public function postLogout (Request $request)
    {
        if ($redirect = $request->getSession ()->get ('post-login-redirect'))
        {
            $request->getSession ()->set ('post-login-redirect', null);
            $request->getSession ()->set ('cancel-login-redirect', null);

            return Response::redirect ($redirect);
        }

        return Response::redirect (URLBuilder::getURL ('/'));
    }