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problem in getting the previous request in jsf

 
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in my case I have a screen on which a user can navigate through differrent ways(eg through differrent links on a menu etc. ).
The screen has a cancel link which when clicked the user should go to the previous page .
Now my problem is that the previous page can be any screen from where the user came. How do I get the previous request . Is there a way in jsf in which I can cache the previous request and invoke it when the cancel link is clicked...?
or if there any other suggesstions that you might have regarding tackiling this problem...
 
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