HTTP Ogg Vorbis streams are playable as long as the Vorbis plug-in is installed & enabled (as it should be by default with WACUP). Have attached what I'm seeing with the Alt+3 dialog for the stream link above.
FLAC streaming is a whole different matter as it needs much more bandwidth & from what I remember is often wrapped in an OGG container & that's not something I've yet coded - the whole way I do streaming playback eventually needs to be changed as the mis-match between different plug-ins (mine & the few re-used from 5.666) just don't do what is needed with the modern web.
-dro