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Re: What we call "headers"

"Roy T. Fielding" <fielding@gbiv.com> Tue, 17 March 2020 23:41 UTC

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From: "Roy T. Fielding" <fielding@gbiv.com>
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Date: Tue, 17 Mar 2020 16:37:20 -0700
In-Reply-To: <CF788613-EEE1-4321-BE98-780E7C77F607@mnot.net>
Cc: HTTP Working Group <ietf-http-wg@w3.org>, Julian Reschke <julian.reschke@greenbytes.de>
To: Mark Nottingham <mnot@mnot.net>
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Subject: Re: What we call "headers"
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> On Mar 16, 2020, at 11:38 PM, Mark Nottingham <mnot@mnot.net> wrote:
> 
> A little while back we made some changes in http-core regarding terminology and headers. This seems to have caused some confusion and comment, so I thought I'd summarise where I think we're at (Julian and Roy might want to chime in if they feel differently or want to add nuance). 
> 
> Note that this is _not_ a call to bikeshed the chosen terms*.
> 
> The corresponding spec text is at <https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#header.fields>, although of course we're still working on it.

It might be easier to see the changes vs 7231 in this diff

   https://httpwg.org/http-core/diffs/diff_semantics_frfc_to_07.html#part-9 <https://httpwg.org/http-core/diffs/diff_semantics_frfc_to_07.html#part-9>

One thing I noticed was that section 4 now says there are two separate areas
where fields can occur. I would prefer to define it as a possibly empty header
section and zero or more trailer sections (depending on the version or transfer
coding). I think it is better to provide for the general case instead of assuming
that chunked is the only example.  This is related to

  https://github.com/httpwg/http-core/issues/313

....Roy

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