title: Wicket - Apache URL rewrite Access-Control-Allow-Origin issue
body: <p>I'm facing a strange issue. I'm on UserPage on <a href="http://account.dev.pippo.com/account/UserPage" rel="nofollow">http://account.dev.pippo.com/account/UserPage</a> in this page I have a DropDown component to filter a listview (using Ajax). 
  When choosing a value from the dropdown the XMLHttpRequest is done against <a href="http://dev.pippo.com" rel="nofollow">http://dev.pippo.com</a> instead of <a href="http://account.dev.pippo.com/account" rel="nofollow">http://account.dev.pippo.com/account</a>. This leads to an Access-Control-Allow-Origin problem:</p>
  
  <pre><code>XMLHttpRequest cannot load https://dev.pippo.com/wicket/page?3-1.IBehaviorListener.0-c…ontentList-layout-contentRight-overview-dateRange-listViewDateRangeOptions. Origin https://account.dev.pippo.com is not allowed by Access-Control-Allow-Origin. 
  </code></pre>
  
  <p>I have an Apache rewrite rule that prepend the account. URL when /account is used.</p>
  
  <p>The /account URL is mounted using:</p>
  
  <pre><code>mountPackage("/account", UserPage.class);
  </code></pre>
  
  <p>(I moved all panels and custom components used by this Page on the same package)</p>
  
  <p>Should't wicket use the current URL (<a href="http://account.dev.pippo.com" rel="nofollow">http://account.dev.pippo.com</a>) as target for the Ajax request (to avoid browser blocking the requests)?</p>
  
  <p>Why is this happening? Is this a wicket bug? </p>
  
  <p>I'm using Apache Wicket 6.9.1.</p>
  
  <p>Thanks a lot.</p>
  
  <p>EDIT:
  In the markup file I have the following AJAX request</p>
  
  <pre><code>Wicket.Ajax.ajax({"u":"../wicket/page?3-1.IBehaviorListener.0-content-contentList-layout-contentRight-overview-dateRange-listViewDateRangeOptions","e":"change","c":"listViewDateRangeOptions13","ad":true,"m":"POST"});;
  </code></pre>