我已经看了几个文件在启用跨原产地请求和所以回答这里，但我仍然没有得到正确的。 还跟随安装的IIS CORS模块

我有一个。NET core api 3.1在AWS EC2 Windows Server 2016数据中心的IIS上运行，endpoint如https://6.13.21.111/api/user/authenticate。 我有一个angular 8前端应用程序运行在AWS Amplify url上，比如https://tests.d1nkxxfifp945dd.myapp.com。

CORS策略阻止了从起源“https://tests.d1nkxxfifp945dd.myapp.com”访问位于“https://6.13.21.111/api/user/authenticate”得XMLHttpRequest:对预飞行请求得响应未通过访问控制检查:请求得资源上不存在“Access-Control-Allow-Origin”标头。 zone.js:3372 POST https://6.13.21.111/api/users/authenticate net::err_failed

当我从http://localhost:4200/向endpoint发送请求时，也会遇到同样的问题。我已经设置了以下内容

启动cs

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

    readonly string MyAllowSpecificOrigins = "_myAllowSpecificOrigins";

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddCors(options =>
        {
            options.AddPolicy(name: MyAllowSpecificOrigins,
                    builder =>
                    {
                        builder.AllowAnyOrigin()
                            .AllowAnyHeader()
                            .AllowAnyMethod();
                    });
        });

        services.AddControllers();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_3_0);
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseRouting();
        app.UseCors(MyAllowSpecificOrigins);
        app.UseAuthentication();

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

用户控制器

[Route("api/[controller]")]
[EnableCors("MyAllowSpecificOrigins")]
[ApiController]
public class UsersController : ControllerBase
{

    private IUserService _userService;

    public UsersController(IUserService userService)
    {
        _userService = userService;

    }

    [HttpPost("authenticate")]
    public Task<ApiResponse> Authenticate([FromBody]UserRequest userRequest)
    {
        return _userService.Authenticate(userRequest);
    }

}