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A possible problem is that ws://hostname:9090 is unlikely to be your machine name. Use ws://localhost:9090 or ws://<your ip="">:9090 (eg. ws://192.168.0.1:9090)

If that doesn't help, could you tell me what browser you're using? There are a variety of websocket client implementations out there; some older browsers use variants of the protocol that may be outdated and therefore not compatible with rosbridge. If you find that you are using an old or obscure browser, can you try testing your code on the latest chromium or firefox and see if that helps?

Thanks, Jon