text: <!DOCTYPE html>
  <html>
    <head>
      <script src="/ws.js" async defer></script>
    </head>
    <body>
      <h1>Welcome to echo server!</h1>
      <input type="text" placeholder="Your message" id="input"
        style="visibility: hidden">
      <div id="responses"></div>
    </body>
  </html>
  