Bug: https + ws doesn't work at the dev server

[pigareva]

Do you want to request a feature or report a bug?

I think it's a bug

What is the current behavior?
I have the following error
WebSocket connection to 'wss://127.0.0.1:8083/rtu/' failed: Error in connection establishment: net::ERR_CONNECTION_CLOSED
Websocket does not work

If the current behavior is a bug, please provide the steps to reproduce.

Here is my config: https://gist.github.com/pigareva/0ae61d127de6b6a22812b377e8c3e193

What is the expected behavior?
I would like to have Hot Module Replacement for my app, where both types of requests, websocket and http, work.

If this is a feature request, what is motivation or use case for changing the behavior?

Please mention your webpack and Operating System version.
"webpack": "3.4.1",
"webpack-dev-server": "2.6.1"
macOS Sierra 10.12.5

Many thanks!

[shellscape]

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