/**
  * Disable cache when the request contain a "_" paremeter
  * This parameter is set randomly by jQuery to avoid browser cache
  * Cache it quickly leads to thousands cache entries
  */
 public function findRoute($url)
 {
     if ($this->cache && (strpos($this->options['context']['request_uri'], '?_=') || strpos($this->options['context']['request_uri'], '&_='))) {
         // remember the cache and disable it
         $cache = $this->cache;
         $this->cache = null;
         // get the result without cache
         $result = parent::findRoute($url);
         // restore the cache
         $this->cache = $cache;
         return $result;
     } else {
         return parent::findRoute($url);
     }
 }