Sindbad~EG File Manager
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching_FAQ
http://lxr.mozilla.org/mozilla-release/source/netwerk/protocol/http/nsHttpResponseHead.cpp#397
Unlike mozilla we limit this to 24-hr.
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Sindbad File Manager Version 1.0, Coded By Sindbad EG ~ The Terrorists