我花了2天的时间试图让CORS在前面使用我的Angular，在后面使用.Net 6 Core，我哭了。
我创建了一个简单的angular应用程序。只是一个“get”，它击中了我的后端API。在我的后端API中，我创建了一个简单的项目，我在我的program.cs中这样做了：

using Microsoft.AspNetCore.Authentication.Negotiate;

var builder = WebApplication.CreateBuilder(args);

var policyName = "_myAllowSpecificOrigins";

builder.Services.AddCors(options =>
{
    options.AddPolicy(name: policyName,
        builder =>
        {
            builder
            .WithMethods("POST")
            .WithOrigins("http://localhost:4200");
            //.AllowAnyOrigin()
        });
});

builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

builder.Services.AddAuthentication(NegotiateDefaults.AuthenticationScheme)
   .AddNegotiate();

var app = builder.Build();

app.UseCors(policyName);

app.UseAuthentication();
app.UseAuthorization();

app.MapControllers();

app.Run();

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在我的简单控制器中：

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Cors;
using Microsoft.AspNetCore.Mvc;

namespace WebApplication1.Controllers
{
    [EnableCors("_myAllowSpecificOrigins")]
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };

        private readonly ILogger<WeatherForecastController> _logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            _logger = logger;
        }

        [HttpGet(Name = "GetWeatherForecast")]
        public IEnumerable<WeatherForecast> Get()
        {
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = Random.Shared.Next(-20, 55),
                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
            })
            .ToArray();
        }
    }
}

型
当我在localhost中测试时，我可以访问get结果：
x1c 0d1x的数据
即使我没有把GET放在withMethods中。
如果我把.WithOrigins("http://hhhhhh:4200");
我得到

当我把Angular和.Net Core应用程序放在IIS中时，它总是工作，而我把.WithOrigins("http://localhost:4200");我尝试了很多东西，但网站总是工作，我从来没有得到消息'No ' call-Control-Allow-Origin' header is present on the requested resource.'我如何设置IIS？
请帮帮忙！！谢谢。