Basic HTTP Authentifaction width TOMCAT

[Eric MERY]

Hello,
I want to use HTTP authentification with TOMCAT (I work in xmlrpc with
PHP). 
I've read the web page
http://wiki.apache.org/xindice/BasicAuthentication explaining the
mechanism with Jetty BUT I don't understand how to Configure the Xindice
XML-RPC Driver ? Which file should I modify ?
If you have tested basic authentification with Tomcat, can you please
help me ?
Thank you.
Eric