AJAX auth errors listener for Symfony2

AjaxAuthenticationListener.php

<?php
namespace Application\ProdrepHelperBundle\Component\Event;

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Security\Core\Exception\AuthenticationException;
use Symfony\Component\Security\Core\Exception\AccessDeniedException;
use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
/**
 */
class AjaxAuthenticationListener
{

    /**
     * Handles security related exceptions.
     *
     * @param GetResponseForExceptionEvent $event An GetResponseForExceptionEvent instance
     */
    public function onCoreException(GetResponseForExceptionEvent $event)
    {
        $exception = $event->getException();
        $request = $event->getRequest();

        if ($request->isXmlHttpRequest()) {
            if ($exception instanceof AuthenticationException || $exception instanceof AccessDeniedException) {
                $event->setResponse(new Response('', 403));
            }
        }
    }
}

base.js

$(document).ready(function() {
    $(document).ajaxError(function (event, jqXHR) {
        if (403 === jqXHR.status) {
            window.location.reload();
        }
    });
});

Note that returning it should return an http code 401 instead to be conform with the http standard