From this question I understand, that the server should be already running by the time I make the test. Unfortunately, from the doc I've got the impression, that it's some kind of a clever test, that will start the server on it's own, will try to connect to it and will stop it afterwards (maybe it there's a point in doing that this way, because otherwise its not very useful -- it may be easier to browse to the web-page).
If I start the server manually, it works. Sorry for the wrong input.

Thanks,
Vsevolod