ASP.NET Core dependency injection add multiple HttpClient

Question

services.AddHttpClient("Name", client =>
    {
        client.DefaultRequestHeaders.AcceptLanguage.Clear();
        client.BaseAddress = new Uri('BaseUrl');
    })
    .AddAuthenticationHandler(config).Services
    .AddScoped(sp => sp.GetRequiredService<IHttpClientFactory>()
        .CreateClient('ClientName'));

public partial class StudentClient : IStudentClient
{
    private System.Net.Http.HttpClient _httpClient;

    public UsersClient(System.Net.Http.HttpClient httpClient)
    {
        _httpClient = httpClient;
    }
}

Right now I have given a code to use HttpClient for accessing services. Now the problem is I have multiple base URLs to call different services and I need to configure that as well. so how can I implement it?

Dimitris Maragkos · Accepted Answer · 2023-06-02 18:11:58Z

9

You can have multiple named http clients:

services.AddHttpClient("Name", client =>
{
    client.DefaultRequestHeaders.AcceptLanguage.Clear();
    client.BaseAddress = new Uri('BaseUrl');
});

services.AddHttpClient("GitHub", client =>
{
    client.BaseAddress = new Uri("https://api.github.com/");
});

Access a specific client using IHttpClientFactory:

[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    private readonly IHttpClientFactory _httpClientFactory;

    public WeatherForecastController(IHttpClientFactory httpClientFactory)
    {
        _httpClientFactory = httpClientFactory;
    }

    [HttpGet]
    public IEnumerable<WeatherForecast> Get()
    {
        var httpClient = _httpClientFactory.CreateClient("GitHub");
        
        // use the http client to fetch data
    }
}

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/http-requests?view=aspnetcore-6.0#named-clients

edited Jun 2, 2023 at 18:11

answered Sep 14, 2022 at 18:54

Dimitris Maragkos

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1 Comment

Matteo Pietro Peru Over a year ago

doing this seems like the IHttpClientFactory type is not registered on container so the application throws an exception. If i inject the HttpClient type directly works correctly but i can't define the specific client i want to use

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