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Date: Mon, 2 Mar 2009 13:38:20 -0800 (PST)
From: fredk2 <fredk2@gmail.com>
To: users@httpd.apache.org
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Subject: [users@httpd] Is there a known Header limit in mod_jk (or bug)?


Hi,

When I send a request to Tomcat via mod_jk I get the following error (code
413):

Request Entity Too Large
The requested resource
/myapp/jsp/cookieshowvalue.jsp
does not allow request data with GET requests, or the amount of data
provided in the request exceeds the capacity limit. 

I total size of my headers/cookies is about 7.5KB on Solaris 10 and 9.8KB on
RH Linux. I made sure that Apache's limit was set way above its default of
8K (LimitRequestFieldSize 25000)

The mod_jk logfiles shows:
[Mon Mar 02 14:42:22.856 2009] [27893:4136860560] [error]
ajp_marshal_into_msgb::jk_ajp_common.c (417): failed appending the header
value
[Mon Mar 02 14:42:22.856 2009] [27893:4136860560] [info]
ajp_service::jk_ajp_common.c (2042): Creating AJP message failed, without
recovery
[Mon Mar 02 14:42:22.856 2009] [27893:4136860560] [info]
service::jk_lb_worker.c (1188): unrecoverable error 413, request failed.
Client failed in the middle of request, we can't recover to another
instance.
[Mon Mar 02 14:42:22.856 2009] myWorker test.domain.com
/myapp/jsp/cookieshowvalue.jsp 200 0.000316 0 HTTP/1.1 GET
[Mon Mar 02 14:42:22.856 2009] [27893:4136860560] [info]
jk_handler::mod_jk.c (2357): Aborting connection for worker=myWorker

The problem is apparent with any version of Apache or mod_jk or Tomcat (I am
testing with 2.2.11, 1.2.26, 6.0.14)

I read the following doc
http://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html which says there is
no limit:

"This works on the assumption that no header names will have length greater
than 0x9999 (==0xA000 - 1), which is perfectly reasonable, though somewhat
arbitrary. (If you, like me, started to think about the cookie spec here,
and about how long headers can get, fear not -- this limit is on header
names not header values. It seems unlikely that unmanageably huge header
names will be showing up in the HTTP spec any time soon)."

I tried to read some of the source code jk_ajp_common.c ... but i cannot
figure out where the limit for the header array(s) comes from.

Any idea guidance troubleshooting tips are welcome...

Regards - Fred
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