<?php
namespace Nelmio\CorsBundle\EventListener;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
/**
* When a response is cacheable the `Vary` header has to include `Origin`.
*/
final class CacheableResponseVaryListener
{
public function onResponse(ResponseEvent $event)
{
$response = $event->getResponse();
if (!$response->isCacheable()) {
return;
}
if (!\in_array('Origin', $response->getVary(), true)) {
$response->setVary(array_merge(['Origin'], $response->getVary()));
}
}
}