public function splitWithContentIdKey($pattern, $string)
    {
        $array    = [];
        $exploded = explode($pattern, $string);
        foreach ($exploded as $key => $value) {
            $response  = new HttpResponse($value);
            $contentId = $response->getHeader('Content-Id');

            if (null !== $contentId) {
                $array[$contentId] = $value;
            } else {
                $array[$key] = $value;
            }
        }

        return $array;
    }