mixing mods

Note to self.

When setting up an apache mod_cache proxy make sure the backend is not using mod_deflate unless it show a huge performance gain with the deflation.  mod_deflate likes to pass a Varies header of agent so that in the cache you end up with a separate cached item for every user-agent that comes in and there’s a whole lot of browser/platform combinations out there ( in one case I see 300 different sets ).