builder)
    {
        builder.ConfigureAdditionalHttpMessageHandlers(static (handlers, _) =>
        {
            for (int i = 0; i < handlers.Count;)
            {
                if (handlers[i] is ResilienceHandler)
                {
                    handlers.RemoveAt(i);
                    continue;
                }
                i++;
            }
        });
        return builder;
    }
}

And now you can do something like this:

builder.Services
    .AddHttpClient<MyService>(...)
    .ClearResilienceHandlers()
    .AddPolicyHandler(...);