title: Javascript - Using window.open() with Basic Authentication
body: <p>When the user logs into my app, he can click on a button to download a CSV file from the server. This URL for the download is protected using basic authentication. When I do this :</p>
  
  <pre><code>window.open('http://url-of-the-csv-file');
  </code></pre>
  
  <p>The browser shows a username/password popup (Basic Authentication)</p>
  
  <p>I want to be able to open the URL without asking the user to enter his password a second time. How do I do that ?</p>