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there are two spring cloud java project in serve dir which offer same restful api:

• user-service
• auth-service

you can use those to mock below situation

• two service with each one instance
• one service with two instances, just change spring.application.name in auth-service/src/resource/application.properties from auth-service to user-service notice ! change the port if registry center is nacos
• start a new instance or kill the old to mock instance up or down