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Module Loading Order for Apache 2

 
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alexerwin



Joined: 24 Mar 2009
Posts: 14

PostPosted: Sun 12 Jul '09 5:14    Post subject: Module Loading Order for Apache 2 Reply with quote

Hi,

I am having some trouble. Mod_Rewrite is loading and executing before Mod_Security and a custom module I wrote. I need variables set by Mod_Security and my custom module for Mod_Rewrite.

Not sure which configuration file you need me to post

Thanks
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 4948
Location: Germany, Next to Hamburg

PostPosted: Thu 13 Aug '09 20:19    Post subject: Reply with quote

A maybe nerfing solution is to start apache in debug mode so you can see when which module loads. I'm note sure if it makes a difference to change the loading order in httpd.conf
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glsmith
Moderator


Joined: 16 Oct 2007
Posts: 1650
Location: Sun Diego, CA, USofA

PostPosted: Thu 13 Aug '09 21:39    Post subject: Reply with quote

It does look like they load in order to me
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tdonovan
Moderator


Joined: 17 Dec 2005
Posts: 610
Location: Milford, MA, USA

PostPosted: Fri 14 Aug '09 4:21    Post subject: Reply with quote

If you assign something to the environment variable SHOW_HOOKS and then start Apache from the command line, it will display the sorting of modules for each hook. Note that this is an OS-environment variable that you set on the command line, not an Apache-environment variable that you set in httpd.conf.
For example:
Code:
SET SHOW_HOOKS=1
httpd.exe -t

If you use mod_info, another way to see this is to browse to http://localhost/server-info#request_hooks.

In your custom module code, you should pass a NULL-terminated string array of the modules that you want to load before and after your module in your call to ap_hook_whatever. For example, if you use the "fixups" hook:
Code:
static const char * const aszPre[] ={ "mod_security2.c", NULL };
static const char * const aszPost[]={ "mod_rewrite.c", NULL };
ap_hook_fixups(my_fixup, aszPre, aszPost, APR_HOOK_MIDDLE);

Nick Kew's book on Apache Modules explains this stuff well. Recommended if you want to write your own Apache modules.

-tom-
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