symfony异常没有返回正确的状态代码

Question

应该使用403状态代码进行响应，但是对于以下代码，我得到了这样的响应：

Full authentication is required to access this resource. (500 Internal Server Error)

use Symfony\Component\Security\Core\Exception\AccessDeniedException;

class MyController extends Controller
{
    private function _accessControl()
    {
        if (false === $this->get('security.context')->isGranted('ROLE_ADMIN')) {
            throw new AccessDeniedException();
        }
    }

这里是API reference for the AccessDeniedException class

和代码：

/**
 * AccessDeniedException is thrown when the account has not the required role.
 *
 * @author Fabien Potencier <fabien@symfony.com>
*/
class AccessDeniedException extends \RuntimeException
{
    public function __construct($message = 'Access Denied', \Exception $previous = null)
    {
        parent::__construct($message, 403, $previous);
    }
}

在我的代码中的同一位置使用throw new HttpException(403);会返回正确的状态代码