title: How to get the anchor of url in play's controller
body: <p>Suppose I have a controller and an action:</p>
  
  <pre><code>public Questions extends BaseController {
      public static void show(id) {
          // how to get the anchor here??
      }
  }
  </code></pre>
  
  <p>A url with anchor like <code>http://aaa.com/questions/show?id=123#555</code> will map to this action, and how can we get the anchor <code>555</code> in action <code>show</code>?</p>