I wanted check whether the resolver solves the DNS in a dynamic manner when the ip addresses changes.

So I add the given code after several findings and yet the resolving the ip address is not happening.

server{
...........

resolver 8.8.8.8 valid=30s;
resolver_timeout 10s;
set $upstream "example.net";

location / {
rewrite ^/(.*) /$1 break;
proxy_pass https://$upstream:3000;


}

}