aspnet/Microsoft.Extensions.Httpv10.0.2
✓ Verified.NET FW4.6.2.NET 10.0.NET 11.0.NET Std2.0
The HttpClient factory is a pattern for configuring and retrieving named HttpClients in a composable way. The HttpClient factory provides extensibility to plug in DelegatingHandlers that address cross-cutting concerns such as service location, load balancing, and reliability. The default HttpClient factory provides built-in diagnostics and logging and manages the lifetimes of connections in a performant way. Commonly Used Types: System.Net.Http.IHttpClientFactory
Get Started
$ dotnet add package Microsoft.Extensions.HttpReadme
About
<!-- A description of the package and where one can find more documentation -->Microsoft.Extensions.Http package provides AddHttpClient extension methods for IServiceCollection, IHttpClientFactory interface and its default implementation. This provides the ability to set up named HttpClient configurations in a DI container and later retrieve them via an injected IHttpClientFactory instance.
Key Features
<!-- The key features of this package -->- The package allows to fluently set up multiple
HttpClientconfigurations for applications that use DI viaAddHttpClientextension method. HttpClientFactorycachesHttpMessageHandlerinstances per configuration name, which allows to reuse resources betweenHttpClientinstances to avoid port exhaustion.HttpClientFactorymanages lifetime ofHttpMessageHandlerinstances and recycles connections to track DNS changes.
How to Use
<!-- A compelling example on how to use this package with code, as well as any specific guidelines for when to use the package -->Note that lifetime management of HttpClient instances created by HttpClientFactory is completely different from instances created manually. The strategies are to use either short-lived clients created by HttpClientFactory or long-lived clients with PooledConnectionLifetime set up. For more information, see the HttpClient lifetime management section in the conceptual docs and Guidelines for using HTTP clients.
Configuring HttpClient
builder.Services.AddHttpClient("foo"); // adding an HttpClient named "foo" with a default configuration
builder.Services.AddHttpClient("example", c => c.BaseAddress = new Uri("https://www.example.com")) // configuring HttpClient itself
.AddHttpMessageHandler<MyAuthHandler>() // adding additional delegating handlers to form a message handler chain
.ConfigurePrimaryHttpMessageHandler(b => new HttpClientHandler() { AllowAutoRedirect = false }) // configuring primary handler
.SetHandlerLifetime(TimeSpan.FromMinutes(30)); // changing the handler recycling interval