[Errata Verified] RFC9110 (7138)

[RFC Errata System <[e-mail]>]

The following errata report has been verified for RFC9110,
"HTTP Semantics". 

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid7138

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Status: Verified
Type: Technical

Reported by: Yousouf Taghzouti <[e-mail]>
Date Reported: 2022-09-23
Verified by: Francesca Palombini (IESG)

Section: 12.5.1

Original Text
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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:

Table 5: 

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/html;level=3	             0.7

Corrected Text
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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:

Table 5: 

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/html;level=3	             0.3

Notes
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To illustrate how the media type quality factor associated with a given type is determined, the following example is given: 

Accept: text/*;q=0.3, text/plain;q=0.7, text/plain;format=flowed, text/plain;format=fixed;q=0.4, */*;q=0.5

The last row of the result table (table 5) presenting the values to be associated cannot be deduced (MediaType: text/html;level=3, Quality Value: 0.7), since only "text/*;q=0.3" and "*/*;q=0.5" are possible values and as explained in the RFC "text/*;q=0.3" should take precedence. 

In section 5.3.2 of RFC7231, a similar example is given, where the last row of the table is correct (text/html;level=3 | 0.7) since in that example the accept header contains (text/html;q=0.7).

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RFC9110 (draft-ietf-httpbis-semantics-19)
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Title               : HTTP Semantics
Publication Date    : June 2022
Author(s)           : R. Fielding, Ed., M. Nottingham, Ed., J. Reschke, Ed.
Category            : INTERNET STANDARD
Source              : HTTP
Area                : Applications and Real-Time
Stream              : IETF
Verifying Party     : IESG