Re: Re: preventing "back" button usage?

On Tuesday, April 2, 2002, at 09:15 AM, Rick Emery wrote:

use cache control in your HTML to prevent BACK button usage This is easily done

I've tried this using the HTTP headers recommended on the header() man page, such as header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); header("Pragma: no-cache"); These don't seem to have the effect that I'm looking for. Someone else on the list suggested storing a session variable that basically says "this page has been filled out, do not do anything if it has been resubmit" which is a good idea, but I was hoping to have the user automatically re-routed to an error page if they hit the "back" button. (The session variable idea won't work until they refresh a page or submit a form, because they will be returning to a page in their history.) Erik ---- Erik Price Web Developer Temp Media Lab, H.H. Brown pricee@hhbrown.com