out included directives to prevent caching along the way. Now we look
at the protocol (http vs https) and include directives that allow
(encourage) http pages to be cached for a short time. My reasoning is
that anything we spit out via http is documentation, and can grow a
bit stale. Sure, the menu on the left is dynamic, but not so dynanic
that it can't go a little stale too for people who are not logged in.