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What could be the difference between if-modified-since and if-none-match? I have a feeling that if-none-match is used for files whereas if-modified-since is used for pages?
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Timestamp value used in Last-Modified/If-Modified-Since has limited precision - one second and that is simply not enough for fast changing content like, for instance, Web-chat application where more than one message could be posted at any given second. ETag/If-None-Match can help to solve that problem.