I've recently started sorting out the static content on our sites and adding Expires headers to it.
My question is, when it comes to the stuff in our GeoWebCache, is it worth adding expires headers to these? The particular areas I was thinking of was our Aerial Photography and Historic Maps, which will never, ever change. Will adding Expires headers result in some of this content actually being cached on the users browser or will it make no difference at all.
I was thinking that because of the amount of imagery (256x256 JPEG tiles) there would be little benefit to expires headers, as the browser would not cache it all, and might even start discarding the 'proper' static content (Icons, Backgrounds etc.) resulting in more requests to the server for this content, which is not ideal as I would rather this content stayed with the client.
I hope this makes some sort of sense, I am brand new to this idea of Expires Headers and thought it was something my predecessors would have included but evidentally not! Any advice is much appreciated, just check out that accept rate ;-)