Deploy your own reverse proxy using Nginx on Debian 9.
Instructions for installing different versions of Nginx in Debian 9 Stretch.
Instructions on how to install different versions of Nginx depending on your needs.
Use NGINX to allow specific whitelisted IPs through, and redirect all other IPs to another site.
Here we compare Nginx vs Apache at handling burst workloads and explain why one of them appears to handle it much better than the other.