Builds url for fetching the files from FM.

def _buildFileUrl(self, xml_req):
		"""Builds url for fetching the files from FM."""
		return '%(protocol)s://%(host)s:%(port)s%(xml_req)s'%{
			'protocol': self._protocol,
			'host': self._host,
			'port': self._port,
			'xml_req': xml_req,
		}