How to configure Nginx to do this?

Question

Nginx

Nginx acts as a proxy web server. It redirects all requests to the internal network web server. How can I make Nginx immediately indicate that the internal web server is unavailable if the user tries to type an address in the browser's address bar? Now I have to wait for Nginx to show a 502 error

Answer 1

For example, via the upstream module :

upstream intraserver {
  server internal-ip:port max_fails=2 fail_timeout=10;
  server 127.0.0.2:8880 backup;
}

server {
  listen 127.0.0.2:8880;
  return 502;
}
server {
...
proxy_pass http://intraserver;
...
}

max_fails - number of connection or response errors (determined before the proxy_pass function ) for the fail_timeout period , starting from which the upstream is considered to be down;
backup - a parameter indicating what should be transferred there, if all other upstreams are lying, in the config it gives 502 to everything.