ASP.NET Core–Avoid AutoRedirect in named or typed httpclients

In ASP.NET Core I typically avoid to use the HttpClientFactory directly but instead I use the named or typed httpclients.

You can configure the client using the AddHttpClient method(in case of named clients):

	services.AddHttpClient("github", c =>
	{
	c.BaseAddress = new Uri("https://api.github.com/");
	// Github API versioning
	c.DefaultRequestHeaders.Add("Accept", "application/vnd.github.v3+json");
	// Github requires a user-agent
	c.DefaultRequestHeaders.Add("User-Agent", "HttpClientFactory-Sample");
	});

view raw AddHttpClient.cs hosted with ❤ by GitHub

or inside the constructur (in case of typed clients):

	public class GitHubService
	{
	public HttpClient Client { get; }
	public GitHubService(HttpClient client)
	{
	client.BaseAddress = new Uri("https://api.github.com/");
	// GitHub API versioning
	client.DefaultRequestHeaders.Add("Accept",
	"application/vnd.github.v3+json");
	// GitHub requires a user-agent
	client.DefaultRequestHeaders.Add("User-Agent",
	"HttpClientFactory-Sample");
	Client = client;
	}
	}

view raw TypedClient.cs hosted with ❤ by GitHub

This provides proper encapsulation and isolation of the configuration of each httpclient.

But what if you want more control on the HttpClient behavior? For example, you want to disable AutoRedirect on the HttpClient. That is not possible through the configuration above.

In that case you can use the ConfigurePrimaryHttpMessageHandler extension method.

For a named client:

	public void ConfigureServices(IServiceCollection services)
	{
	services.AddHttpClient("github")
	.ConfigurePrimaryHttpMessageHandler(() =>
	{
	return new HttpClientHandler()
	{
	AllowAutoRedirect = false,
	};
	});
	}

view raw ConfigureNamedClient.cs hosted with ❤ by GitHub

For a typed client:

	public void ConfigureServices(IServiceCollection services)
	{
	services.AddHttpClient<GithubService>()
	.ConfigurePrimaryHttpMessageHandler(() =>
	{
	return new HttpClientHandler()
	{
	AllowAutoRedirect = false,
	};
	});
	}

view raw ConfigureTypedClient.cs hosted with ❤ by GitHub