CorsStudy/CorsServer/CorsServer.WebApi31/Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace CorsServer.WebApi31
{
    public class Startup
    {
        public const string CorsName = "Any";
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddCors(setup => 
            {
                setup.AddPolicy(CorsName, build => 
                {
                    build.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader().WithExposedHeaders("x-custom-error");
                });
            });
            services.AddControllers();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            //¸ù·¾¶£ºÈ«¾Ö·ÃÎÊÇ°ê¡ http://www.custom.com/PathBase/
            //app.UsePathBase("/api/");

            app.UseRouting();

            app.UseCors(CorsName);

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }
}