Tutorial - The default method
Request handler objects can implement a method called “default” that is called when no other suitable method/object could be found. Essentially, if CherryPy2 can’t find a matching request handler object for the given request URI, it will use the default method of the object located deepest on the URI path.
Using this mechanism you can easily simulate virtual URI structures by parsing the extra URI string, which you can access through cherrypy.request.virtualPath.
The application in this tutorial simulates an URI structure looking like /users/<username>. Since the <username> bit will not be found (as there are no matching methods), it is handled by the default method.