Request against localhost relative url "Cannot assign requested address"
I am using the same ASP.NET Core docker version and it seems work as described below:
http://host.docker.internal:<port>
Try again and check if it works for you!
For accessing resource from IIS Express, SelfHost and Docker, you could configure HttpClient.BaseAddress with Http Request like below:
public class HomeController : Controller{ private readonly HttpClient httpClient; public HomeController( , IHttpClientFactory httpClientFactory) { this.httpClient = httpClientFactory.CreateClient(); } public async Task<IActionResult> Index() { this.httpClient.BaseAddress = new Uri($"{this.Request.Scheme}://{this.Request.Host}"); var response = await httpClient.SendAsync(new HttpRequestMessage(HttpMethod.Get, "data/some.json")); var result = await response.Content.ReadAsStringAsync(); return View(); }}