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    public static WebSocket<String> pingWs() {
        return new WebSocket<String>() {
            @Override
            public void onReady(In<String> in, Out<String> out) {

                in.onMessage(new F.Callback<String>() {
                    @Override
                    public void invoke(String s) throws Throwable {
                        System.out.println(s);
                    }
                });

                in.onClose(new F.Callback0() {
                    @Override
                    public void invoke() throws Throwable {
                        System.out.println("Disconnected");
                    }
                });

                out.write("Hello");
            }
        };
    }