Thanks for the posts Kenny & pbooth.

I have this problem as well. I am running nginx 1.15 under MacOS and also experience this under Windows.

Requests successfully go to the server specified under the location but are not received at the proxy_pass defined in the mirror location's proxy_pass. Switching between the two servers (swapping the mirror for the proxy_pass in the primary location) exhibits the same problem.

My config is:
```
http {
server {
listen 3333;
server_name localhost;

location / {
mirror /other;
proxy_pass http://localhost:3001;
}

location = /other {
internal;
proxy_pass http://localhost:3002;
}
}
}

events {
}
```
Based on your other post, it does not look like I need a resolver.

I've also tried with two servers--one localhost and one established server on another machine.

Any help greatly appreciated!

Jeff