Those errors aren't anything to worry about - the WebSocket connection is for https://github.com/espruino/EspruinoHost, which is a way to get Bluetooth LE and serial comms on non-Chrome web browsers. The connection failing isn't a problem - same with the /serial/ports bit. It's just trying to see what connection options are available.
What happens when you click the connect icon in the top left then? Does it say 'No ports found'? It should say Web Bluetooth, which you then click on and get a port selector.
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