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From Jochen WiƟmann <>
Subject mod_jk how to add JK_WORKER_NAME to http-header
Date Tue, 26 Feb 2013 18:41:44 GMT

i am trying to find an easy way to determine from the http-client side, 
which  AJP13-worker handled my request.
So my basic idea is to use mod_header to add mod_jk`s env-variable 
JK_WORKER_NAME to the Header of the http-response.
I tried to get something like this working:

Header add TC-Server "%{JK_WORKER_NAME}e"

All my previous attempts resulted in http-responses looking like this:

< HTTP/1.1 200 OK
< Set-Cookie: ARPT=LRWQXVS110.160.11.26CKMLQ; path=/
< Date: Tue, 26 Feb 2013 18:25:31 GMT
< Server: Apache/2.2.22 (Unix) mod_jk/1.2.36 mod_ssl/2.2.22 
OpenSSL/0.9.8x DAV/2
< Set-Cookie: JSESSIONID=A4052BF60BA2007F0B0F47E2699AFDE.liferay0; Path=/
< Set-Cookie: GUEST_LANGUAGE_ID=en_US; Expires=Wed, 26-Feb-2014 18:25:31 
GMT; Path=/
< Set-Cookie: COOKIE_SUPPORT=true; Expires=Wed, 26-Feb-2014 18:25:31 
GMT; Path=/
< Liferay-Portal: Liferay Portal Community Edition 6.0.6 CE (Bunyan / 
Build 6006 / February 17, 2011)
< ETag: "838b4ae2"
< Content-Length: 8043
< X-Server-Ip:
< TC-Server: (null)
< Content-Type: text/html;charset=utf-8

Why do i get "TC-Server: (null)" ?
Using the Variable JK_WORKER_NAME to log the worker's name via 
mod_log_config works fine.

Am i missing something? Is it even possible to access the env-variable 
JK_WORKER_NAME with module mod_header?
Could anyone please help?


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