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From "Pranesh Vadhirajan" <>
Subject RE: [users@httpd] Apache 2.2.3 Session tracking with mod_session produces load error on module load
Date Mon, 24 Oct 2011 16:01:26 GMT
Thanks for your responses, Nick Kew and Mark Montague.  I'm very new to
developing modules with Apache and I'm not sure that I would be able to
backport modules from Apache 2.3 to 2.2.  Certainly seems very unlikely
considering that I would have to do this in less than two weeks
(specifically November 2). It seems that I would need some other approach or
a module that was built for 2.2.  Anyway, all I need to do is to correlate
"clicks" with their user, so I really just need a way to find a user's
session info somehow to track requests of a user.  If I don't need
mod_session for this, then I have no need to use it.  If you know of a
better approach or a 2.2 module that I can use to get this information,
please let me know. I will look into getting session info from the web
content management system that we use, but I'm afraid this will induce more
complexities as far as correlating Apache handoffs to the content management
system (Drupal).  I don't believe it's possible for us to upgrade to Apache
2.3 due to the deadlines involved.       


-----Original Message-----
From: Mark Montague [] 
Sent: Monday, October 24, 2011 11:20 AM
Subject: Re: [users@httpd] Apache 2.2.3 Session tracking with mod_session
produces load error on module load

On October 24, 2011 10:44 , "Pranesh Vadhirajan" 
<> wrote:
> I am trying to use the mod_session module.  Since mod_session is built
> into Apache for versions 2.3 or later, in order for me to use it on
> our Apache 2.2.3 server, I tried to build it from source. [...] I'm
> getting the following error:
> error: httpd: Syntax error on line 217 of /etc/httpd/conf/httpd.conf:
> Cannot load /usr/lib64/httpd/modules/ into server:
> /usr/lib64/httpd/modules/ undefined symbol:
> session_module.
> I don't know if there is a library that I'm supposed to load before I
> load this module. If you know the cause of this error, or if there is
> a better way to gather session information on Apache 2.2.3 please let
> me know.

(By the way, if Nick or another big Apache HTTP Server developer says 
you don't need to worry about the things I describe below, believe him 
and not me.)

The Apache HTTP Server API has changed substantially between 2.2 and 2.3 
(2.4).  Because of this, in general, I would not expect modules written 
for 2.3/2.4 to work with 2.2.  You might get lucky, but if you want to 
run mod_session in a production environment, would you be comfortable 
gambling on this, even if you get the module to compile, load, and it 
appear to work for the cases you test?

If you are comfortable developing modules and would like to backport 
mod_session from 2.3 to 2.2, a list of the API changes is available at

The above document describes what is needed to port a module forward 
from 2.2 to 2.4.  You'd need to reverse everything described in order to 
back-port modules from 2.3 to 2.2.

In addition to mod_session, you may also need at least one of 
mod_session_crypto, mod_session_cookie, or mod_session_dbd.  See the 
documentation (3rd paragraph) at

2.4 is close enough to being released that you might want to consider 
upgrading to 2.3 now instead of trying to get a 2.3 module to work with 
2.2.  I've been running 2.3 since 2.3.5-beta and have been happy with 
it; 2.3.14-beta is the current release.

   Mark Montague

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