def latest_entry(request,  *args, **kwargs):

        from urllib.parse import urlparse

        # print('latest_entry >>>', request, args, kwargs)

        print(request.get_full_path_info())

        try:

            p = urlparse(request.get_full_path_info())

            project_id = None

            for rec in p.query.split('&'):

                items = str(rec).split('=')

                if items[0] == 'project':

                    project_id = items[1]

                    break

            print('find project id >>>', project_id)

            pro = m.Project.objects.get(id=project_id)

            if pro:

                print('pro.date_updated >>>',pro.date_updated)

                return pro.date_updated

            return datetime.now()

        except:

            print('latest_entry got exception!!!')

            traceback.print_exc()

            return datetime.now()

# 由于list函数第一个参数是self,所以要再包一层。list函数是mixins.ListModelMixin的方法

    @method_decorator(condition(last_modified_func=latest_entry) )

    def list(self, request, *args, **kwargs):

        queryset = self.filter_queryset(self.get_queryset())

        page = self.paginate_queryset(queryset)

        if page is not None:

            serializer = self.get_serializer(page, many=True)

            return self.get_paginated_response(serializer.data)

        serializer = self.get_serializer(queryset, many=True)

        return Response(serializer.data)

参考：

https://docs.djangoproject.com/zh-hans/4.1/topics/conditional-view-processing/