twisted.web.resource.Resource.getChild(self, path, request)method documentation
Retrieve a 'child' resource from me.
Implement this to create dynamic resource generation -- resources which are always available may be registered with self.putChild().
This will not be called if the class-level variable 'isLeaf' is set in your subclass; instead, the 'postpath' attribute of the request will be left as a list of the remaining path elements.
For example, the URL /foo/bar/baz will normally be:
However, if the resource returned by 'bar' has isLeaf set to true, then the getChild call will never be made on it.
Parameters and return value have the same meaning and requirements as
those defined by