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How can I use a Servlet Filter to change an incoming URL from http://nm-java.appspot.com/Check_License/Dir_My_App/Dir_ABC/My_Obj_123 to http://nm-java.appspot.com/Check_License?Contact_Id=My_Obj_123 ? Update : according to BalusC's steps below, I came up with the following code: public class UrlRewriteFilter implements Filter { @Override public void init(FilterConfig config) throws ServletException { // } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws ServletException, IOException { HttpServletRequest request = (HttpServletRequest) req; String requestURI = request.getRequestURI(); if (requestURI.startsWith("/Check_License/Dir_My_App/")) { String toReplace = requestURI.substring(requestURI.indexOf("/Dir_My_App"), requestURI.lastIndexOf("/") + 1); String newURI = requestURI.replace(toReplace, "?Contact_Id="); req.getRequestDispatcher(newURI).forward(req, res); } else { chain.doFilter(req, res); } } @Override public void destroy() { // } } The relevant entry in web.xml look like this: <filter> <filter-name>urlRewriteFilter</filter-name> <filter-class>com.example.UrlRewriteFilter</filter-class> </filter> <filter-mapping> <filter-name>urlRewriteFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> I tried both server-side and client-side redirect with the expected results. It worked, thanks BalusC!

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