对于有nginx反向代理的请求，需要在nginx配置中添加如下内容：

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

然后在项目代码中获取ip

from flask import request
ip = request.access_route[0] if request.access_route else request.remote_addr

检查ip是不是内网

import ipaddress

def is_lan(ip):
    try:
        return ipaddress.ip_address(ip.strip()).is_private
    except:
        return False