We have a squid cache in accelerator mode which is working nicely. When we implemented this we also implemented conditional GET support (with If-Modified-Since:) in performance-critical parts of our site, so that for certain performance-critical requests squid could do a fast internal conditional-GET and then serve the cached copy of a resource. This has had the side-effect of allowing browsers to make If-Modified-Since: requests to the accelerator, which then passes them through and possibly returns a 304 to the client itself, rather than just internally. Unfortunately, it turns out that If-Modified-Since: support is broken in Mozilla when a Vary: header is sent[1]. Therefore, though the site now works fine for non-conditional requests, it behaves inconsistently for the large part of the audience who have this broken client. Therefore (and while we'd like to save the bandwidth...) we need to have squid treat conditional GETs as non-conditional; but obviously we still need to use conditional GETs internally (otherwise we'd lose the performance gain of using squid in the first place). Is there a simple way to do this, or do I need to patch squid? --- 1. see https://bugzilla.mozilla.org/show_bug.cgi?id=269303 -- Don't look back. The lemmings might be gaining on you.
