The web interface from PiMusicBox:
http://www.woutervanwijk.nl/pimusicbox/
isn't accessible in Epiphany.

= wlp3s0 IPv4 MusicBox on MusicBox.local                    Web Site             local
   hostname = [MusicBox.local]
   address = [192.168.0.19]
   port = [80]
   txt = []

Neither by typing "musicbox.local", "musicbox.local.", or "MusicBox.local", or by accessing it through the "Nearby Sites" (which, when copying the address in the bookmarks dialogue resolved the address to an IPv6 one).

Note that Epiphany shouldn't resolve the IP address, so that a Web App could be created that always points to the service.