Using HttpClient via injecting IHttpClientFactory

FactorySample.cs

class ControllerUsingClientFactory
{
  private readonly IHttpClientFactory _httpClientFactory;

  public ControllerUsingClientFactory(IHttpClientFactory clientFactory)
  {
    _httpClientFactory = clientFactory ?? throw new ArgumentNullException(nameof(clientFactory));
  }

  public async Task CallServerAsync()
  {
    HttpClient client = _httpClientFactory.CreateClient("cni");
    var response = await client.GetAsync("/downloads/Racers.xml");
    response.EnsureSuccessStatusCode();
    string content = await response.Content.ReadAsStringAsync();
    Console.WriteLine(content);
  }
}