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Re: SVG12: Transfer-Encoding

From: Yves Lafon <ylafon@w3.org>
Date: Tue, 11 Oct 2005 15:51:20 +0200 (MEST)
To: Chris Lilley <chris@w3.org>
cc: Boris Zbarsky <bzbarsky@mit.edu>, Bjoern Hoehrmann <derhoermi@gmx.net>, www-svg@w3.org
Message-ID: <Pine.GSO.4.63.0510111537440.804@gnenaghyn.vaevn.se>

On Tue, 11 Oct 2005, Chris Lilley wrote:

> Do I have the wrong registry, or is HTTP/1.1 inconsistent wrt the IANA
> registry, using terms it claims are registered but in fact are not?
>
> Looking at http://www.iana.org/numbers.html I don't see any other
> applicable registry.
>
> The HTTP/1.1 references
> http://www.w3.org/Protocols/rfc2616/rfc2616-sec17.html#sec17
> does not list a registry of Transfer-Encoding tokens either.

wrt Transfer-Encoding, they are defined in section 3.6 of RFC2616

<<<
    The Internet Assigned Numbers Authority (IANA) acts as a registry for
    transfer-coding value tokens. Initially, the registry contains the
    following tokens: "chunked" (section 3.6.1), "identity" (section
    3.6.2), "gzip" (section 3.5), "compress" (section 3.5), and "deflate"
    (section 3.5).
>>>

However I did not find any IANA registry containing all those tokens...

digging a bit (down to [1]), I think that the spec is correct as it talks 
only about the data (entity in the HTTP world) TE/Transfer-Encoding deals 
with the message level and is completely hidden from a data presentation 
layer.
Also Transfer-Encoding is only hop-by-hop while Content-Encoding is end-to 
end, meaning that a proxy can add or remove or keep (remove then add) a 
Transfer-Encoding.

As a side note, the use Transfer-Encoding is very useful for proxies 
between a high-speed link and a slow link, but only a few UA implements 
it. A bit like Content-Location which is almost mandatory when you want to 
do serious editing, and that almost only a few UA care about...
Thanks,

[1] http://lists.w3.org/Archives/Public/www-svg/2005Apr/0239.html

-- 
Yves Lafon - W3C
"Baroula que barouleras, au tiéu toujou t'entourneras."
Received on Tuesday, 11 October 2005 13:52:03 GMT

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