<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">

  <title>Youka</title>
  <meta name="description" content="">
  <meta name="author" content="">

  <link rel="stylesheet" href="/bundle.css">
  <link href='http://fonts.googleapis.com/css?family=Lato:300,400,700,400italic' rel='stylesheet' type='text/css'>
</head>
<body>
  <div class="application"></div>
  <script src="http://localhost:9000/socket.io/socket.io.js"></script>
  <script src="/bundle.js"></script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">

  <title>Youka</title>
  <meta name="description" content="">
  <meta name="author" content="">

  <link rel="stylesheet" href="/bundle.css">
  <link href='http://fonts.googleapis.com/css?family=Lato:300,400,700,400italic' rel='stylesheet' type='text/css'>
</head>
<body>
  <div class="application"></div>
  <script src="/socket.io/socket.io.js"></script>
  <script src="/bundle.js"></script>
</body>
</html>

Edit soket.io.js url to relative url
Edit soket.io.js url to relative url
