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Use HttpClientFactory Over HttpClient in .NET

Posted on by Pablo Francesco

Using a straightforward example, let’s examine the advantages of use HttpClientFactory instead of HttpClient directly in.NET Core.

HttpClientFactory: Why Use It?
Consider yourself developing a web application that requires data retrieved from a third-party source. HttpClient can be compared to a delivery service. It becomes unorganized and inefficient if you continually ordering a new delivery service for each request. Having a factory that offers a well-run delivery service, on the other hand, streamlines and increases efficiency.

Direct Use of HttpClient

If you use HttpClient directly, it might look something like this.

public class MyService
{
    private readonly HttpClient _httpClient;
    public MyService()
    {
        _httpClient = new HttpClient(); // New instance every time
    }
    public async Task<string> GetDataAsync()
    {
        var response = await _httpClient.GetStringAsync("https://test.example.com/data");
        return response;
    }
}

Problem: Creating a new HttpClient instance every time can lead to issues like running out of resources.

Using HttpClientFactory

Now, let’s see how using HttpClientFactory makes things easier and more efficient.

Setup

First, you set up HttpClientFactory in your app’s startup configuration. This is like telling your app where to get its delivery service from.

// In Startup.cs or Program.cs
public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // Register HttpClientFactory
        services.AddHttpClient();
    }
}

​​​​​​Use the Factory

Now, in your service class, you use the factory to get HttpClient instances. This is like asking the factory for a delivery service whenever you need it.

public class MyService
{
    private readonly HttpClient _httpClient;
    public MyService(IHttpClientFactory httpClientFactory)
    {
        _httpClient = httpClientFactory.CreateClient(); // Get a managed HttpClient instance
    }
    public async Task<string> GetDataAsync()
    {
        var response = await _httpClient.GetStringAsync("https://test.example.com/data");
        return response;
    }
}

In your application, you tell it to use the factory to provide MyService.

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddHttpClient();
        services.AddTransient<MyService>();
    }
}

And you use MyService like this.

public class MyController : ControllerBase
{
    private readonly MyService _myService;
    public MyController(MyService myService)
    {
        _myService = myService;
    }
    public async Task<IActionResult> Get()
    {
        var data = await _myService.GetDataAsync();
        return Ok(data);
    }
}

Summary

  • Without HttpClientFactory: You’re constantly ordering new delivery services, which can cause problems.
  • With HttpClientFactory: You have a factory that manages your delivery services, making it more efficient and organized.

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