title: how to get static files in Flask without url_for('static', file_name='xxx')
body: <p>I don't want use  url_for('static', file_name='foo.jpg') to get static file in template. </p>
  
  <p>how to get static file in this way:</p>
  
  <pre><code>&lt;img src="/pic/foo.jpg" /&gt;
  </code></pre>
  
  <p>thanks</p>