def vary_on_user(view):
        @wraps(view, assigned=available_attrs(view))
        def inner_func(request, *args, **kwargs):
            request.META['HTTP_DJANGO_USERID'] = request.user.id
            response = view(request, *args, **kwargs)
            patch_vary_headers(response, ('DJANGO_USERID',))
            return response
        return inner_func