<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _constructUrl(self, route):
 """Construct a URL for the given route on this service, based on the rootUrl"""

        return liburls.api(
            self.options['rootUrl'],
            self.serviceName,
            self.apiVersion,
            route.rstrip('/'))