Custom DNS resolver usage + proxied DNS

[workspace8]

Based on discussions here, it looks like the ability to set a custom DNS resolver was implemented here: #1125

Looking at the docs.rs, I see the usage as: Pass an Arc wrapping a trait object implementing Resolve. Overrides for specific names passed to resolve and resolve_to_addrs will still be applied on top of this resolver.

But, as a beginner, I was wondering if you can provide an example implementation?

Additionally, I wasn't able to find out if I use proxies (with no custom DNS), if the DNS requests to go /etc/resolv.conf defined resolvers or the proxy's DNS.

If I use proxies, are the DNS requests going through the proxies first?

Thank you.