[Required] Class: org.zkoss.zk.ui.http.DHtmlLayoutServlet

DHtmlLayoutServlet is a servlet used to load ZUML pages when the Web server receives URL requests sent by users.

Notice that you must specify load-on-startup since many other servlets depend on the ZK loader.

<load-on-startup>1</load-on-startup>

It is suggested to map this servlet to the zul and zhtml extensions as shown in the Sample section below. It is OK if you want to map xul and html, too.