code: def _refresh(self, http):
          
          self.devshell_response = _SendRecv()
          self.access_token = self.devshell_response.access_token
          expires_in = self.devshell_response.expires_in
          if expires_in is not None:
              delta = datetime.timedelta(seconds=expires_in)
              self.token_expiry = client._UTCNOW() + delta
          else:
              self.token_expiry = None
docs: Refreshes the access token.
  
          Args:
              http: unused HTTP object