You can set the expiration for a page using the pragma meta tag, but not
much else. Since the user is not connected to the web page once the page is
served until a new request or postback is made, a timeout in the strict
sense doesn't do much. Setting the expiration on the page through the pragma
meta tag does give the browser an idea of when to expire it from the cache,
or not to cache it at all, but that's about all you can do.
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