Re: #428 Accept-Language ordering for identical qvalues

"Eric J. Bowman" <eric@bisonsystems.net> Thu, 14 February 2013 01:40 UTC

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Date: Wed, 13 Feb 2013 18:38:22 -0700
From: "Eric J. Bowman" <eric@bisonsystems.net>
To: "Roy T. Fielding" <fielding@gbiv.com>
Cc: HTTP Working Group <ietf-http-wg@w3.org>
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Subject: Re: #428 Accept-Language ordering for identical qvalues
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"Roy T. Fielding" wrote:
>
> It has been a bad design trade-off ever since the very
> brief period in 1993-94 when folks didn't know which image format
> would be usable on all UAs and there was no CSS or javascript to allow
> for client-side adaptation.
> 

Well, that explains it!  That's when I got my start as a Web developer,
I think the rest of my career may be summed up as trying to un-learn
those bad habits...

>
> There are numerous ways to accomplish the same feature of HTTP
> content negotiation without the horrific bandwidth waste and
> privacy exposure of proactive negotiation. The caching impact of
> proactive negotiation is far worse than the one extra round trip
> per site for reactive negotiation, and even that round-trip isn't
> necessary in formats that support client-side adaptation.
> Defining protocol elements for reactive negotiation is one
> alternative. Encouraging the use of media types with inherent content
> selection/alternative abilities is another.
> Responsive design (or progressive refinement) is probably the most
> common example in practice today.
> 

OK, thanks for elaborating.

-Eric