Not an nginx expert but i think you can use a map
http://nginx.org/en/docs/http/ngx_http_map_module.html
You dont even need an if.

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Christ-Jan Wijtmans
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On Sun, Sep 27, 2015 at 10:32 AM, cacrus <nginx-forum@nginx.us> wrote:
> Hi ,
>
> I am trying to setup different authentication based on different strings in
> the $request , here is my case .
>
> location /parent/ {
> set $basic_file /nginx/conf/.htpasswd;
> if ($request_uri ~ (visualize|dashboard|settings)){
> set $basic_file /nginx/conf/.dev_pass;
> }
> proxy_pass http://<some ip and port >/;
> auth_basic "Restricted";
> auth_basic_user_file $basic_file;
> }
>
> I would like file .htpasswd to be used by default and in case of
> $request_uri having (visualize|dashboard|settings) , auth should happen via
> .dev_pass .
>
> For some reason the authentication is happening only via htpasswd even if
> i have (visualize|dashboard|settings) in the URI .
>
> Any idea , what am i missing?
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,261867,261867#msg-261867
>
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