Session for a client server without database

Hi everyone,

I'm building a client server for consume a API that manage all the users
information and return it to the clients, in my case (rails client) I’m
wondering what is the best approach to manage the users session for my
application.

The client uses ActiveResource to get the data from the API and for the
moment I don't have any DB yet and now I need to create the sessions for
the users so they have the token the API returns and they can stay
logged.

I need some suggestions of which is the best way to do this.