Most of those tools don't like IRI like: http://müller.de/ http://müller.de/ or the most famous http://☃.net http://☃.net (http://xn--n3h.net/ http://xn--n3h.ne

Most of those tools don't like IRI like: http://müller.de/ http://müller.de/ or the most famous http://☃.net http://☃.net (http://xn--n3h.net/ http://xn--n3h.net/) and that's a shame! Just like many URL shorteners… For example, Django do it wrong (even though I tried: https://code.djangoproject.com/ticket/11522 https://code.djangoproject.com/ticket/11522): >>> print(django.VERSION) (1, 3, 1, 'final', 0) >>> print(django.http.HttpResponseRedirect(u"http://müller.de)) Content-Type: text/html; charset=utf-8 Location: http://m%C3%BCller.de While werkzeug is good! >>> print(werkzeug.__version__) 0.8.1 >>> werkzeug.redirect(u"http://müller.de).headers Headers([('Content-Type', 'text/html; charset=utf-8'), ('Content-Length', '247'), ('Location', 'http://xn--mller-kva.de)]