ÿØÿàJFIFÿþ ÿÛC       ÿÛC ÿÀÿÄÿÄ"#QrÿÄÿÄ&1!A"2qQaáÿÚ ?Øy,æ/3JæݹÈ߲؋5êXw²±ÉyˆR”¾I0ó2—PI¾IÌÚiMö¯–þrìN&"KgX:Šíµ•nTJnLK„…@!‰-ý ùúmë;ºgµŒ&ó±hw’¯Õ@”Ü— 9ñ-ë.²1<yà‚¹ïQÐU„ہ?.’¦èûbß±©Ö«Âw*VŒ) `$‰bØԟ’ëXÖ-ËTÜíGÚ3ð«g Ÿ§¯—Jx„–’U/ÂÅv_s(Hÿ@TñJÑãõçn­‚!ÈgfbÓc­:él[ðQe 9ÀPLbÃãCµm[5¿ç'ªjglå‡Ûí_§Úõl-;"PkÞÞÁQâ¼_Ñ^¢SŸx?"¸¦ùY騐ÒOÈ q’`~~ÚtËU¹CڒêV  I1Áß_ÿÙ * * This code is partially based on the Rack-Cache library by Ryan Tomayko, * which is released under the MIT license. * (based on commit 02d2b48d75bcb63cf1c0c7149c077ad256542801) * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\HttpKernel\HttpCache; use Symfony\Component\HttpFoundation\Response; /** * EsiResponseCacheStrategy knows how to compute the Response cache HTTP header * based on the different ESI response cache headers. * * This implementation changes the master response TTL to the smallest TTL received * or force validation if one of the ESI has validation cache strategy. * * @author Fabien Potencier */ class EsiResponseCacheStrategy implements EsiResponseCacheStrategyInterface { private $cacheable = true; private $embeddedResponses = 0; private $ttls = array(); private $maxAges = array(); /** * {@inheritdoc} */ public function add(Response $response) { if ($response->isValidateable()) { $this->cacheable = false; } else { $this->ttls[] = $response->getTtl(); $this->maxAges[] = $response->getMaxAge(); } $this->embeddedResponses++; } /** * {@inheritdoc} */ public function update(Response $response) { // if we have no embedded Response, do nothing if (0 === $this->embeddedResponses) { return; } // Remove validation related headers in order to avoid browsers using // their own cache, because some of the response content comes from // at least one embedded response (which likely has a different caching strategy). if ($response->isValidateable()) { $response->setEtag(null); $response->setLastModified(null); $this->cacheable = false; } if (!$this->cacheable) { $response->headers->set('Cache-Control', 'no-cache, must-revalidate'); return; } $this->ttls[] = $response->getTtl(); $this->maxAges[] = $response->getMaxAge(); if (null !== $maxAge = min($this->maxAges)) { $response->setSharedMaxAge($maxAge); $response->headers->set('Age', $maxAge - min($this->ttls)); } $response->setMaxAge(0); } }