问MVC3中的表单身份验证:如果用户尝试访问未经授权的资源，则返回401 (未经授权)而不是重定向

EN

public class 401AuthorizeAttribute : AuthorizeAttribute
{
    private class Http401Result : ActionResult
    {
        public override void ExecuteResult(ControllerContext context)
        {
            // Set the response code to 401.
            context.HttpContext.Response.StatusCode = 401;
            context.HttpContext.Response.End();
        }
    }

    protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
    {
        filterContext.Result = new Http401Result();
    }
}