Wishlist: Websocket Support

[jeremyjh]

It looks like presently there is not Websocket support. I was hoping to use this plug to proxy to a next.js server, which uses a websocket for webpack-hmr (hot loading). Presently it times out establishing a connection.

[slogsdon]

While it could be technically possible, the only way to achieve this is to add adapter specific code since Plug does not yet support websockets. I'd like to see more input/thoughts from others