[xwiki-users] How to disable caching for attachments?

Hey all, We've been having browser caching problems for attachments where users have had to wait hours before their data would be updated in xwiki.For IE, for example, killing all instances of IE, restarting the browser, and then visiting the attachment is a solution to this problem. We basically need a way to add a Cache-Control header when the server responds to the attachment link. Is there a way to prevent caching of the URL for attachments in the web browser by changing the config files, or by changing something in the xwiki code? Thanks, Felix