title: dojo.io.iframe and download of Excel/PDF
body: <p>I would like to use a Dojo button to download an Excel or a PDF file. So far I've managed to do it by using a call to <code>dojo.io.iframe</code> in the <code>onClick</code> handler of the button. However, this will only download the file once. Any successive calls will be ignored.</p>
  
  <p>This is the call:</p>
  
  <pre><code>function exportToExcel() {
      dojo.io.iframe.send({
          url: '/report/export',
          handleAs: 'xml',
          content: {
              __export: 'excel'
          }
      });
  }
  </code></pre>
  
  <p>As if the <code>dojo.io.iframe</code> does not consider the previous request to be completed.</p>
  
  <p>What am I doing wrong?</p>