Biblio PHP-Rest is a basic substructure for PHP Rest services.
Session is an abstract class that should be the parent class of the main instance of the rest service. So the rest service project should define a CustomizedSession class and an instance that created from this class. Biblio recognizes every request-response lifetimes as a session.
A Session must have a RequestHandler and a ResponseBuilder.
RequestHandler is an abstract class either like Session. The rest service project must define a RequestHandler class too. By the way you must know api module files path to be able to redirect requests to related api methods.
ResponseBuilder is the class that defines the instance that Session must have one and Session can send responses via this instance.
P.S.: You can see the relation of these 3 classes in the visual structure