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I was naively using mapserv cgi to test WMS requests.
Only, after I lost quiet some time and with help of people from mailing list: http://lists.osgeo.org/pipermail/mapserver-users/2015-May/077860.html it turned out that WMS output prepends 3 extra lines indicating the mime-type (is this a bug or a feature?).
This pull request indicates one way to deal with this. Hope it helps also others.