title: How to get token from facebook login [UWP]
body: <p>I have an app that open a <code>webview</code> and let users sign in. </p>
  
  <p>I'm trying to get the access token from the <code>baseUrl</code> but the access token disappeared after view moments in the link <code>access_token=</code> and show me another page have a not secure connection so I can't take it ...
  here's my code</p>
  
  <pre><code>            DataPackage dataPackage = new DataPackage();
              string r3 = page.Source.AbsoluteUri;
              string ntoken = r3.Substring(r3.IndexOf("access_token") + 13);
              string token = ntoken.Substring(0, ntoken.IndexOf("&amp;"));
  </code></pre>
  
  <p>anyone can help me !</p>