CORS settings

        location ~ ^/app1(\/)(.*)$ {

            if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Allow-Origin' 'http://localhost/app1/';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Max-Age' 1728000;
                add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
                add_header 'Content-Type' 'text/plain; charset=utf-8';
                add_header 'Content-Length' 0;
                return 204;
            }a

            if ($request_method = (GET|POST|OPTIONS|HEAD)) {
                add_header 'Access-Control-Allow-Origin' 'http://localhost/app1/';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
                add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
                add_header 'Access-Control-Allow-Credentials' 'true'
            }