https://github.com/websockets/ws/blob/68614728c164eb55462ff12ba24cb30451d28ec6/lib/websocket-server.js#L379-L414
The response appears to be sent back through the socket itself.
This PR is intended to add a path forward to natively support Websockets and similar protocols directly in SvelteKit by implementing an `UPGRADE` handler to be used similarly to existing `GET`, `PO...