anchor.diff:  
   === The client side
   
  -In client side JavaScript you use the SockJS client side library to make connections.
  -
  -You can find that http://cdn.jsdelivr.net/sockjs/0.3.4/sockjs.min.js[here].
  +In client side JavaScript you use the SockJS client side library to make connections. For convenience the package is
  +available on https://www.npmjs.com/package/sockjs-client[https://www.npmjs.com/package/sockjs-client].
  +
  +This means you can refer to it from bundlers or build tools. If however you want to get a `CDN` version to use directly
  +on your `HTML` document, first you need to refer to the sockjs dependency:
  +
  +[source,html]
  +----
  +<html>
  +<head>
  +  <script src="https://unpkg.io/sockjs-client@1.5.0/dist/sockjs.min.js"></script>
  +</head>
  +<body>
  +  ...
  +</body>
  +</html>
  +----
   
   Full details for using the SockJS JavaScript client are on the https://github.com/sockjs/sockjs-client[SockJS website],
   but in summary you use it something like this:
   
  +[source,js]
   ----
   var sock = new SockJS('http://mydomain.com/myapp');
   
  
positive.code: 
  [source,html]
  ----
  <script src="https://cdn.jsdelivr.net/npm/sockjs-client@1/dist/sockjs.min.js"></script>
  <script src='vertx-eventbus.js'></script>
  
  <script>
  
  
negative.code: {@link examples.WebExamples#example45}
  ----
  
  In client side JavaScript you use the http://npmjs.com/package/@vertx/eventbus-bridge-client.js[@vertx/eventbus-bridge-client.js]
  library to create connections to the event bus and to send and receive messages. The library is available on http://npmjs.com/package/@vertx/eventbus-bridge-client.js[NPM]
  so it can easily be used with bundlers or build tools, but in can easily be used from a CDN (like the sockJS example
  before):
  
  [source,html]
  ----
  <script src="https://unpkg.io/sockjs-client@1.5.0/dist/sockjs.min.js"></script>
  <script src='https://unpkg.io/@vertx/eventbus-bridge-client.js@1.0.0-1/vertx-eventbus.js'></script>
  
  <script>
  
  var eb = new EventBus('http://localhost:8080/eventbus');
  
  eb.onopen = () => {
  
    // set a handler to receive a message
    eb.registerHandler('some-address', (error, message) => {
      console.log('received a message: ' + JSON.stringify(message));
    });
  
  