Nginx on ubuntu 12.04 keep refusing OPTIONS requests

I am trying do do cross domain Ajax calls inside an angular service in an ionic application tested in chrome.
I am trying to do a POST on my API and nginx keep refusing my OPTIONS.

XMLHttpRequest cannot load http://wss.dev:8080/api/checkin. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3000' is therefore not allowed access. The response had HTTP status code 405.

I tried different configuration but none of seems to work.

My conf is a follow :

server {
   listen                *:8080;

 server_name           wss.dev www.wss.dev;
 client_max_body_size 200m;

 index  index.html index.htm index.php;

 access_log            /var/log/nginx/wss.dev.access.log;
 error_log             /var/log/nginx/wss.dev.error.log;
 add_header 'Access-Control-Allow-Origin' $http_origin;
 add_header 'Access-Control-Allow-Credentials' 'true';
 add_header 'Access-Control-Allow-Methods' 'OPTIONS, GET, POST, PUT, DELETE' ;
 add_header 'Access-Control-Allow-Headers' 'Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Mx-ReqToken,X-Requested-With,XMLHttpRequest';

 location ~ .php$ {

     root  /var/www/public;
     try_files $uri $uri/ /index.php /index.php$is_args$args$is_args$args;
     index  index.html index.htm index.php;
     fastcgi_index index.php;
     fastcgi_param SCRIPT_FILENAME $request_filename;
     fastcgi_param APPLICATION_ENV dev;
     fastcgi_pass 127.0.0.1:9000;
     fastcgi_split_path_info ^(.+\.php)(/.*)$;
     include fastcgi_params;
 }
 location / {

     root  /var/www/public;
     try_files $uri $uri/ index.php /index.php$is_args$args;
 }
 sendfile off;
}

I tried like in this example :
https://michielkalkman.com/snippets/nginx-cors-open-configuration.html

I tried different configurations and I tried to change the my alls are made in angular but nothing works…