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RFC 7240, "Prefer Header for HTTP", June 2014

Note: This RFC has been updated by RFC 8144

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app
See Also: RFC 7240 w/ inline errata

Errata ID: 4439
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Martin Thomson
Date Reported: 2015-08-09
Verifier Name: Barry Leiba
Date Verified: 2016-02-23

Section 2 says: 

     preference = token [ BWS "=" BWS word ]
                  *( OWS ";" [ OWS parameter ] )
     parameter  = token [ BWS "=" BWS word ]

It should say:

     preference = preference-parameter *( OWS ";" [ OWS
                  preference-parameter ] )
     preference-parameter = parameter / token

Notes:

Section 1.1 incorrectly states that "word" is defined in RFC 7230. It is not. Therefore, the syntax is completely under-specified.

The "parameter" rule, as defined in RFC 7231, is used in lots of other header field definitions successfully. The only drawback is that "parameter" doesn't permit the use of "OWS" either side of the "=" character.

This change would also require changes to Section 1.1.

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