title: Grails URL mapping cause error on GSP
body: <p>I have a site that have URL similar to this:</p>
  
  <pre><code>/mysite/admin/controller/action/id
  /mysite/search/controller/action/id
  /mysite/user/controller/action/id
  </code></pre>
  
  <p>I have my URL mapping like this</p>
  
  <pre><code>"/$prefix/$controller/$action?/$id?"{
      constraints {}
  }
  </code></pre>
  
  <p>I am able to get to the controller correctly.</p>
  
  <p>But on the GSP side</p>
  
  <pre><code>&lt;g:link controller="controller"&gt;abc&lt;/g:link&gt; ==&gt; &lt;a href="/mysite/controller/..."&gt;abc&lt;/a&gt;
  </code></pre>
  
  <p>Notice how I lose the prefix between mysite and the controller.</p>