#routeRule:
#  ShoppingCart:        #service name
#    - precedence: 2    #precedence of route rule
#      route:           #route rule list
#      - tags:
#          version: 0.2 
#          app: HelloWorld 
#        weight: 80     #weight of 80%
#      - tags:
#          version: 1.2
#          app: HelloWorld
#        weight: 20     #weight of 20%