code: def _get_async_status(self, response):
          
          if self._is_empty(response):
              return None
          body = self._as_json(response)
          return body.get('status')
docs: Attempt to find status info in response body.
  
          :param requests.Response response: latest REST call response.
          :rtype: str
          :returns: Status if found, else 'None'.