Router to do NAT hairpinning

Configuration
42

Forgot the websockets.

    location /api/websocket {
        resolver 127.0.0.11 valid=30s;
        set $upstream_app hatest;
        set $upstream_port 8123;
        set $upstream_proto http;
        proxy_pass http://10.0.0.52:8123;

        proxy_set_header Host $host;

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }