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RE: ACTION: The order of HTTP Headers

From: James Pearce <jpearce@mtld.mobi>
Date: Wed, 23 May 2007 13:35:51 +0100
Message-ID: <C8FFD98530207F40BD8D2CAD608B50B4335DFE@mtldsvr01.DotMobi.local>
To: "Jo Rabin" <jrabin@mtld.mobi>, <public-mobileok-checker@w3.org>

As I understand this, the ordering of headers with the same name is
significant.

Oooh. Someone might have to have to use axes...

(For which, by the way,
http://nwalsh.com/docs/tutorials/xsl/xsl/graphics/axes.gif is a very
handy cheatsheat - my token pearl of wisdom for this particular topic)


JP



-----Original Message-----
From: public-mobileok-checker-request@w3.org
[mailto:public-mobileok-checker-request@w3.org] On Behalf Of Jo Rabin
Sent: 23 May 2007 12:44
To: public-mobileok-checker@w3.org
Subject: ACTION: The order of HTTP Headers


According to Section 4.2 of RFC 2616 [1]

   The order in which header fields with differing field names are
   received is not significant. However, it is "good practice" to send
   general-header fields first, followed by request-header or response-
   header fields, and ending with the entity-header fields.

   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)].
   It MUST be possible to combine the multiple header fields into one
   "field-name: field-value" pair, without changing the semantics of the
   message, by appending each subsequent field-value to the first, each
   separated by a comma. The order in which header fields with the same
   field-name are received is therefore significant to the
   interpretation of the combined field value, and thus a proxy MUST NOT
   change the order of these field values when a message is forwarded.

For moki, I would prefer to maintain the ordering as received. I'm not
sure that this makes it either easier or harder select values ...

e.g. //primaryDoc//HTTPResponse[last()]/header[@name="charlie"] does not
depend on the ordering ...

Jo

[1] http://tools.ietf.org/html/rfc2616#section-4.2
Received on Wednesday, 23 May 2007 12:36:12 GMT

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