If you're using httpd you'd probably pair it with relayd. With relayd you can add custom headers, as this random example shows: https://github.com/reyk/httpd/

If you're using httpd you'd probably pair it with relayd. With relayd you can add custom headers, as this random example shows: https://github.com/reyk/httpd/wiki/Using-relayd-to-add-Cache-Control-headers-to-httpd-traffic https://github.com/reyk/httpd/wiki/Using-relayd-to-add-Cache... However that's probably not great still, because it's a global solution to a per-file problem.