code: def construct(self, request, service=None, http_args=None, **kwargs):
          
  
          _acc_token = ''
          for _token_type in ['access_token', 'refresh_token']:
              _acc_token = find_token(request, _token_type, service, **kwargs)
              if _acc_token:
                  break
  
          if not _acc_token:
              raise KeyError('No access or refresh token available')
          else:
              request["access_token"] = _acc_token
  
          return http_args
docs: Will add a token to the request if not present
  
          :param request: The request
          :param service_context: A
              :py:class:`oidcservice.service.Service` instance
          :param http_args: HTTP arguments
          :param kwargs: extra keyword arguments
          :return: A possibly modified dictionary with HTTP arguments.