Clean way to deploy a proxy client

Hello,

I need to implement a proxy (client side) with Wangle. The proxy server is already there, which is a simple HTTP proxy - the client can `CONNECT` to it, and send the message via the tunnel.

So I already have a pipeline ready, which is able to communicate with the destination directly. Does anyone have good ideas how to extend the original pipeline to support proxy? (ie. the direct destination is fixed to be the proxy while each connection can be configured in advance for the actual destination. I have no idea how to `CONNECT` to the server and distinguish different connections based on the actual destination.)

Thanks in advance!

Zhenyu