.netcore 3.1 里webapi跨域请求在服务器上被拦截

[qxyywy]

本地startup.cs里代码如下：

//允许跨域
            services.AddCors(p =>
            {
                p.AddPolicy("vipxwkservice", option =>
                {
                    var listorigins = Configuration.GetSection("SiteConfig").GetSection("Origins").Get<string[]>();
#if DEBUG
                    option.AllowAnyOrigin().AllowAnyMethod()
                    .AllowAnyHeader()
                    .WithExposedHeaders(VIPKeys.SESSION_CODE);
#else
                    option.WithOrigins(listorigins)
                    .AllowAnyMethod()
                    .AllowAnyHeader()
                    .WithExposedHeaders(Common.VIPKeys.SESSION_CODE);
#endif
                });
            });

app.UseCookiePolicy();
            app.UseSession();
            app.UseRouting();
            app.UseCors("vipxwkservice");
            app.UseAuthentication();
             app.UseEndpoints(endpoints =>
            {
                //跨域需添加RequireCors方法，cors是在ConfigureServices方法中配置的跨域策略名称
                endpoints.MapControllers().RequireCors("vipxwkservice");
            });


"SiteConfig": {
    "DomainModules": [ "User", "Application", "Admin" ],
    "Origins": [
      "http://localhost:50592",
      "http://192.168.0.23:10030"
    ],
    "AuthorizationConfig": {
      "Audience": "abc",
      "Issuer": "abc",
      "Expires": 43200, //过期分钟数
      "JwtSecurityKey": "www.abc.com@!##$%##" //密匙长度大于等于16位
    }
  }

以上代码在本机配置API为http://192.168.0.23:10031 ，web站点http://192.168.0.23:10030能够正常跨域请求，但安装到一个全新服务器windows2012R2上部署成功后，跨域请求一直被拦截。
响应头里一直没有
Access-Control-Allow-Origin
Access-Control-Expose-Headers


请教各位有经验的指点迷惑

[沫含天下]

这么写 试试

public class Startup
    {

        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            services.AddMvc(options =>
            {

                options.Filters.Add<MyApiFilter>();

            });


            // 设置允许所有来源跨域
            services.AddCors(options => options.AddPolicy("CorsPolicy",
            builder =>
            {
                builder.AllowAnyMethod()
                    .AllowAnyHeader()
                    .SetIsOriginAllowed(_ => true) // =AllowAnyOrigin()
                    .AllowCredentials();
            }));

            // 使用跨域配置
            

        }

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

            ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository");
            XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthorization();
           
            app.UseEndpoints(endpoints =>
            {
                //全局路由配置
                endpoints.MapControllerRoute(name: "default",
                   pattern: "{controller=Index}/{action=Index}/{id?}"
                );
            });

           



        }

        
    }