# note: drupal's botstrap.inc does: header("Expires: Sun, 19 Nov 1978 05:00:00 GMT");
# so forget about optimizing php content
ExpiresActive On
-<FilesMatch "\.(css|js|png)$">
+<FilesMatch "\.(css|js|png|gif|jpg)$">
ExpiresDefault "access plus 12 hours"
</FilesMatch>