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Re: [httpapi] Structured Fields for HTTP APIs

"Martin J. Dürst" <duerst@it.aoyama.ac.jp> Wed, 01 February 2023 04:46 UTC

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Date: Wed, 01 Feb 2023 13:46:28 +0900
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To: Julian Reschke <julian.reschke@gmx.de>, httpapi@ietf.org
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From: "Martin J. Dürst" <duerst@it.aoyama.ac.jp>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/httpapi/u2eaKIJOnJfyHJhsojQ2FS8daZI>
Subject: Re: [httpapi] Structured Fields for HTTP APIs
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Sorry to be late; some additional comments below.

On 2023-01-24 19:03, Julian Reschke wrote:
> On 23.01.2023 14:51, Darrel Miller wrote

>> The two contentious issues we have seen so far are:
>>
>>  1. Representing non-ascii characters.
> 
> Yes - I'm firmly on the side we should do this; but that discussion
> really needs to happen in the HTTP WG (which will take feedback from 
> here!).

> I don't think both issues have the same properties.

> Non-ASCII is way more complicated: depending on how you count, there are
> currently three different ways to do it proposed (binary,
> percent-escaping, RFC 8187), or even four (just don't; do not put
> human-readable strings into HTTP fields).
> 
> But here, for the three approaches you need out-of-band information to
> detect them. Generic tooling can't simply inspect the field value and
> decide "let's display this as string after unescaping/decoding" - at
> least not without heuristics.

There's additional information needed in most cases, namely what 
character encoding (charset) is being used. If we can nail that down to 
UTF-8 (and I haven't seen any other proposals), that's fine, but we need 
to be explicit.

Please also note that UTF-8 is relatively easy to detect with heuristics 
(see https://www.sw.it.aoyama.ac.jp/2012/pub/IUC11-UTF-8.pdf) But it 
would be much better to clearly separate actual binary data and text 
that includes non-ASCII.

Regards,   Martin.

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