I have created a spinner for a customer (loading animation) and then the site refreshes every 5 seconds. But I don’t have access to their platform right now, so I’ll give you a link to a pretty good example in the first answer:
http://stackoverflow.com/questions/10895071/how-to-create-custom-error-502-nginx-in-core-of-nginx-not-using-redirect-to-err

@17CupsOfCoffee

The issue here is the delay with Ghost. There’s really no way to preload Ghost so that it comes up at the same time as NGINX as Ghost relies on npm to do its thing before starting up.

If you start Ghost first, there’s no web server to handle the requests during the delay and the only way to access Ghost would be using a port, if you’ve set it to work on a public IP – you’d still be getting an error since requests on port 80 will fail.

If you start NGINX first, then you’re waiting on Ghost, thus since NGINX can’t access Ghost right now, you get the 502 since NGINX can’t proxy.