public function onLogoutSuccess(Request $request)
{
// Clear Zend auth
$zendAuth = \Zend_Auth::getInstance();
$zendAuth->clearIdentity();
$referer = $request->headers->get('referer');
// logout from OAuth
$token = new AnonymousToken(null, 'anon.');
$session = $request->getSession();
$request->getSession()->invalidate();
$session->set('_security_oauth_authorize', serialize($token));
$this->securityContext->setToken($token);
$this->unsetNoCacheCookie($request);
return $this->httpUtils->createRedirectResponse($request, $referer);
}