RE: parsing and comparing URIs

["McDonald, Ira" <imcdonald@sharplabs.com>]

Hi Phil, Andy, et al,

Fine - do no normalization, but expect breakage unless
you have very fine-grained control of your tools chain.

Comparing URIs is not just "somebody else's problem".

And PARSING URIs is just plain unwise and certainly
dangerous unless normalization is performed.

Cheers,
- Ira

Ira McDonald (Musician / Software Architect)
Chair - Linux Foundation Open Printing WG
Blue Roof Music / High North Inc
PO Box 221  Grand Marais, MI  49839
phone: +1-906-494-2434
email: imcdonald@sharplabs.com

-----Original Message-----
From: Phil Shafer [mailto:phil@juniper.net]
Sent: Friday, March 23, 2007 9:25 AM
To: McDonald, Ira
Cc: Andy Bierman; netconf
Subject: Re: parsing and comparing URIs 


"McDonald, Ira" writes:
>Actually, you can't safely compare URIs at all unless
>you subject them both to normalization and (as RFC
>3986 clearly says) a given protocol that depends on
>comparison of URIs must precisely specify the steps
>of normalization required for those comparisons.

It also says:

   Normalization of the base and target URIs prior to their comparison,
   as described in Sections 6.2.2 and 6.2.3, is allowed but rarely
   performed in practice.

Thanks,
 Phil

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