Re: [Technical Errata Reported] RFC7231 (6149)
"Roy T. Fielding" <fielding@gbiv.com> Wed, 29 April 2020 17:29 UTC
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From: "Roy T. Fielding" <fielding@gbiv.com>
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Date: Wed, 29 Apr 2020 10:26:18 -0700
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Cc: Julian Reschke <julian.reschke@greenbytes.de>, superuser@gmail.com, barryleiba@computer.org, Mark Nottingham <mnot@mnot.net>, Tommy Pauly <tpauly@apple.com>, eggyal@gmail.com, ietf-http-wg@w3.org
To: RFC Errata System <rfc-editor@rfc-editor.org>
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Subject: Re: [Technical Errata Reported] RFC7231 (6149)
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Reject. This is not an errata in RFC7231. While it is theoretically possible for media types to no longer define a given parameter, it is not possible for them to limit usage of parameters in HTTP. This example is still fine. Note that this example has already been updated in http-core's Accept https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#header.accept <https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#header.accept> ....Roy > On Apr 29, 2020, at 4:06 AM, RFC Errata System <rfc-editor@rfc-editor.org> wrote: > > The following errata report has been submitted for RFC7231, > "Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content". > > -------------------------------------- > You may review the report below and at: > https://www.rfc-editor.org/errata/eid6149 > > -------------------------------------- > Type: Technical > Reported by: Alan Egerton <eggyal@gmail.com> > > Section: 5.3.2 > > Original Text > ------------- > The media type quality factor associated with a given type is > determined by finding the media range with the highest precedence > that matches the type. For example, > > Accept: text/*;q=0.3, text/html;q=0.7, text/html;level=1, > text/html;level=2;q=0.4, */*;q=0.5 > > would cause the following values to be associated: > > +-------------------+---------------+ > | Media Type | Quality Value | > +-------------------+---------------+ > | text/html;level=1 | 1 | > | text/html | 0.7 | > | text/plain | 0.3 | > | image/jpeg | 0.5 | > | text/html;level=2 | 0.4 | > | text/html;level=3 | 0.7 | > +-------------------+---------------+ > > Corrected Text > -------------- > The media type quality factor associated with a given type is > determined by finding the media range with the highest precedence > that matches the type. For example, > > Accept: text/*;q=0.3, text/plain;q=0.7, text/plain;format=flowed, > text/plain;format=fixed;q=0.4, */*;q=0.5 > > would cause the following values to be associated: > > +--------------------------+---------------+ > | Media Type | Quality Value | > +--------------------------+---------------+ > | text/plain;format=flowed | 1 | > | text/plain | 0.7 | > | text/html | 0.3 | > | image/jpeg | 0.5 | > | text/plain;format=fixed | 0.4 | > | text/plain;delsp=yes | 0.7 | > +--------------------------+---------------+ > > Notes > ----- > The optional "level" parameter of media type text/html was removed by informational RFC 2854 (The 'text/html' Media Type), [section 2](https://tools.ietf.org/html/rfc2854#section-2) of which states: > >> Note that [HTML20] included an optional "level" parameter; in >> practice, this parameter was never used and has been removed from >> this specification. > > More formally, [the current IANA registration of the text/html media type](https://www.iana.org/assignments/media-types/text/html), which is taken directly from [section 16.1 of the HTML specification](https://html.spec.whatwg.org/multipage/iana.html#text/html), does not include a "level" parameter. > > Whilst the example is non-normative, it has given rise to misleading information—e.g. in the [MDN Web Docs glossary definition of "quality values"](https://developer.mozilla.org/en-US/docs/Glossary/quality_values), which states: > >> Some syntax, like the one of Accept, allow additional specifiers >> like text/html;level=1. These increase the specificity of the value. >> Their use is extremely rare. > > Instructions: > ------------- > This erratum is currently posted as "Reported". If necessary, please > use "Reply All" to discuss whether it should be verified or > rejected. When a decision is reached, the verifying party > can log in to change the status and edit the report, if necessary. > > -------------------------------------- > RFC7231 (draft-ietf-httpbis-p2-semantics-26) > -------------------------------------- > Title : Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content > Publication Date : June 2014 > Author(s) : R. Fielding, Ed., J. Reschke, Ed. > Category : PROPOSED STANDARD > Source : Hypertext Transfer Protocol Bis APP > Area : Applications > Stream : IETF > Verifying Party : IESG >
- [Technical Errata Reported] RFC7231 (6149) RFC Errata System
- Re: [Technical Errata Reported] RFC7231 (6149) Roy T. Fielding
- Re: [Technical Errata Reported] RFC7231 (6149) Julian Reschke