how to expire a page

e.g. sales confirmation page

[jamie]

hi,

every successful purchase in our shop will display a voucher which the customer can print out and exchange for goods.

the voucher is only displayed if payment has been correctly made, so there is no chance of someone accessing this page by mistake.

however, is there a way to stop the voucher re-appearing if someone clicks away and then back to the page? so we can put a message "please print this page before you click away", (and that if they do click away the page is lost forever)

(we will of course be mailing them the same voucher)

many thanks

[Timotheos]

Have you played around with disabling caching either with the meta tags or headers?
Refer to this article at sitepoint: [sitepoint.com...]

[jamie]

hi timotheos,

thanks for link. not exactly what i was looking for, but interesting reading.

i have tried adding the expires headers, etc, but AFAIK, just clicking back and forth with the forward and back buttons, it is impossible to stop the page from being seen again.

but it doesn't matter in the case above, as my confirmation page can only be accessed by a successful POST'ed order.