Updating RFC 5890-5893 (IDNA 2008) to Full Standard

Dave Thaler dthaler at microsoft.com
Thu Nov 15 21:12:31 CET 2012

> -----Original Message-----
> From: idna-update-bounces at alvestrand.no [mailto:idna-update-
> bounces at alvestrand.no] On Behalf Of Anne van Kesteren
> Sent: Thursday, November 8, 2012 1:06 AM
> To: Martin J. Dürst
> Cc: idna-update at alvestrand.no; John C Klensin; Simon Pieters; Andrew
> Sullivan
> Subject: Re: Updating RFC 5890-5893 (IDNA 2008) to Full Standard
> On Thu, Nov 8, 2012 at 6:45 AM, "Martin J. Dürst"
> <duerst at it.aoyama.ac.jp> wrote:
> > By chance, I found the reference that I was referring to again:
> > http://annevankesteren.nl/2012/09/idna2008
> I'm not sure what Internet Explorer does, but of the other browsers only
> Opera implements IDNA2008 (and does not do it per the recommendations
> of UTS #46, and is probably incompatible with deployed content and needs
> to change).

IE10 resolves http://www.ad--acta.de/ and you get to the page.

And when you put in http://faß.de the page you get to after resolution and
redirects is http://www.bayern-fass.de/cms/website.php 

> The main problem with IDNA2008 is that it makes a large corpus of domain
> strings effectively undefined, since it does not define pre-processing
> between e.g. finding an domain string in a page and applying the relevant
> algorithms and does not forbid such an algorithm either. In particular
> http://tools.ietf.org/html/rfc5891#section-5.2
> is very handwavy whereas IDNA2003 is perfectly clear.
> Overall, making backwards incompatible changes to domain string processing
> seems wildly inappropriate and I wonder why the IAB did not intervene. The
> rationale document cites "surprising" and "sensible"
> but I think we need something stronger to invalidate running code.
> (And if we don't, then the arguments I get about URI/IRI seem out of
> whack.)
> --
> http://annevankesteren.nl/
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