[apps-discuss] apps-team review of draft-bryan-metalinkhttp-19 (fwd)

Yves Lafon <ylafon@w3.org> Fri, 28 January 2011 16:55 UTC

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Date: Fri, 28 Jan 2011 11:59:03 -0500
From: Yves Lafon <ylafon@w3.org>
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Subject: [apps-discuss] apps-team review of draft-bryan-metalinkhttp-19 (fwd)
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Baroula que barouleras, au tiéu toujou t'entourneras.


---------- Forwarded message ----------
Date: Fri, 28 Jan 2011 10:39:59 -0500 (EST)
From: Yves Lafon <ylafon@w3.org>
To: apps-review@ietf.org
Cc: Alexey Melnikov <alexey.melnikov@isode.com>, anthonybryan@gmail.com,
     neil@nabber.org, henrik@henriknordstrom.net, tatsuhiro.t@gmail.com,
     peter@poeml.de, alan.ford@roke.co.uk
Subject: apps-team review of draft-bryan-metalinkhttp-19

Dear authors,

I have been selected as the Applications Area Review Team reviewer for
this draft (for background on apps-review, please see

Document: draft-bryan-metalinkhttp-19
Title: Metalink/HTTP: Mirrors and Cryptographic Hashes in HTTP Header Fields
Reviewer: Yves Lafon
Review Date: 2011-01-28
IETF Last Call Date: 2011-02-18

Summary: This draft is almost ready for publication, but has a few small
editorial fixes, and possibly needs some minor clarifications.

Major Issues: None

Minor Issues:

In section 3,

[[Some organizations have many mirrors.  Only send a few mirrors, or
   only use the Link header fields if Want-Digest is used?]]
and add something along the lines of "As some organizations can have many 
mirrors, ..." in front of the next paragraph.

Also "network proximity" might be a decision choice for the set of mirrors
that might be returned.

In section 3.2
Did you consider exposing the ASN of the mirror network prefix would be a good 
option on top of Geographical Location? It is not uncommon to have better 
bandwidth between two countries than between two ISPs in the same country.

In section 6.
If Instance Digests are not provided by the Metalink servers, the Link header 
fields MUST be ignored.
Clarification about what needs ot be ignored:
"the Link header fields pertaining to this specification MUST be ignored"
to avoid any zealous reading of the text.

In section 7.
It might be good that if any Ranged requests generated after the first request 
ends up with a complete response and not a partial one (as servers might not 
support HTTP ranges) then all but the fastest connection must be closed. The 
other option would be to add a requirement in 2. that Metalink servers and 
mirrors MUST support HTTP Ranges (which would be a better way of solving the 

Also I noted a dependency on 'draft-ietf-ftpext2-hash' in the Normative 
References section.


In section 3. last paragraph and 7.1.1 6th paragraph, "fieldss" -> "fields"
In section 6. "Cryptographic Hashes of Whole Files",
               "Files" might be replaced by "Documents"

Thanks !

Baroula que barouleras, au tiéu toujou t'entourneras.