I have a seemingly simple question about configuration, but have been
unable to find the answer through searching so far. I just want to override
the default 504 page when the upstream server times out, which I would have
thought would be handled by the error_page setting. Can anyone help?

My config looks like this (the variables are replaced before nginx is
started):
upstream jsweb {
server 127.0.0.1:8091;
}

server {
listen $PORT$;
server_name localhost;
root $CONTENT_ROOT$;

location / {
add_header X-Server-Name "$HOST_NAME$";
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_pass http://jsweb;
error_page 502 503 504 $OUTAGE_PAGE$;
}
}

And the errors in the logs look like:

2011/12/23 03:50:35 [error] 13736#0: *9 upstream timed out (110: Connection
timed out) while reading response header from upstream, client:
10.214.178.111, server: localhost, request: "GET /-/forgot_password
HTTP/1.1", upstream: "http://127.0.0.1:8091/", host: "staging.myapp.com"
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