code: def supports_site(url):
          
  
          # Follow redirects
          opener = urllib2.build_opener(urllib2.HTTPRedirectHandler)
          redirect = opener.open(url).url
          response = urllib2.urlopen(redirect).read()
  
          # Check if a standard rss feed exists
          return re.search(re_rss, response.decode('utf-8')) is not None
docs: Rss Crawler are supported if by every site containing an rss feed.
  
          Determines if this crawler works on the given url.
  
          :param str url: The url to test
          :return bool: Determines wether this crawler work on the given url