nginx configuration virtual host with proxy

nginx.conf

server {
    listen 80 default_server;
    server_name _;

    location / {
        # Proxy pass to Traefik
        proxy_pass http://traefik-host:port;

        # Standard proxy settings
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }

    # Error pages
    error_page  500 502 503 504 /50x.html;
    location = /50x.html {
        root  /usr/share/nginx/html;
    }
}