How to use HttpClientHandler with HttpClientFactory in .NET Core

Question

I want to use the HttpClientFactory that is available in .NET Core 2.1 but I also want to use the HttpClientHandler to utilize the AutomaticDecompression property when creating HttpClients.

I am struggling because the .AddHttpMessageHandler<> takes a DelegatingHandler not a HttpClientHandler.

Does anyone know how to get this to work?

Thanks, Jim

janw · Accepted Answer · 2024-02-17 21:37:50Z

More properly to define primary HttpMessageHandler via ConfigurePrimaryHttpMessageHandler() method of HttpClientBuilder. See example below to configure typed client how.

services.AddHttpClient<TypedClient>()
    .ConfigureHttpClient((sp, httpClient) =>
    {
        var options = sp.GetRequiredService<IOptions<SomeOptions>>().Value;
        httpClient.BaseAddress = options.Url;
        httpClient.Timeout = options.RequestTimeout;
    })
    .SetHandlerLifetime(TimeSpan.FromMinutes(5))
    .ConfigurePrimaryHttpMessageHandler(x => new HttpClientHandler() 
    {
        AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
    })
    .AddHttpMessageHandler(sp => sp.GetService<SomeCustomHandler>().CreateAuthHandler())
    .AddPolicyHandlerFromRegistry(PollyPolicyName.HttpRetry)
    .AddPolicyHandlerFromRegistry(PollyPolicyName.HttpCircuitBreaker);

Also you can define error handling policy via usage of special builders methods of Polly library. In this example policy should be predefined and stored into policy registry service.

public static IServiceCollection AddPollyPolicies(
    this IServiceCollection services, 
    Action<PollyPoliciesOptions> setupAction = null)
{
    var policyOptions = new PollyPoliciesOptions();
    setupAction?.Invoke(policyOptions);

    var policyRegistry = services.AddPolicyRegistry();

    policyRegistry.Add(
        PollyPolicyName.HttpRetry,
        HttpPolicyExtensions
            .HandleTransientHttpError()
            .WaitAndRetryAsync(
                policyOptions.HttpRetry.Count,
                retryAttempt => TimeSpan.FromSeconds(Math.Pow(policyOptions.HttpRetry.BackoffPower, retryAttempt))));

    policyRegistry.Add(
        PollyPolicyName.HttpCircuitBreaker,
        HttpPolicyExtensions
            .HandleTransientHttpError()
            .CircuitBreakerAsync(
                handledEventsAllowedBeforeBreaking: policyOptions.HttpCircuitBreaker.ExceptionsAllowedBeforeBreaking,
                    durationOfBreak: policyOptions.HttpCircuitBreaker.DurationOfBreak));

    return services;
}

djaszczurowski · Accepted Answer · 2018-06-08 06:19:14Z

28

Actually I'm not using automatic decompression but the way to achieve this is to properly register http client

services.AddHttpClient<MyCustomHttpClient>()
   .ConfigureHttpMessageHandlerBuilder((c) =>
     new HttpClientHandler()
     {
        AutomaticDecompression = System.Net.DecompressionMethods.GZip
     }
   )
   .AddHttpMessageHandler((s) => s.GetService<MyCustomDelegatingHandler>())

answered Jun 8, 2018 at 6:19

djaszczurowski

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3 Comments

Georgi Georgiev Over a year ago

Did not work for me . Had to use .ConfigureHttpMessageHandlerBuilder(builder => { builder.PrimaryHandler = new HttpClientHandler() { UseDefaultCredentials = true }; builder.Build(); })

trueboroda Over a year ago

More properly use ConfigurePrimaryHttpMessageHandler() method

Sharparam Over a year ago

The first call to ConfigureHttpMessageHandlerBuilder in your solution does absolutely nothing, that method takes an Action<T> and you're just returning a value which is immediately discarded: learn.microsoft.com/en-us/dotnet/api/…

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