public function loadCacheDetails()
    {
        $cacheFile = md5($this->url);
        $this->fileName = $this->saveFolder . $cacheFile;
        $this->fileJson = $this->fileName . ".json";
        if (is_readable($this->fileJson)) {
            $this->cache = json_decode(file_get_contents($this->fileJson), true);
        }
    }