/**
* Extract the cache HIT/MISS information from the X-Symfony-Cache header.
*
* For this header to be present, the HttpCache must be created with the
* debug option set to true.
*
* @param CacheEvent $event
*/
public function handleDebug(CacheEvent $event)
{
$response = $event->getResponse();
if ($response->headers->has('X-Symfony-Cache')) {
if (false !== strpos($response->headers->get('X-Symfony-Cache'), 'miss')) {
$state = 'MISS';
} elseif (false !== strpos($response->headers->get('X-Symfony-Cache'), 'fresh')) {
$state = 'HIT';
} else {
$state = 'UNDETERMINED';
}
$response->headers->set('X-Cache', $state);
}
}
/**
* Remove the custom TTL header and restore s_maxage from the backup.
*
* @param CacheEvent $e
*/
public function cleanResponse(CacheEvent $e)
{
$response = $e->getResponse();
if (!$response->headers->has($this->ttlHeader) && !$response->headers->has(static::SMAXAGE_BACKUP)) {
return;
}
if ($response->headers->has(static::SMAXAGE_BACKUP)) {
$smaxage = $response->headers->get(static::SMAXAGE_BACKUP);
if ('false' === $smaxage) {
$response->headers->removeCacheControlDirective('s-maxage');
} else {
$response->headers->addCacheControlDirective('s-maxage', $smaxage);
}
}
$response->headers->remove($this->ttlHeader);
$response->headers->remove(static::SMAXAGE_BACKUP);
}
