title: How can I get data from an external URL in jQuery?
body: <p>Consider:</p>
  <pre><code>var resturl = &quot;http://example.com&quot;;
  cj.getJSON(
      resturl + &quot;&amp;callback=?&quot;,        
      function(data)
      {
         console.log(data);
      }
  );
  </code></pre>
  <p>My callback function is never called. Why?</p>