== What is that's ==
It's fast_cgi cache from nginx to **never call the slow php web site**. Just it cache the first time the returned page and return always the same. Useful for 95% of content because without login it never change.

== Purge ==
It's total purge each time at 0h0min, and nginx **don't keep more than 24h cache** on 200 (normal page), 301/302 redirection, 404 (not found).

You can manually delete it via:
  rm -Rf /tmp/nginx/*

== When ==
It's enabled by default util you do POST request. Done via login, register, add to card into shop. When you do that, it do **CDIS** cookie and disable the cache.

== Other impact ==
This system **protect against the basic DDOS attacks**, in 2017 we fight against 95% of basic DDOS attacks.


== Performance ==
The result is most of load is at 50 000 requests per second.