Story:
https://processwire.com/talk/topic/9250-what-should-i-do-to-make-pw-to-work-with-a-reverse-proxy-cache/
After a few days of reading documentation, I got processwire to work with nginx reverse proxy cache. This is not a tutorial on how to install server software. A working nginx config copy will be posted on next reply.
Ubuntu 14.04.1 x64
Nginx 1.4.6
apache 2.4.7
mysql 5.6.19
php 5.6.6 (php5-fpm)
A new copy of content will be fetched instantly.
A screencast of this demo