MIDDLEWARE =['django.middleware.security.SecurityMiddleware','django.middleware.cache.UpdateCacheMiddleware','django.middleware.gzip.GZipMiddleware','django.contrib.sessions.middleware.SessionMiddleware','django.middleware.locale.LocaleMiddleware''django.middleware.common.CommonMiddleware','django.middleware.csrf.CsrfViewMiddleware','django.contrib.auth.middleware.AuthenticationMiddleware','django.contrib.messages.middleware.MessageMiddleware','django.middleware.cache.FetchFromCacheMiddleware','django.middleware.clickjacking.XFrameOptionsMiddleware',<!--以下两个中间件在settings文件中配置时,会出现:RuntimeError: Model classdjango.contrib.sites.models.Site doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.--><!--'django.contrib.flatpages.middleware.FlatpageFallbackMiddleware',--><!--'django.contrib.redirects.middleware.RedirectFallbackMiddleware',-->]