How to control the order of execution modules in nginx

[Maxim Dounin]

Hello!

On Thu, Jan 30, 2014 at 01:05:34PM +0800, Rv Rv wrote:

> From http://www.evanmiller.org/nginx-modules-guide.html, "The 
> order of their execution is determined at compile-time". Is 
> there a way to control this. ngx_modules.c has the list and 
> order of execution. How do I change the order of execution of 
> modules within a particular phase e.g. if I have three modules 
> within the access phase, is there a way to control the order of 
> execution with the access phase. 

Order of execution of modules in a particular phase is set during 
a configure, modules which are last in HTTP_MODULES are executed 
first.

That is, if you want to add "module1", "module2", and "module3", 
all of them use the access phase, and each of them does something 
like

    HTTP_MODULES="$HTTP_MODULES moduleN"

in it's "config" file, you should do something like

    ./configure --add-module=module3 \
                --add-module=module2 \
                --add-module=module1

to get the "module1 -> module2 -> module3" order.

Note that it may non-trivial to, e.g., make sure your module is 
called after standard modules in the access phase.

-- 
Maxim Dounin
http://nginx.org/