Hi I am using APC and with w3 cache I get:
<!-- W3 Total Cache: Page cache debug info:
Engine: apc
Cache key: 23d827e019380ab34e56a8ece7fe16ff
Caching: enabled
Status: not cached
Creation Time: 18.030s
Header info:
X-Powered-By: PHP/5.4.24
Set-Cookie: wfvt_3520576381=5300fed29f047; expires=Sun, 16-Feb-2014 18:39:22 GMT; path=/
Link: <http://www.page.eu/?p=7>; rel=shortlink
Last-Modified: Sun, 16 Feb 2014 18:09:40 GMT
Vary:
X-Pingback: http://www.page.eu/xmlrpc.php
Content-Type: text/html; charset=UTF-8
how to enable it?