How to make servlet target to the caller page?

If page A and B both can call a servlet, how do I make the servlet be able to return to caller page after it's work?
i have this code:
String target = "/index.jsp";
RequestDispatcher rd;
rd = getServletContext().getRequestDispatcher(target);
rd.forward(req,res);
How do I get caller page and forward back?
thanks

create a parameter in the calling page with <input type='hidden' name='callingPage' value='page_name'> and pass this to your servlet. then your servlet would know which page was the one that called it.
String target = "/" + request.getParameter("callingPage");
RequestDispatcher rd;
rd = getServletContext().getRequestDispatcher(target);
rd.forward(req,res);

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