public function handle(RequestInterface $request, ResponseInterface $response, FilterChainInterface $filterChain)
{
$key = $this->getCacheKey($request);
if (!empty($key)) {
$item = $this->cache->getItem($key);
if ($item->isHit()) {
// serve cache response
$resp = $item->get();
$response->setHeaders($resp['headers']);
$response->getBody()->write($resp['body']);
} else {
$filterChain->handle($request, $response);
// save response
$resp = array('headers' => $this->getCacheHeaders($response), 'body' => Util::toString($response->getBody()));
$item->set($resp, $this->ttl);
$this->cache->save($item);
}
} else {
// if we have no key we can not use a cache
$filterChain->handle($request, $response);
}
}
