namespace CorsTest
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var builder = WebApplication.CreateBuilder(args);

            builder.Services.AddCors(options =>
            {
                options.AddPolicy(name: "MyAllowSpecificOrigins", policy =>                                  {
                    policy.AllowAnyOrigin();
                });
            });

            // Add services to the container.

            builder.Services.AddControllers();
            // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
            builder.Services.AddEndpointsApiExplorer();
            builder.Services.AddSwaggerGen();

            var app = builder.Build();

            // Configure the HTTP request pipeline.
            if (app.Environment.IsDevelopment())
            {
                app.UseSwagger();
                app.UseSwaggerUI();
            }

            app.UseHttpsRedirection();

            app.UseCors("MyAllowSpecificOrigins");

            app.UseAuthorization();

            app.MapControllers();

            app.Run();
        }
    }
}

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请考虑上面的代码，它与WebAPI 2启动模板完全相同，并添加了以下片段

builder.Services.AddCors(options =>
{
    options.AddPolicy(name: "MyAllowSpecificOrigins", policy =>                                  {
        policy.AllowAnyOrigin();
    });
});

app.UseCors("MyAllowSpecificOrigins");

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这些片段是直接从MSDN复制的。然而，它不能正常工作。当我试图在Swagger中触发请求时，Access-Control-Allow-Origin头部丢失，而我希望响应中包含类似Access-Control-Allow-Origin: *的内容。提前感谢您的任何建议

的数据