How to access CookieContainer in HTTPClient instance created via HTTPClientFactory

Question

In an ASP.NET Core 2.2 web API, I want to be able to access CookieContainer from a named HttpClient and not sure how to configure this.

In Startup.cs:

        services
            .AddHttpClient("MyClient")                
            .ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler
            {
                UseProxy = false,
                //CookieContainer = ???
            });

In controller:

public MyController(IOptions<IHttpClientFactory httpClientFactory)
{
   _httpClientFactory = httpClientFactory;
}

public async Task<ObjectResult> Get<T>(string endpoint)
{
   var httpClient = _httpClientFactory.CreateClient("MyClient");
   var response = await httpClient.GetAsync($"{Settings.Url}/{endpoint}");
   //httpClient.CookieContainer ???
}

It's pretty straight forward while using just an instance of HttpClient and associating a CookieContainer with its MessageHandler, e.g.:

var cookieContainer = new CookieContainer();
var handler = new HttpClientHandler() { CookieContainer = cookieContainer };
var client = new HttpClient(handler) { BaseAddress = "http://foo.com/api"}
var result = await client.PostAsync("", content);
//read response cookies
var cookies = cookieContainer.GetCookies(new Uri("http://foo.com/api"));

Wondering how I can read response cookies but via an instance of HttpClient created using IHttpClientFactory.

Answer 1

That's not CookieContainer instance, but you can access raw cookies in response header:

var cookies = response.Headers.GetValues("Set-Cookie");

And you can try to call your request in the browser with open Mozilla dev tool to see if it is truly there.