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From Garret Wilson <>
Subject Re: valid XHTML 1.1, Tomcat, text/xml, and @!&* IE
Date Sat, 18 Sep 2004 21:48:05 GMT
Hassan Schroeder wrote:
> Garret Wilson wrote:
>> Thanks for the example. Note, however, that you're example 
>> doesn't enumerate *all* the accept headers, which means it won't work 
>> if a browser decides to sent each accept string as a separate header.
> True -- is that legal? I just looked at RFC2616 and it doesn't seem
> to be explicitly specified, so...

    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.

(RFC 2616, 32)

(I ran into several years ago working on a SIP processor, but that's 
another story.)

> I know I've never seen a UA do that
> but if it's possible, Murphy will make it happen at the worst possible
> time :-)

Well, considering 9X% of the market is using Murphysoft browsers, we 
better code for that possibility... ;)

I found an article that gives a nice overview of the situation we've 
been discussing:



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