[occi-wg] HTTP Header Serialization Format, use of Attribute header

[Edmonds, AndrewX]

:-)

Be aware of the multiple header keys aspect e.g.

...
Attribute: occi.compute.cores=2
Attribute: occi.compute.speed=2.4
...

My experience is that many web frameworks do not observe 2616 correctly. Taking tomcat and associated frameworks; if I send such a request as above the only header that I will receive is the last one, not all. Web.py also exhibits this same behavior. As a result you will always have to formulate your request as such:

Attribute: occi.compute.cores=2, occi.compute.speed=2.4

This particular issue is not a problem using a request like:

...
occi.compute.cores=2
occi.compute.speed=2.4
...

However the issue remains for Link and Category headers.

Andy

-----Original Message-----
From: Ralf Nyren [mailto:ralf at nyren.net] 
Sent: Wednesday, August 11, 2010 11:43 AM
To: Edmonds, AndrewX; occi-wg at ogf.org
Subject: Re: [occi-wg] HTTP Header Serialization Format, use of Attribute header

On Wed, 11 Aug 2010 12:30:41 +0200, Edmonds, AndrewX  
<andrewx.edmonds at intel.com> wrote:

> Speaking from an implementer's point of view (mine) removal of  
> "Attribute:" has made parsing of header key/values easier. Personally, I  
> have no strong tie to either approach.

I would beg to differ on that point :)
I am also an implementor and using the Attribute header I can just reuse  
the same base functionality as for parsing Category and Link headers.
Since RFC2616 says multiple header values can be represented both as  
comma-separated lists and multiple header lines the code for parsing this  
with proper escaping of quotes etc will have to be present anyway.

regards, Ralf
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