title: how to subscribe to eventstream - serverside
body: <p>I have a url that return <code>text/event-stream</code> data so I am trying to connect and print everything I find:</p>
  
  <pre><code>var url = "..."
  var source = new EventSource(url);
  
  source.addEventListener('message', function(e) { 
      console.log(e.data);
  }, false);
  
  source.addEventListener('open', function(e) { }, false);
  
  source.addEventListener('error', function(e) {
      if (e.readyState == EventSource.CLOSED) {  }
  }, false);
  </code></pre>
  
  <p>unfortunately this doesn't work serverside.  can I connect this way?</p>
  
  <pre><code>$ node app.js
  
  app.js:2
  var source = new EventSource(url);
                   ^
  
  ReferenceError: EventSource is not defined
      at Object.&lt;anonymous&gt; (app.js:2:18)
      at Module._compile (module.js:409:26)
      at Object.Module._extensions..js (module.js:416:10)
      at Module.load (module.js:343:32)
      at Function.Module._load (module.js:300:12)
      at Function.Module.runMain (module.js:441:10)
      at startup (node.js:139:18)
      at node.js:968:3
  </code></pre>