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I’m confused

HttpSession in JSP when using forward(Request, Response)

Something i'm not understanding. I have two JSP pages, index.jsp that submits to servlet A and result.jsp that gets the (request, response) through RequestDispatcher from servlet A. In servlet A, i get a session from HttpSession and set its attribute with a user name parameter i get from index.jsp.

When i test above application with Internet Explorer cookies disabled by writing this simple line of code in the result.jsp, the result.jsp page shows me the input from the index page? how so? shouldn't the output from the result.jsp page be null because cookies were disabled and i didn't use URL rewriting!!

I was experimenting with this yesterday and instead of forwarding the (request, response) to the JSP, I used the PrintWriter inside my servlet and the result.jsp showed null!?
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