Nginx Proxy, Hide the real server

nginx.conf

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name myrealdomain.com;

    ssl_certificate_by_lua_block {
      auto_ssl:ssl_certificate()
    }
    ssl_certificate /etc/ssl/resty-auto-ssl-fallback.crt;
    ssl_certificate_key /etc/ssl/resty-auto-ssl-fallback.key;

    location / {
        proxy_set_header        Host $host;
        proxy_set_header        X-Real-IP $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header        X-Forwarded-Proto $scheme;

        proxy_ssl_session_reuse on;
        proxy_send_timeout 300s;

        proxy_pass              https://hiddendomain-or-ip.com;
    }

    location ~ /\.ht {
        deny all;
    }
}