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I've seen implementations in the wild that send 'Upgrade: WebSocket', which currently fails the handshake. From https://datatracker.ietf.org/doc/html/rfc6455: "If the response lacks an |Upgrade| header field or the |Upgrade| header field contains a value that is not an ASCII case-insensitive match for the value "websocket", the client MUST _Fail the WebSocket Connection_."