voir la source 

Divers moyens de supprimer qu'une page soit mise en cache
ou indexée

<meta name="robots" content="NoIndex,NoFollow">

<meta http-equiv="Pragma" content="no-cache">

<META HTTP-EQUIV="Expires" CONTENT="Tue, Nov 20 2001 09:00:00 GMT">




IMPORTANT NOTE: AOL's proxy system does not read HTML. 
Use of the META HTTP-EQUIV tags in the content of web pages 
(in either HEAD or BODY) does not control the behavior of AOL's proxy caches. 

Utiliser : 
Cache-Control: no-store
This object may not be stored in any cache, even the requestor's browser cache.


Cache-Control: no-cache
This object may be held in any cache but it must be revalidated every time it is requested.





En php headers : 

<?php
header("Content-type: text/html"); 
header("Expires: Tue, Nov 20 2001 09:00:00 GMT"); 
header("Last-Modified: " . gmdate("Tue, 20 Nov 2001 09:00:00") . " GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
?>