Automatic Test-Cookie

You'd have to elaborate on what the testcookie aims to do ? Or do you mean Centmin Mod 123.09beta01's Nginx Test Cookie nginx module Beta Branch - add testcookie-nginx-module optional support in 123.09beta01 located at kyprizel/testcookie-nginx-module ? Unfortunately that Nginx module is no longer supported by the author so hasn't been updated in years so whether it works, you'd have to figure out. It does seem to compile on Centmin Mod 123.09beta01 with Nginx 1.17.5 at least.

 

that's basically what this guide does Install - Upgrade - Nginx - CentOS 7.x - Anti-DDoS Mitigate: Automatic deploy/config Testcookie module for Centminmod (vCentminmod-DDoS) so yes it's possible but for support/setup you'd need to ask the author of that write up linked.

Or you can do something similar if you use Cloudflare and it's rate limit/firewall rules to challenge visitors. Doing it at Cloudflare level will save you in terms of cpu and server resource usage to handle alot of traffic.

 

oh actually had that link mixed up with what i was thinking about using nginx lua scripting for rate limiting How to limit requests, and ban those hitting the limit not test cookie

for what you're after Cloudflare rate limiting seems easier though it's a billed feature Billing for Cloudflare Rate Limiting