You need to enable the mod_headers extension: http://httpd.apache.org/docs/2.2/mod/mod_headers.html On a Debian system:

sudo a2enmod headers

Throw this into a .htaccess

Header set Expires "Thu, 19 Nov 1981 08:52:00 GM"
Header set Cache-Control "no-store, no-cache, must-revalidate, post-check=0, pre-check=0"
Header set Pragma "no-cache"
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