public function getResponse(Request $request) {
        $cacheFilename = $this->calculateRequestFilename($request);

        return $this->getCachedResponse($cacheFilename);
    }
public function getResponse(Request $request) {
        $cacheFilename = $this->calculateRequestFilename($request);

        return $this->getCachedResponse($cacheFilename);
    }
Returns an array caching HTTP headers that should be set for this request e.g.
['If-None-Match' => $matchValue, 'If-Modified-Since' => $modifiedValue]
@param Request $request
@return \Amp\Artax\Response