The purpose of ResourceAPI

[CelestialArcadia]

Hello!

I didn't know how else I would reach you, but I have been trying to wrap my head around the "ResourceAPI" purpose,
and it's still not clear to me.

1. When the angular app trying to communicate with the backend, why not just do so directly with the AuthServer.
2. And in case I wanted my angular app to communicate with the backend, then the URI should include the "API/controller" in the "ValuesController" class then add - say the "register" URI? it's still confusing, and especially how it ( the resource API ) redirects to "AuthSever".
3. is it playing like some sort of a gateway? if so, should I configure it if I had to add some logic? - To be more specific in what situation(s) the resourceAPI will serve me.