title: Purpose of ClientSettingsProvider.ServiceUri in app.config
body: <p>What does</p>
  
  <pre><code>&lt;appSettings&gt;
      &lt;add key="ClientSettingsProvider.ServiceUri" value=""/&gt;
  &lt;/appSettings&gt;
  </code></pre>
  
  <p>do?</p>
  
  <p>Since the value is empty string, can I remove the element?</p>