code: def list_by_ids(self, ids):
          
          ids = utils.coerce_to_list(ids)
          uri = "/%s?ids=%s" % (self.uri_base, ",".join(ids))
          # The API is not consistent in how it returns message lists, so this
          # workaround is needed.
          curr_prkey = self.plural_response_key
          self.plural_response_key = ""
          # BROKEN: API returns a list, not a dict.
          ret = self._list(uri)
          self.plural_response_key = curr_prkey
          return ret
docs: If you wish to retrieve a list of messages from this queue and know the
          IDs of those messages, you can pass in a list of those IDs, and only
          the matching messages will be returned. This avoids pulling down all
          the messages in a queue and filtering on the client side.