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Implementing cancel for long running web reuests

Nikhil agarwal
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Flow of control :
User submits a form in portlet
At backend a database search operation is intiated.
As intial response ,canel button is presented to user.
if users cancels the search then it is redirected to previous page.
else after completion of search result page is rendered.

Can anybody suggest how to implement it in portlets.
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