docs: def get_page_labels(self, page_id, prefix=None, start=None, limit=None):
          """
          Returns the list of labels on a piece of Content.
          :param page_id: A string containing the id of the labels content container.
          :param prefix: OPTIONAL: The prefixes to filter the labels with {@see Label.Prefix}.
                                  Default: None.
          :param start: OPTIONAL: The start point of the collection to return. Default: None (0).
          :param limit: OPTIONAL: The limit of the number of labels to return, this may be restricted by
                              fixed system limits. Default: 200.
          :return: The JSON data returned from the content/{id}/label endpoint, or the results of the
                   callback. Will raise requests.HTTPError on bad input, potentially.
          """
          url = 'rest/api/content/{id}/label'.format(id=page_id)
          params = {}
          if prefix:
              params['prefix'] = prefix
          if start is not None:
              params['start'] = int(start)
          if limit is not None:
              params['limit'] = int(limit)
          return self.get(url, params=params)