Rails 4, nginx and Passenger

myapp.conf

server {
    listen 80;
    server_name ums.harukaeduapps.com;

    # Tell Nginx and Passenger where your app's 'public' directory is
    root /home/deploy/htdocs/ums/current/public;

    # Turn on Passenger
    passenger_enabled on;

    location ~ ^/assets/ {
        expires 1y;
        add_header Cache-Control public;
 
        add_header ETag "";
        break;
    }
}