This plugin lets you stream music files to your mpd that are not in your
database.
Mserver is compiled using the libmicrohttp library, which enables applications
to function as a minimal webserver. As MPD is perfectly capable of playing
Streams out of the box, you get a list of streams in your playback queue after
adding the files.

WWW: http://gmpc.wikia.com/wiki/GMPC_PLUGIN_MSERVER