Hello,

I have a reverse proxy up and would like to replace the 504 Gateway
timeout with an error page.

I saw that we have these options when doing loadbalancing:

proxy_next_upstream error timeout invalid_header;

## Backend servers (web1 is the primary and web2 will come up if web1 is down)
upstream webbackend {
server web1.domain.lan weight=10 max_fails=3 fail_timeout=30s;
server web2.domain.lan weight=1 backup;
}


When I have a single backend server (do not deploy load balancing)
What is the best way to redirect those cases (error timeout
invalid_header) to error pages , and also a log?

Is there any other possible error that iam missing that would
indicate problems with the backend server?

Thanks

David

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