parse "gopher://null.host:0/A\xffE\xc3\u007f\xd0U\xe4\xcer\xda\x16\x93\xac\xd4!w\x9b\xd9!gP\xc6|\xf7\x93&\xc5\xec\xf7dt\x16\xd2": net/url: invalid control character in URL