仅对于想要过滤引荐来源网址而不是IP地址的任何人，我们可以使用以下中间件：
from django.conf import settings
from django import http
class AllowHostsMiddleware(object):
def process_request(self, request):
referer_url = request.Meta.get('HTTP_REFERER','')
if referer_url.startswith(settings.ALLOWED_REFERER_URL):
return None
return http.HttpResponseForbidden('<h1>Forbidden</h1>')
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