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)
        {
            #region Config
            services.Configure<CorsOption>();
            #endregion
            #region  CORS
            AddCors_1(services);
            //AddCors_2(services);
            //AddCors_3(services);
            //AddCors_4(services);
            #endregion
            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();
            });
        }

        private IServiceCollection AddCors_1(IServiceCollection services)
        {
            services.AddCors(setup =>
            {
                setup.AddPolicy(CorsName, build =>
                {
                    build
                    .AllowAnyOrigin()
                    .AllowAnyMethod()
                    .AllowAnyHeader()
                    .WithExposedHeaders("x-custom-error");
                });
            });

            return services;
        }

        private IServiceCollection AddCors_2(IServiceCollection services)
        {
            services.AddCors(setup =>
           {
               setup.AddPolicy(CorsName, build =>
               {
                   build.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader().WithExposedHeaders("x-custom-error");
               });
           });

            return services;
        }

        private IServiceCollection AddCors_3(IServiceCollection services)
        {
            services.AddCors(setup =>
           {
               setup.AddPolicy(CorsName, build =>
               {
                   build.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader().WithExposedHeaders("x-custom-error");
               });
           });

            return services;
        }

        private IServiceCollection AddCors_4(IServiceCollection services)
        {
            services.AddCors(setup =>
           {
               setup.AddPolicy(CorsName, build =>
               {
                   build.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader().WithExposedHeaders("x-custom-error");
               });
           });
            return services;
        }
    }
}