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  <title>WebSocket Echo Test</title>
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  <h3>tested with tornado, aiohttp, twisted  websocket-servers py4web/utils/wsservers.py.txt</h3>
  <p>for gevent-websocket servers, pls, use _websocket test-example</p>
  <p>original: <a href = "https://www.includehelp.com/python/how-to-implement-a-websocket-server-using-tornado.aspx">
      https://www.includehelp.com/python/how-to-implement-a-websocket-server-using-tornado.aspx
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  <form i