code: def _subArgsInRoute(self, entry, args):
          
  
          route = entry['route']
  
          for arg, val in six.iteritems(args):
              toReplace = "<%s>" % arg
              if toReplace not in route:
                  raise exceptions.TaskclusterFailure(
                      'Arg %s not found in route for %s' % (arg, entry['name']))
              val = urllib.parse.quote(str(val).encode("utf-8"), '')
              route = route.replace("<%s>" % arg, val)
  
          return route.lstrip('/')
docs: Given a route like "/task/<taskId>/artifacts" and a mapping like
          {"taskId": "12345"}, return a string like "/task/12345/artifacts"