Bulletproof POST remove

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Hi all

I noticed some sites are able to remove POST data 100% of the time.  Even if 
the user presses the back button there is no more POST data pressent.

I would like to achieve the same thing and currently I use a location header 
to transfer the user to the same page.

Like

check post
 do action
header('Location: $thispage');
die();

But then when the user presses the back button they can still retransmit the 
action.

I tried playing with the MUST-REVALIDATE, pragma-nocache header and stuff but 
it doesn't seem to work.  Also I notice that on some sites, when I press the 
back button, there is a white page that sais "Your session has expired".  

It should be noticed that I do not use sessions.

It should be like POST-once, after that there should be no more remnants of 
it.


With kind regards

Andy


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