Difference between encodeURL and encodeRedirectURL

Question

The javadoc for javax.servlet.http.HttpServletResponse is a little vague on the difference between what rules encodeURL and encodeRedirectURL

Answer 1

encodeURL() is used for all URLs in a servlet's output. It helps session ids to be encoded with the URL.

encodeRedirectURL() is used with res.sendRedirect only. It is also used for encoding session ids with URL but only while redirecting.