proxy support on websockets

[sandsbai]

Hi,
The doc in https://github.com/bmoscon/cryptofeed/blob/master/examples/demo_concurrent_proxy.py said "http_proxy' will only be used for GET requests (not Websockets).", I just wanna know why for websocket's support on proxy is so important.
Without proxy support on websocket, this cryptofeed framework do not work in some areas of the world.
Thanks