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RE: crazy ivan question? (sparql.org issues)

From: Seaborne, Andy <andy.seaborne@hp.com>
Date: Wed, 28 May 2008 16:48:34 +0000
To: "Seaborne, Andy" <andy.seaborne@hp.com>, Manu Sporny <msporny@digitalbazaar.com>, W3C RDFa task force <public-rdf-in-xhtml-tf@w3.org>
CC: Benjamin Nowack <bnowack@semsol.com>
Message-ID: <38CBA1F6A350B044AF785E63AAC3C677649B46794A@G5W0276.americas.hpqcorp.net>
> > Andy - any chance that this could be fixed? I know you looked into it in
> > February, but we're depending pretty heavily on sparql.org now that
> > Virtuoso isn't working for our isBlank() queries.
> I tracked this down (I think) to the fact that the web server used (Jetty)
> has limitations on handling GET requests (Google finds many such reports).
> But it's only GET.
> If you swap to using POST then you should be OK.  And given potential, if
> unlikely, caching, you want POST anyway.
> There was a message from OpenLink recently (yesterday on jena-
> devel@lists.soureforge.nt) saying they will be implementing blank nodes
> labels (which is what stops them currently).  Then they will be able to
> support the whole of the Jena API as well as be SPARQL compliant for
> isBlank().
>       Andy

OK - one upgrade and one large hammer later, I have a version that handles requests up to about 16Kbyte.

BUT.  It just then runs into the other problem.

Squid servers, often used for proxies, are limited to 4K URLs.  There is nothing I can do about that - either make sure you go direct and live to sparql.org or (better!) use POST.  I tested this by going through our firewall either via socks raw (works) or the caching proxy (does not work - get proxy error message).

Received on Wednesday, 28 May 2008 16:49:58 UTC

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