Why don't current websocket client implementations support proxies?

Question

A Web Socket detects the presence of a proxy server and automatically sets up a tunnel to pass through the proxy. The tunnel is established by issuing an HTTP

Answer 1

websocket-client, a Python package, supports proxies, at the very least over secure scheme wss:// as in that case proxy need no be aware of the traffic it forwards.

https://github.com/liris/websocket-client/commit/9f4cdb9ec982bfedb9270e883adab2e028bbd8e9