In 4.0- version each time the course page is loaded the file handlers
are calculate din the backend and injected directly into JS using a json
encapsulation. With this new webservice the handlers can be obtained
directly from the frontend when needed.
The course index is the first UI component that implements the new
drawers and the reactive components. The course index uses the course
state to present the current course structure and changes whenever
that structure change.
Simey Lameze