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<?php
namespace Http\Client\Common\Plugin\Cache\Listener;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Cache\CacheItemInterface;
/**
* Adds a header indicating if the response came from cache.
*
* @author Iain Connor <[email protected]>
*/
class AddHeaderCacheListener implements CacheListener
{
/** @var string */
private $headerName;
* @param string $headerName
public function __construct($headerName = 'X-Cache')
$this->headerName = $headerName;
}
* Called before the cache plugin returns the response, with information on whether that response came from cache.
* @param RequestInterface $request
* @param ResponseInterface $response
* @param bool $fromCache Whether the `$response` was from the cache or not.
* Note that checking `$cacheItem->isHit()` is not sufficent to determine this.
* @param CacheItemInterface|null $cacheItem
* @return ResponseInterface
public function onCacheResponse(RequestInterface $request, ResponseInterface $response, $fromCache, $cacheItem)
return $response->withHeader($this->headerName, $fromCache ? 'HIT' : 'MISS');
php-http /
cache-plugin
