Currently, when eZ Publish is configured in cluster mode, images sent by index_cluster.php have an Expires header set to current date + 100 minutes (even if a comment in index_image_*.php says that it is set to 10 minutes...)

It would be nice if this offset can be configured in index_cluster.php with a constant. Btw, the default value should/could also be increased because 100 minutes is quite low and as said on the list [1] each time an image is changed, its URL changes too so there's no possible client/reverse proxy side cache issue.

[1] http://lists.ez.no/pipermail/sdk-public/2009-December/002877.html