code: def register_default_processors(cls, frontend_editing=None):
          
          super(Page, cls).register_default_processors()
  
          if frontend_editing:
              cls.register_request_processor(
                  edit_processors.frontendediting_request_processor,
                  key='frontend_editing')
              cls.register_response_processor(
                  edit_processors.frontendediting_response_processor,
                  key='frontend_editing')
docs: Register our default request processors for the out-of-the-box
          Page experience.
  
          Since FeinCMS 1.11 was removed from core.