Why setting Cache-control does not work

I'm using the thinkphp framework I want to back up a page when you click the browser's Back button when the back page reloads instead of reading the cache I added the header ("Cache-control:no-cache") to the Controller method on this page. Must-revalidate "); But Cache_control doesn't work.

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I'm using the thinkphp framework I want to back up a page when you click the browser's Back button when the back page reloads instead of reading the cache I added the header ("Cache-control:no-cache") to the Controller method on this page. Must-revalidate "); But Cache_control doesn't work.

I am using the thinkphp frame TP box Cache_control default is private so I set in the controller does not work I changed the configuration file on it.

header("Cache-Control: no-store, no-cache, must-revalidate");header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); //过去的时间

See Bird Brother This article: http://www.laruence.com/2010/03/05/1332.html, for the refresh, F5, backward is not the same, you really do use the cache, rather than re-download

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