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From fredk2 <fre...@gmail.com>
Subject [users@httpd] Re: Is there a known Header limit in mod_jk (or bug)?
Date Tue, 03 Mar 2009 13:01:26 GMT

Hi,

I kept on testing with the attributes max_packet_size and packetSize (in
worker.properties and server.xml) and it appears to fix the large header
problem.

Does this mean that all the headers together have to fit into a buffer which
size is set by max_packet_size?

Thanks - Fredk


fredk2 wrote:
> 
> 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
> 

-- 
View this message in context: http://www.nabble.com/Is-there-a-known-Header-limit-in-mod_jk-%28or-bug%29--tp22297260p22308224.html
Sent from the Apache HTTP Server - Users mailing list archive at Nabble.com.


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