def _retrieve(self):
url = "<STR_LIT>" % (self._proto, self._host, self._port)<EOL>params = {}<EOL>params['<STR_LIT>'] = '<STR_LIT:true>'<EOL>response = util.get_url(url, self._user, self._password, params)<EOL>tree = ElementTree.XML(response)<EOL>return tree<EOL>
Query Apache Tomcat Server Status Page in XML format and return 
        the result as an ElementTree object.

        @return: ElementTree object of Status Page XML.