Как установить статус Ajax нет ответа

Question

когда возникает ошибка в actionresult, который вызывается запросом ajax, а затем в классе handlemeroratribute для обычного пользователя, я хочу установить статус custom для ответа ajax.

public class MyHandleError : HandleErrorAttribute
{
    public override void OnException(ExceptionContext filterContext)
    {
        filterContext.ExceptionHandled = true;

        var ex = filterContext.Exception;

        while (ex.InnerException != null)
            ex = ex.InnerException;

        // if angular made request to action and error raise then responed in 
        // http status code to tell it that it was a error
        if (filterContext.HttpContext.Request.IsAjaxRequest()) 
        {
            filterContext.HttpContext.ClearError();
            filterContext.HttpContext.Response.Clear();
            filterContext.HttpContext.Response.ClearHeaders();
            filterContext.HttpContext.Response.ClearContent();
            filterContext.HttpContext.Response.StatusCode = 996;
            filterContext.HttpContext.Response.StatusDescription = "test";
            filterContext.Result = new System.Web.Mvc.HttpStatusCodeResult(996, ex.Message.ToString()); 
        }
        else 
        { 
            // if user directly made request (like url request) then just
            // display them a plane message on screen
            filterContext.Result = new RedirectResult("~/Home/Error");
            //filterContext.Result = new ContentResult() { Content= ex.Message.ToString() };                
        }
        base.OnException(filterContext);
    }

    public string r(string a)
    {
        return a;
    }
}

в javascript, который я всегда получал error.status = -1

function exceptionAjax(error) {
    console.log('error', error);

    //when user is not log in 
    if (error.status === 999) { 
        window.location.href = '/account/login?returnUrl=/Accounts/ChartOfAccountsType/Index'; 
    }
    // when logged in but not authorized by role
    else if (error.status === 998) { 
        window.location.href = '/account/Denied'; 
    }
    // authorized by role but not have permission to use that action
    else if (error.status === 997) { 
        setOperationMessage('You Dont have sufficient privileges to perform this operation', 1); 
    }
    //any other exception raise backend                 
    else if (error.status === 996) { 
        setOperationMessage(error.statusText, 1); 
    }
    //any other exception raise like 404 not found etc
    else { 
        setOperationMessage('Some thing went wrong', 3); 
    }
}