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Problēma ar cache-control un expires

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Tātad, problēma sekojoša, ir nodefinēti šādi php headeri:

header("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
header("Content-type: text/html; charset=utf-8");
header("Expires: Thu, 19 Nov 1981 08:52:00 GMT");
header("Pragma: no-cache");

bet browseri turpina cachot.

Lūk ko parāda Google Chrome Developer Tool:


Cache-Control:public, max-age=10800



Content-Type:text/html; charset=utf-8

Date:Wed, 25 Nov 2009 19:08:06 GMT

Expires:Wed, 25 Nov 2009 22:08:06 GMT

Keep-Alive:timeout=5, max=100

Last-Modified:Tue, 03 Nov 2009 16:07:19 GMT


Server:Apache/2.2.8 (Win32) PHP/5.2.6



Kāpēc atšķiras cache-control un expires? Lūdzu palīdziet.

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