resolve to specific address over proxy

[tahmid-23]

I want to connect to HTTPS over a proxy using a specific IP address.
The proxy should tunnel with a specific IP address, but TLS should verify with the intended hostname.
For reference, this is possible with cURL's --connect-to flag. curl -x http://proxy.url --connect-to original.com::3.14.15.92 https://original.com

I think ideally the dns overrides set in the client builder would take precedence over the host in the url, if present, when creating a tunnel.
Does this seem ideal, or is there a better way to specify this behavior? I can write a PR.