Forum: NGINX Override a set_empty variable from http params

Hi all,

I set the some params to my backend server as shown below

set_if_empty $country_code $http_x_country_code;

proxy_set_header   X-Country-Code   $country_code;

Now the http_x_country_code comes via the GeoIP module.

Is there a way here I can override this based on an HTTP param I can 
set.

Say site.com/country=US and country variable has greater precedence over
the http_x_country_code.

On Sun, Oct 14, 2012 at 11:30:22AM -0700, Quintin Par wrote:
> Is there a way here I can override this based on an HTTP param I can set.
>
> Say site.com/country=US and country variable has greater precedence over
> the http_x_country_code.

Using "map" you can define:

http {

    map  $arg_country          $country_code {
         ""                    $header_country;
         default               $arg_country;
    }

    map  $http_x_country_code  $header_country {
         ""                    $geoip_country_code;
         default               $http_x_country_code;
    }

    ...

    location / {
        proxy_set_header  X-Country-Code   $country_code;
        ...


--
Igor Sysoev
http://nginx.com/support.html

Igor,
Is this correct?

set $country_code $arg_country;
set_if_empty $country_code $geoip_country_code;
proxy_set_header   X-Country-Code   $country_code;