[Technical Errata Reported] RFC7231 (6149)
RFC Errata System <rfc-editor@rfc-editor.org> Wed, 29 April 2020 11:10 UTC
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Subject: [Technical Errata Reported] RFC7231 (6149)
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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