The jsp:param Element
Some of the standard actions allow jsp:param elements in their body. jsp:forward is a case in hand.
We could replace our static “missing parameter” error page, noparam.html, with a JSP page that itself takes a parameter, specifying which parameter was missing from the original request.
The jsp:forward element would be replaced with:
<jsp:forward page=“noparam.jsp”>
<jsp:param name=“missing” value=“who” />
</jsp:forward>