Here is another use-case where someone needs SRU/POST.
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Date: Thu, 07 Jul 2005 15:38:59 +0200
From: Ko van der Sloot <[log in to unmask]>
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Subject: [Yazlist] large HTTP GET's
Reply-To: "Discussion on the YAZ Z39.50 toolkit" <[log in to unmask]>
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Hello,
We encountered the following problem(s):
We have an SRU/SRW service build, based on the Generic File Server.
One of our applications tries to send very large (>16.000 bytes) GET
requests to the service.
This fails with an HTTP 500 message.
The reason is that in comstack.c there is a 8192 byte limit set to HTTP
headers. (in cs_complete_auto)
I can see some reason behind limitting. But why not some more?
According to RFC 2616 3.2.1 URI's can be of unbound length. Which is
maybe a bit to much ;)
But anyawy: If the limit is exceeded, an 414 (Request-URI Too Long)
should be returned.
Lifting the limit solves our problem.
Then we also tried converting GET to POST.
This fails because the yaz_sru_decode() function (in srwutil.c) only
supports GET.
It was not that difficult to add some code to handle POST, but i'm not
so sure that it is an optimal/general/conforming solution.
So what to do now?
We could propose a patch to raise the HTTP header limit to "unbounded"
(say 100K)
We could propose a patch to add POST support to SRU. (We have a working
hack)
We could do both.
any comments?
Ko vd Sloot
Tilburg University
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