[SIPForum-discussion] Does anybody familar with what empty Accept-Language means?

[Tomasz Zieleniewski]

Hi,

In HTTP if an Accept-Language header is present, then all languages which
are assigned a quality factor greater than 0 are acceptable.
>From specification it is one non-empty list of "language-range"'s. There is
a special range "*" which represent everything which wasn't matched by
ranges.
SIP defines Accept-Language as: "Accept-Language:" + optional sequence. This
is not consistent with HTTP specification.

Accept-Language  =  "Accept-Language" HCOLON
                     [ language *(COMMA language) ]
language         =  language-range *(SEMI accept-param)
language-range   =  ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) / "*" )


So trying to applie rules from RFC 2616 with SIP definition I would say that
if the header value is empty and there is no special range "*" present
(everything which wasn't matched by ranges)
then this means that no language is acceptable.

Kind regards,
- Tomasz Zieleniewski

2009/5/8 ZHANG Joey <yongz at alcatel-lucent.com>

>  Hi,
>
>
>
> I encounter one issue about the syntax of Accept-Language, seems that
> RFC3261 is inconsistent with RFC2616.  From revision of HTTP spec (see
> http://www.ietf.org/internet-drafts/draft-ietf-httpbis-p3-payload-06.txt),
> Accept-Language can’t be empty. But from RFC 3261 ABNF, Accept-Language can
> be empty since the field value is optional.
>
>
>
> Can anybody tell me should the Accept-Language be empty?  And what does
> empty Accept-Language means?
>
>
>
>
>
> Thanks,
>
>
>
> Joey Zhang
>
>
>
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