How to get rid of 127.0.0.1 in your generated links

gunicorn+werkzeug-behind-nginx.nginxconf

server {
    # [...]
    location / {
        set $backend_url 'http://127.0.0.1:8000';
        
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;
        proxy_pass $backend_url;
        proxy_redirect $backend_url https://$server_name/;
    }
}