/**
* Creates a request to use for revalidation
*
* @param RequestInterface $request Request
* @param Response $response Response to revalidate
*
* @return RequestInterface returns a revalidation request
*/
protected function createRevalidationRequest(RequestInterface $request, Response $response)
{
$revalidate = clone $request;
$revalidate->removeHeader('Pragma')->removeHeader('Cache-Control');
if ($response->getLastModified()) {
$revalidate->setHeader('If-Modified-Since', $response->getLastModified());
}
if ($response->getEtag()) {
$revalidate->setHeader('If-None-Match', $response->getEtag());
}
// Remove any cache plugins that might be on the request to prevent infinite recursive revalidations
$dispatcher = $revalidate->getEventDispatcher();
foreach ($dispatcher->getListeners() as $eventName => $listeners) {
foreach ($listeners as $listener) {
if (is_array($listener) && $listener[0] instanceof CachePlugin) {
$dispatcher->removeListener($eventName, $listener);
}
}
}
return $revalidate;
}
