My current nginx conf: reverse proxy for http and ws protocol

nginx.conf

events {
  worker_connections  1024;
}

http {
  charset UTF-8;

  upstream example {
    server 127.0.0.1:3000;
    keepalive 32;
  }

  proxy_cache_path /var/cache/nginx
    levels=1:2
    max_size=1g
    inactive=24h
    keys_zone=default:1m
    ;

  server {
    listen       80;
    server_name  example.org;

    location / {
      proxy_pass  http://example;
      proxy_cache default;
      proxy_cache_valid 200 1d;
      proxy_redirect off;
      proxy_http_version 1.1;
      proxy_set_header  Host            $host;
      proxy_set_header  X-Real-IP       $remote_addr;
      proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
    }
  }
}