Hostnames fake & EntitiesID

[Cantor, Scott]

> 2- Is it possible to simply use localhost for both SP and IdP in the same
> machine and get them communicate?
> I mean using for example https://localhost/IDP for IDP entityID and
> https://localhost/ <https://localhost/IDP> SP for SP entityID in
> configurations.

You don't mean that at all. EntityIDs are not locations, they're names/labels. Identifiers. Whether something lives on the same machine or not is no reason to put localhost into an entityID.

-- Scott