proxy_pass http://127.0.0.1:3000; # 指定后端地址
proxy_set_header Host $host; #传递真实域名
proxy_set_header X-Real-IP $remote_addr; #传递用户真实 IP
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; #传递完整 IP 链路
proxy_set_header X-Forwarded-Proto $scheme; #传递协议