RFC Errata
RFC 9110, "HTTP Semantics", June 2022
Source of RFC: httpbis (wit)See Also: RFC 9110 w/ inline errata
Errata ID: 7138
Status: Verified
Type: Technical
Publication Format(s) : TEXT, PDF, HTML
Reported By: Yousouf Taghzouti
Date Reported: 2022-09-23
Verifier Name: Francesca Palombini
Date Verified: 2022-11-09
Section 12.5.1 says:
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
It should say:
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:
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).