Can't set up CORS for ASP.NET MVC?

Question

API

I'm trying to make a web api with the ability to upload a file to the server, I found the project
https://cloud.mail.ru/public/82Gs/e65JAeGce
but you can't make cross-domain requests, I tried to fasten CORS -
[System.Web.Http.Cors.EnableCors( origins: "*", headers: "*", methods: "*")]
All request fails, what could be wrong? Or is it the client?

Answer 1

services.AddCors