Re: [Sip] ABNF issue

[Rohan Mahy <rohan@cisco.com>]

Christer,

You specific question has been answered twice already, and I will 
answer it a third time.  If you still do not understand, please email 
one of the chairs privately and we will arrange for someone to explain 
it to you.



On Wednesday, December 11, 2002, at 06:21 AM, Christer Holmberg wrote:
> I never said that the CRLF is part of the header name. My question was 
> if the header name token could be proceeded by LWS, or
> the header name token always be at the beginning of a new line.
as rob@netrake said:
> 	RFC-3261 does not specifically ALLOW the name token to be proceeded 
> by LWS, i.e. the definition of message-header per ABNF is:
>
> 	message-header = (Accept / .... / extension-header) CRLF
>
> Therefore, the header name token MUST always be at the beginning of a 
> new line.
and as robert sparks said:
> The grammar answers that.
> extension-header starts with a token.
in other words, a SIP header ALWAYS starts with a token (all of the 
existing headers are tokens), which can NEVER contain leading 
whitespace.

thanks,
-rohan

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