Re: [Ietf-message-headers] [W3C BPWG] HTTP header fields X-* and normal ones / request for advice

SM <sm@resistor.net> Tue, 27 January 2009 22:40 UTC

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Date: Tue, 27 Jan 2009 14:40:01 -0800
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From: SM <sm@resistor.net>
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Subject: Re: [Ietf-message-headers] [W3C BPWG] HTTP header fields X-* and normal ones / request for advice
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At 06:11 26-01-2009, eduardo.casais@areppim.com wrote:
>3) QUESTIONS.
>
>We would be grateful to get advice from the IETF with respect to handling
>the
>coexistence of X- and non-X- prefixed fields, and the phasing out of
>deprecated
>fields.
>
>3.a: What is the IETF policy regarding the registration of X- prefixed
>fields?

The following is personal opinion and not advice about IETF policy 
.  Refer to BCP 90 for the registration procedures.

>3.b: What is the IETF policy regarding the promotion of X- prefixed header
>fields (registered or not) to non-X-prefixed, standard registered ones?

X- prefixed header fields are generally not registered.  For the 
example you mentioned, the header field was registered with 
"depreciated" as the status.

>3.c: What is the IETF policy regarding the simultaneous deployment and
>utilization of two sets of header fields, which have the same semantics, one
>
>comprising X- prefixed and the other equivalent non-prefixed fields?

You can depreciate the existing one in favor of the one defined in your RFC.

>3.d: What is the IETF policy regarding the deprecation and discontinuance of
>
>HTTP header fields?

See Section 4.5 of BCP 90 about Change Control.  RFC 4229 defines the 
initial contents of a permanent IANA registry for HTTP header fields.

Regards,
-sm

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