I can't get utf-8 support working. I tried downgrading the client to socketio-1.7.4, but that doesn't seem to help. Apparently there is a breaking change in sio 2.0.0 (socketio/engine.io-parser#81). The problem is I don't know what version of the js client this implementation supports/is based on.
My client is socketio 2.0.4. My server is python-socketio 4.2.0.