code: def update(self, url, cache_info=None):
          
          key = hashlib.md5(url).hexdigest()
          access_time = None
          if not cache_info:
              cache_info = CacheInfo()
          if not access_time:
              cache_info.access_time = now_utc()
          self._cache_meta_set(key, cache_info.to_dict())
docs: Update cache information for url
  
          :param url: Update for this url
          :type url: str | unicode
          :param cache_info: Cache info
          :type cache_info: floscraper.models.CacheInfo
          :rtype: None