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Re: 6MAN WG Last Call: draft-ietf-6man-uri-zoneid-00.txt

Carsten Bormann <cabo@tzi.org> Mon, 05 March 2012 22:16 UTC

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Subject: Re: 6MAN WG Last Call: draft-ietf-6man-uri-zoneid-00.txt
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From: Carsten Bormann <cabo@tzi.org>
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Date: Mon, 05 Mar 2012 23:15:41 +0100
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This leaves me thoroughly confused.

While the text seems to indicate the contrary, the ABNF makes it clear that

coap://[fe80::a%25en1]/.well-known/core

is intended to indicate the zone ID of "25en1".

This is the only place in a URI where a percent is proposed to be used in stand-alone fashion -- everywhere else it occurs as part of pct-encoded.  For a good reason.

E.g., this works perfectly to talk to localhost in Safari and Chrome:
http://[%3a%3a1]/

Any other character but % (or []A-Fa-f0-9:] of course) would be less confusing for indicating zone-ids.  I'd recommend choosing one from sub-delims, such as * or &.

Grüße, Carsten

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