asp.net core 跨域配置不起作用的原因分析及解决方案

var  MyAllowSpecificOrigins = "_myAllowSpecificOrigins";
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddCors(options =>
{
    options.AddPolicy(name: MyAllowSpecificOrigins,
                      policy  =>
                      {
                          policy.WithOrigins("http://example.com",
                                              "http://www.contoso.com");
                      });
});
// services.AddResponseCaching();
builder.Services.AddControllers();
var app = builder.Build();
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseCors(MyAllowSpecificOrigins);
app.UseAuthorization();
app.MapControllers();
app.Run();
 

[EnableCors("any")] //删除这行即可或者策略名改成和中间件一样 _myAllowSpecificOrigins
[Route("api/[controller]/[action]")]
[Authorize]
[ApiController]
public class BaseApiController : ControllerBase
{
}