nsupdate.info/docs/examples/nginx_gunicorn/nginx.conf

upstream nsupdate_server {
  server unix:/srv/nsupdate/run/gunicorn.sock fail_timeout=0;
}

server {
    listen       :80;
    server_name  www.nsupdate.info;
    return       301 http://nsupdate.info$request_uri;
}

server {
    listen :80;
    listen [::]:80;
    server_name nsupdate.info ipv4.nsupdate.info ipv6.nsupdate.info;

    access_log /srv/nsupdate/logs/nginx-access.log;
    error_log /srv/nsupdate/logs/nginx-error.log;

    root /srv/nsupdate/htdocs/;

    location / {
        try_files $uri @nsupdate;
    }

    location @nsupdate {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Host $http_host;
        proxy_redirect off;
        proxy_pass http://nsupdate_server;
    }

    error_page 500 502 503 504 /500.html;
}