/**
  * Adds the imported style sheets to the web
  * @param zibo\library\spider\Web $web The spider web
  * @param zibo\library\spider\WebNode $prey The current prey in the web
  * @param string $baseUrl Base URL of the crawl
  * @param string $preyBaseUrl Base URL of the prey
  * @param zibo\library\xml\dom\Document $dom The DOM document of the current prey
  * @return null
  */
 public function bite(Web $web, WebNode $prey, $baseUrl, $preyBaseUrl, Document $dom = null)
 {
     if (!$prey->hasType(WebNode::TYPE_CSS)) {
         return;
     }
     $response = $prey->getResponse();
     if (!$response || $response->getResponseCode() != 200) {
         return;
     }
     $source = $response->getContent();
     if (!$source) {
         return;
     }
     $urls = $this->getImportUrlsFromStyle($source, $baseUrl, $preyBaseUrl);
     foreach ($urls as $url) {
         $link = $web->getNode($url);
         $link->addType(WebNode::TYPE_CSS);
         $link->addReference($prey);
         $prey->addLink($link);
     }
 }