Enabling CORS in ASPNet Core

Startup.cs

using Microsoft.AspNetCore.Cors;  //add reference to the needed library

public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddMvc();
            
            //Add CORS service beloe
            services.AddCors( options => options.AddPolicy("AllowCors",
                builder => {
                    builder.AllowAnyOrigin()
                    .WithMethods("GET","PUT","POST","DELETE")
                    .AllowAnyHeader();
                }
            ));
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            app.UseMvc();
            
            //Add CORS
            app.UseCors("AllowCors");
        }
    }

ValuesController.cs

// Add reference
using Microsoft.AspNetCore.Cors;

namespace Sampl.Controllers
{
    //Enable CORS
    [EnableCors("AllowCors"), Route("api/[controller]")]
    public class ValuesController : Controller
    {
        // Code here...
    }
}