code: def _add_to_cache(key, value):
      
      if key in _CACHE:
          _CACHE[key].append(value)
      else:
          _CACHE[key] = [_PATTERN, value]
          _CACHE_COUNTER[key] = 0
docs: Internal method to add a new key-value to the local cache.
      :param str key: The new url to add to the cache
      :param str value: The HTTP response for this key.
      :returns: void