django设置了全站缓存后，配置etag无效，请问如何解决？

Question

我配置了USE_ETAGS=True后依然无效，二次访问时直接就调用缓存了。

下面是我的中间件

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.cache.UpdateCacheMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.cache.FetchFromCacheMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.views.decorators.http.ConditionalGetMiddleware',
]

下面是views.py

from django.http import HttpResponse
from django.views.decorators.http import condition
from app2.models import Book


def latest_entry(request,pk):
    return Book.objects.filter(user_id=pk).latest("published").published


def img_etag(request,pk):
    etaghead = hash(str(Book.objects.filter(user_id=pk).latest("published").bookname))
    return str(etaghead)


@condition(etag_func=img_etag,last_modified_func=latest_entry)
def cc(request,pk):
    data = Book.objects.filter(user_id=pk).latest("published").bookname
    return HttpResponse(data)

取消全站缓存后，就condition才起作用。

我想知道全站缓存和condition冲突吗？

如果不冲突的话用该如何解决

多谢多谢了