NGinx - CORS proxy

gistfile1.nginxconf

    location /foo {
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'POST, GET, PUT, DELETE, OPTIONS';
            add_header 'Access-Control-Allow-Headers' '*';

            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain charset=UTF-8';
            add_header 'Content-Length' 0;

            return 200;
         }

        proxy_pass http://foo.com/;
    }