server {
    listen       80;
    server_name  pad.example.com;
    root html;
    index index.html index.htm;
    location = / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host $host;
        proxy_pass http://127.0.0.1:9001;
    }
}