map "" $empty {
        default "";
}

server
{
    listen 80;
    listen 443 ssl http2;
    server_name _;

    ssl_ciphers aNULL;
    ssl_certificate data:$empty;
    ssl_certificate_key data:$empty;
    ssl_protocols TLSv1.1 TLSv1.2 TLSv1.3;

    index 404.html;
    root /usr/share/nginx/html;
}