How can I make Nginx return HTTP 503 when my proxied app server is down?

Question

I have an nginx web server sitting in front of a Jetty Java app server running a web application.

I'd like to configure nginx to return a HTTP 503 if the proxied Jetty server is down.

This way when I bring the app server down for maintenance, of if it happens to crash, a 503 is returned to any clients letting them know the site is temporarily unavailable.

However, with the basic configuration, Nginx returns a HTTP 502 Bad Gateway when it can't connect to the proxy_pass location.

Is it possible to configure nginx to report a 503 instead?

Answer 1

You can do so by setting an error page.

error_page 502 =503 /maintenance.html