[PHP] caching question

[Jean-Christian IMbeault]

I am using Apache 1.3.27 and PHP 4.3.3.RC1 and someone has told me that 
my web page cannot be cached but I cannot figure out why. My friend 
tells me my pages all keep sending this in their headers:

Cache-Control: post-check=0, must-revalidate, no-store, no-cache, 
pre-check=0

But I can't figure out why the headers are set like this. I am not 
setting any headers so I am wondering if it is a setting in my web 
server, php.ini file or some other php scripts I have running in the 
background.

Also print_r($HTTP_SERVER_VARS) gives one server variable to be:

[HTTP_CACHE_CONTROL] => max-age=0

What does this variable mean and where was it set?

Any and all help appreciated!

Jean-Christian Imbeault

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