除了xff头以外还可以用的几种请求头
X-Forwarded-For:127.0.0.1
Client-ip:127.0.0.1
X-Client-IP:127.0.0.1
X-Remote-IP:127.0.0.1
X-Rriginating-IP:127.0.0.1
X-Remote-addr:127.0.0.1
HTTP_CLIENT_IP:127.0.0.1
X-Real-IP:127.0.0.1
X-Originating-IP:127.0.0.1
via:127.0.0.1
其中via貌似是专门用来挂代理的(?