Lack of proxy support with credentials

[mamchech]

I tried to setup a socket with a proxy using the Proxy property (IProxyConnector from supersocket) but there is no way to pass the authorization header "Proxy-Authorization" for credentials.

Note : I tried to workaround the issue by using customHeaderItems in the websocket constructor but it does not work.

[serkancantech]

Any progress about this issue? @kerryjiang @khellang @mattleibow @moshegutman

[khellang]

I have no idea what this issue is 😅