Hello guys! I'm using squid as a reverse-proxy. And I can't understand how squid decides when to check for fresh version of file from origin server. It looks like for some documents it sends 'If-Modified-Since' or similar headers and if it gets 304, it serves file from cache. And for some documents it doesn't check for fresh version and always serves from cache. I was testing that with curl without any additional headers. Can some explain how that works or where I can read about that in detail? And is it possible to make squid always check for fresh version before serving from cache? Thanks! Alexander
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