public function onResponse(ResponseEvent $event)
{
$response = $event->getResponse();
if ($response->isRedirection() || $response->headers->has('Content-Type') && false === strpos($response->headers->get('Content-Type'), 'html') || 'html' !== $event->getRequest()->getRequestFormat()) {
return;
}
$response->setContent($response->getContent() . 'GA CODE');
}
