Bug in validator

Hello,

The validator fails to fetch any file hosted on a domain that contains any character valid in Unicode 8.0 or newer.

Thus, http://xn--9s9h.ws (FOX FACE emoji, added in Unicode 9.0) fails with "Invalid host: An ACE label does not contain a valid label string.", while https://xn--6o8h.ga/ (DRAGON FACE emoji, added in Unicode 7.0) works.

Both are valid according to IDNA2003 (which still is in use by .ws, .tk and .ga amongst others), so I suppose the error would be that you may be using an old version of ICU4J that does not properly validate newer characters.

Marcos