Internet Explorer (IE) 7 and 8 Back Button Behavior for Post Method
Some of you may have experienced the strange behavior for some of the Websphere Portal, especially in the WCM related pages, that when you click the Browser (IE) BACK button, it throws “Webpage has expired” message
To me, it looks like this is IE 8 bug:
http://connect.microsoft.com/IE/feedback/details/381508/webpage-has-expired
So, when you encounter the similar problem, just leave it, or you can change the method from GET to POST.
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