add check_origin handler to gateway WebSocketChannelsHandler #340
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This was already merged on jupyter/notebook:
https://github.com/jupyter/notebook/blob/cd7a06ce88387b70c3dbe1bca6ab5ae222e28c60/notebook/gateway/handlers.py#L35
It makes sure the Websocket handler of the Gateway respects the user config of allow_origin.
Happy to change anything if this is not correct/desired for the jupyter_server repo!