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Keeping parameters  RSS feed

Alexander Edwards
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I am trying to find a way to keep the parameters given to a page after redirecting to a login page and back.

Basically what I have is an e-mail being sent out saying you have a message and inside a link so the user can read it. the link looks something like http://www.domain.com/message.jsp?m=893487 but once they reach that page I have them redirected to a login page using response.sendRedirect("login.jsp?ret_url=message.jsp") then once they log in it redirects them back to the message page except now I no longer have the parameter "m=893487".

Is there any good way of storing parameters in cases like these or passing them along with the response.sendRedirect()?

Any help would be greatly appreciated!
It is sorta covered in the JavaRanch Style Guide.
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