This url is redirecting to a webpage instead of providing a valid audio stream, hence the “<!DO” when trying to read the first chunk of data but getting “<!DOCTYPE HTML>”. The Ogg and MIDI errors are just a result of the fallback behaviour of trial and error attempts at finding the correct format.
The reason for the redirect is because we do not currently support https. There is a task to implement https/SSL support for net streams in a future release.