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caching HTTP 303 responses

From: Eyal Oren <eyal.oren@deri.org>
Date: Mon, 9 Jul 2007 20:26:50 +0100
To: semantic-web@w3.org
Message-ID: <20070709192650.GA10670@localhost>

Hi,

I've a question regarding serving RDF content using HTTP 303 redirects. For 
example, foaf:name [1] redirects to http://xmlns.com/foaf/spec using HTTP 
303.  The, I believe relevant, RFC 2616 says that HTTP 303 responses MUST 
NOT be cached, although the result may be cached [2].

Does this mean, that I have to check every single time what foaf:name 
redirects to? Or am I allowed to remember that foaf:name redirects to its 
spec? Squid for example will not cache this redirect exactly because it is 
a 303.  

Unless I'm misunderstanding something, it seems that when I'm processing 
lots of documents by de-referencing their URIs, I must dereference 
foaf:name every single time, only to be redirected to the same location, 
after which I can use my local copy.  Requesting this HTTP header using eg.  
curl takes around 0.33s, which I'd think is rather a lot when processing 
thousands of foaf files containing tens of foaf properties each.

My question: why are HTTP 303 codes being suggested [3],[4] instead of 
cacheable response such as 301 or was caching not an issue in drafting 
these suggestions?

 -eyal

[1] http://xmlns.com/foaf/0.1/name
[2] http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
[3] http://www.w3.org/TR/swbp-vocab-pub/#redirect
[4] http://www.dfki.uni-kl.de/~sauermann/2006/11/cooluris/
Received on Monday, 9 July 2007 19:28:09 GMT

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