For completeness, here is a log to show that Rhythmbox does indeed make a HEAD
request:
HEAD /ueberklang/ueber220608.mp3 HTTP/1.1
Host: listening.at:8000
User-Agent: gnome-vfs/2.22.0 neon/0.25.4
Keep-Alive:
Connection: TE, Keep-Alive
TE: trailers
HTTP/1.0 400 Bad Request
Content-Type: text/html
<b>unknown request</b>
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Rhythmbox cannot download some podcasts (port 8000)
https://bugs.launchpad.net/bugs/247123
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