Richard Heyes wrote:
Maybe I'm being dense, but why not set it to what you want it to be?
Clearing it is leaving the decision up to the browser which will not
necessarily have the effect you want for all users.
Incidentally, it might not be possible if Apache is setting it. Not
sure if PHP has the ability to override headers being sent by Apache.
The two have different effects. The Expires: header proclaims that the
page is good for x hours/minutes/days etc. Whereas the browser can use
the Last-Modified header to figure the staleness for itself. If its
newer than the copy it has, it needs to download the newer copy.
I'm well-aware of what the headers are for, but you can construct expiry
headers that match the last-modified header. As I said I'm fairly
certain you will not be able in PHP to remove a header added by Apache.
Given that you can't get rid of it your best option is to set it to a
value that will minimise its effect.
Why can't you modify the Apache configuration to prevent it from adding
this header? If not in httpd.conf then in a .htaccess file. If your host
won't let you do that, switch to someone who will.
-Stut
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