Posted by NC on 12/20/05 04:47

4psite wrote:
>
> I am creating (using php) an html page with many links.
> Clicking on a link open the link as _self.
> Clicking on the browser back button brings the prv html page (with the
> links,) but instead of getting it from the cache it will recreate it.
> My questiosn, how to avoid the re-creation of the php/html page and
> just to reload it from the cache.

Send an "Expires:" header, perhaps? Something like this:

header('Expires: ' . date('r', time() + 3600));

This will tell the browser that the content it just received is going
to be valid for another hour (3,600 seconds), so it shouldn't bother
getting an updated version from the server. If you want a longer
period, just increase the number...

This said, note that almost any HTTP header is a suggestion, not an
order. There is nothing you can do to force a client to obey the
header, if it chooses not to...

Cheers,
NC

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