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[Ietf-message-headers] Re: Jabber-ID header field

Frank Ellermann <nobody@xyzzy.claranet.de> Thu, 14 September 2006 17:20 UTC

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From: Frank Ellermann <nobody@xyzzy.claranet.de>
Date: Thu, 14 Sep 2006 19:19:40 +0200
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Subject: [Ietf-message-headers] Re: Jabber-ID header field
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Graham Klyne wrote:
 
> why allow the obsolete folding-whitespace (obs-FWS)?

It's more like "inherited" than "allow", it's what you
get if you remove the "F" from ... [FWS] CRLF

Clearly nobody should fold trailing white-space before
the CRLF, that's a MUST NOT in 2822.  The FWS-syntax is:

| FWS =  ([*WSP CRLF] 1*WSP) /   ; Folding white space
|        obs-FWS

With that you inherit obs-FWS (MUST NOT generate etc.)
as soon as you say FWS.  If you then remove the bogus 
folding from ... [FWS] CRLF the rest is the same as
... [ 1*WSP / obs-FWS ] CRLF   

Where "obs" stands for MUST accept + MUST NOT generate.

Getting rid of it would work best in a future 2822bis,
until then obsolete gateways could try strange foldings.

For another attempt to nail this oddity see
<http://permalink.gmane.org/gmane.ietf.rfc.interest/110>
 
Frank



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