[undertow-dev] HTTP/2 REST API

Hi, I would like to understand how to make a REST API with RestEasy and Undertow be served with HTTP/2 or SPDY. How have I to configure Undertow? I have a frontend application running on Undertow calling this REST API on another Undertow instance. How can I configure both to use HTTP/2? Does all this "optimization" make sense? Thanks everybody -- Davide