Is HTTP auth is the only way for WebDAV authentication?

As you know, Tomcat 4.0 includes WedDAV support. Now what I want to do is to extend/modify the class org.apache.catalina.servlets.WebdavServlet to build my WebDAV service which maps some kind of data source to WebDAV's hierarchical resource model. Especially the data source is a native XML

Is HTTP auth is the only way for WebDAV authentication?

As you know, Tomcat 4.0 includes WedDAV support. Now what I want to do is to extend/modify the class org.apache.catalina.servlets.WebdavServlet to build my WebDAV service which maps some kind of data source to WebDAV's hierarchical resource model. Especially the data source is a native XML

Can I do HTTP authenticaton in my servlet?

I am using Tomcat as the servlet container. What I want to do is write a servlet which do HTTP authentication without Tomcat's interacting. Is it possible? In detail, to enable HTTP authentication (basic realm), you should configure the web.xml in your webapp, and configure the