Wait for backend

[duda]

Hi

I have one backend:

upstream backend_1 {
      server 127.0.0.1:35510;
}

and server:

server {
  ...
  location / {
        proxy_pass http://backend_1;
  }
}


Sometimes I have to restart my backend and it is unavailable for 3-5sec
(port unreachable)

How I can tell nginx to "wait" for backend and do not respond with 502 ?
So it should hold connection for 5 second and if it is unreachable in that
interval responds 502 to client.

Thanks

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,280293,280293#msg-280293