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Re: Using HTTP Trailers [was: Content-Integrity header]

From: Amos Jeffries <squid3@treenet.co.nz>
Date: Thu, 12 Jul 2012 14:27:08 +1200
To: <ietf-http-wg@w3.org>
Message-ID: <5ea0a4aa9c30ace3cbfb02354fe8e9a2@treenet.co.nz>
On 12.07.2012 13:43, Zhong Yu wrote:
> Intermediaries are required to decompress a gzip transfer-coding?

Yes. Transfer Encoding must be removed when caching, when transforming, 
when interpreting the body, or when transcoding to a hop with different 
negotiated Transfer-Encoding type.

There is a very limited set of middleware (essentially just SOCKS or 
VPN tunnels) which can avoid it. All the rest have to implement the 

> Intermediaries are forbidden to decompress gzip content-coding to 
> look
> into the content? Intermediaries are forbidden to change
> Accept-Encoding and Content-Encoding?

Why do you insert this word "are forbidden to"?

It is a *performance* loss issue, not a permission one, for the large 
majority of intermediary types which do not need to touch the entity 
integrity in any way. Just look at how many of the transforming proxies 
that do content filtering find it necessary to force identity encoding 
from servers just to operate at any reasonable speed.

Received on Thursday, 12 July 2012 02:27:33 UTC

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