Standardizing on IDNA 2003 in the URL Standard

Anne van Kesteren annevk at
Thu Aug 22 14:36:56 CEST 2013

On Thu, Aug 22, 2013 at 1:28 PM, Gervase Markham <gerv at> wrote:
> You mean with regard to UseSTD3ASCIIRules? Happy to change my proposal
> in that regard. See the bug.

With regards to all the things that would be different, including
treatment of e.g. ß. We should provide a consistent platform to the
world, not one that keeps changing under your feet. And the
compatibility that is important here is not compatibility with
IDNA2003 per se, but with DNS as deployed and support for it in

As far as UseSTD3ASCIIRules is concerned, I haven't checked if TR46 is
safe when it comes to if you turn that
flag off. We want "_" in the output, but never "/" (should just fail).
(Currently we have "/" in the output, but that causes downstream
security bugs due to parsing the serialization yielding different


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