Announce: New http cache plugin

[eva2000 (George)]

@nicolasazrak

@kekub cache is not really useful with static content, because to serve content it’s pretty similar. It might be a little bit faster because it keeps the file descriptor open but the difference is not big. Although it works (because it is independent from where the data came), it is more useful when you have slow responses, for example: the ones that come from an app server with a slower language.

re-visited http.cache with source built Caddy 0.10.9 and http.cache proxy caching still helps for index.html h2load HTTP/2 HTTPS testing though still slower than non-cached Nginx results https://community.centminmod.com/threads/caddy-http-2-server-benchmarks-part-2.12873/#post-54715

Tested Caddy source build with GCC 4.8.5 and GCC 7.1.1 on CentOS 7.4 on 2 cpu OpenVZ 2GB RAM/50GB SSD VPS.