server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name example.com;


    location / {
        proxy_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Server $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://127.0.0.1:4001;
    }
}