Order of execution of nginx filters

[B.R.]

AFAIK you do not control the order of filters, and when you are building a
filter, you deal with data on-the-fly, which means your filter might be
invoked with a partial response coming from other filters.
Moreover, the module needs to 'win' its selection on a specific event.

I suggest you read some available literature (ex:
http://www.evanmiller.org/nginx-modules-guide.html, specifically
http://www.evanmiller.org/nginx-modules-guide.html#filters-body which seems
to implement something close to what you wish).

​There is most probably more competent people to that matter who would give
you better docs, but this is a head start I guess.​
---
*B. R.*

On Tue, Jul 5, 2016 at 6:06 AM, Raghavan, Gopal <gopal.raghavan at here.com>
wrote:

> Hi,
>
>
>
> I have the following three directives:
>
>
>
> location = /hello {
>
>                  hello_world;
>
>                  hola_mundo on;
>
>                  bonjour_monde on;
>
> }
>
>
>
> hello_world is an nginx handler module that provides content “hello world”
>
> hola_mundo and bonjour_monde are filters that add to the chain strings
> “hola mundo” and “bonjour monde” respectively.
>
>
>
>
>
> Here is the output:
>
> curl  "http://localhost:8090/hello"
>
> hello worldhola mundobonjour monde
>
>
>
>
>
> Switching the filter directives in location block has no impact on output
> string.
>
>
>
> For eg:
>
>
>
> location = /hello {
>
>                  hello_world;
>
> bonjour_monde on;
>
>                  hola_mundo on;
>
> }
>
>
>
> Here is the output:
>
> curl  "http://localhost:8090/hello"
>
> hello worldhola mundobonjour monde
>
>
>
>
>
> How do I control the order of execution of filters?
>
> I already looked at objs/ngx_modules.c and auto/modules. My custom
> handlers and filters are not listed there.
>
>
>
> One thing that I observed is that the order of listing the load_module
> modules/*.so in conf/nginx.conf does impact the order of execution of the
> filters.
>
>
>
> Is there any other trick to adjust the execution order within the location
> block?
>
>
>
> Thanks,
>
> --
>
> Gopal
>
>
>
>
>
>
>
>
>
>
>
>
>
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