docs: def enable_request_loader():
      """
      Enable request loader
      Optional user loader based on incomin request object. This is useful to
      enable on top of default user loader if you want to authenticate API
      requests via bearer token header.
      :return:
      """
      @login_manager.request_loader
      def load_user_from_request(request):
          user = None
          auth = request.headers.get('Authorization')
          if auth and auth.startswith('Bearer'):
              try:
                  token = auth[7:]
                  user = user_service.get_user_by_token(token)
              except x.UserException as exception:
                  msg = 'JWT token login failed for [{ip}] with message: [{msg}]'
                  msg = msg.format(
                      ip=request.environ['REMOTE_ADDR'],
                      msg=str(exception)
                  )
                  current_app.logger.log(msg=msg, level=logging.INFO)
                  abort(401, description=str(exception))
  
          return user