For a really good site that deals with the issues that you have, try Web Caching.
I would probably tell you to use the tools on that site to check if your cache control
headers are compliant... Some browsers, unfortunately, choose to ignore certain headers (as do some proxy servers).. so it may not be a content
but rather a browser issue...
One thing: I'm not sure if the Expires header is valid... see here for more details..
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