Override a set_empty variable from http params

Server NGINX
1

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.

2

On Sun, Oct 14, 2012 at 11:30:22AM -0700, Quintin P. 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 S.

3

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;