code: def _on_stackexchange_request(self, future, response):
          
          content = escape.json_decode(response.body)
          if 'error' in content:
              future.set_exception(Exception('StackExchange error: %s' %
                                             str(content['error'])))
              return
          future.set_result(content)
docs: Invoked as a response to the StackExchange API request. Will decode
          the response and set the result for the future to return the callback or
          raise an exception