Hi Francis--

We got this working to wrap up the day. My ignorance of nginx meant that I was interpreting the example literally--I viewed the "/mirror" as the name for the internal route, but that actually becomes part of the URL the mirror location proxy forwards to.

http {
server {
listen 3333;
server_name localhost;

location / {
mirror /;
resolver 8.8.8.8; # I shouldn't need this, will test tomorrow
proxy_pass http://1.2.3.4:3001;
}

location = / {
internal;
resolver 8.8.8.8;
set $upstream_endpoint http://1.2.3.4:3002;
proxy_pass $upstream_endpoint$request_uri;
}
}
}

That works like a champ. Initially I was trying to use localhost as the proxy_pass destination, and had turned on port forwarding at my router, but for whatever reason that was having troubles.

Many thanks in any case!

Jeff