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Re: Origin header format

From: Anne van Kesteren <annevk@opera.com>
Date: Fri, 02 Oct 2009 14:47:15 +0200
To: "Julian Reschke" <julian.reschke@gmx.de>
Cc: "Adam Barth" <abarth@cs.stanford.edu>, www-archive@w3.org
Message-ID: <op.u06a41f764w2qv@annevk-t60>
On Fri, 02 Oct 2009 14:42:29 +0200, Julian Reschke <julian.reschke@gmx.de>  
> Anne van Kesteren wrote:
>> So I just read some things again and it seems CORS is already using  
>> comma-separated lists for some header formats. My thinking now is that  
>> we should just do the same for the Origin header. I think that would  
>> make it (per modified (future) ABNF rules from httpbis):
>>   origin       = "Origin" ":" origin-value
>>  origin-value = "null" / #serialized-origin
>>  Apparently the OWS issue will be solved by future drafts of httpbis.
> The #list rule should be used as a top-level construct, see
> "Multiple message-header fields with the same field-name MAY be present  
> in a message if and only if the entire field-value for that header field  
> is defined as a comma-separated list [i.e., #(values)]." --  
> <http://greenbytes.de/tech/webdav/draft-ietf-httpbis-p1-messaging-07.html#rfc.section.4.2>
> So you'd need to make it:
> origin       = "Origin" ":" origin-value
> origin-value = #foobar
> foobar       = "null" / serialized-origin
> Of course that means "null" could appear multiple times; if that is a  
> problem than that header format may not be the right choice.

I see. I suppose that as long as we impose restrictions on what clients  
are supposed to transmit this should not matter.

> PS: note that "null" matches case-insensitively, is that intended?

Case-sensitive would be better I guess.

Anne van Kesteren
Received on Friday, 2 October 2009 12:47:56 UTC

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