Re: [apps-discuss] Slash and version number in Authentication-results: header field

[Alexey Melnikov <[e-mail]>]

On 20/05/2013 08:14, S Moonesamy wrote:
> Hi Alexey,
>
> Scott Kitterman mentioned [1] that the following:
>
>   authres-header = "Authentication-Results:" [CFWS] authserv-id
>     [ [CFWS] "/" [CFWS] authres-version ]
>
>  'is an incompatible change and if you really want to make it, you should
>   bump the version number.  I checked and with authres, your example is
>   mis-parsed.
>
>     Authentication-Results: example.org/1; none
>
>   In this example, the authserv-id is "example.org", but authres, 
> using the
>   RFC 5451 ABNF parses this and determines the authserv-id is 
> "example.org/1"'
>
> Murray Kucherawy commented that he has "yet to see a single 
> implementation that includes a version number in its output, though 
> there are some that do look for it" [2].  John Levine responded that 
> his implementation does [3].  He also mentioned that the introduction 
> of the slash (see ABNF) creates an incompatibility.
>
> There is also the following in Section 5 of 
> draft-ietf-appsawg-rfc5451bis-02:
>
>   "An MTA SHOULD remove any instance of this header field bearing a
>    version (express or implied) that it does not support."
>
> Will the addition of the slash cause an interoperability issue?

It looks like it might. I haven't implemented the spec yet (although I 
intend to), so this would not affect my [yet-to-be-written] implementation.

> Regards,
> S. Moonesamy
>
> 1. 
> http://www.ietf.org/mail-archive/web/apps-discuss/current/msg09460.html
> 2. 
> http://www.ietf.org/mail-archive/web/apps-discuss/current/msg09463.html
> 3. 
> http://www.ietf.org/mail-archive/web/apps-discuss/current/msg09465.html
>