Override a set_empty variable from http params

[Quintin Par]

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;


On Mon, Oct 15, 2012 at 1:35 PM, Igor Sysoev <igor at sysoev.ru> wrote:

> On Sun, Oct 14, 2012 at 11:30:22AM -0700, Quintin Par wrote:
> > 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.
>
> 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
>
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