https://spring.io/guides/gs/consuming-rest/
https://cloud.spring.io/spring-cloud-static/Greenwich.SR2/multi/multi_spring-cloud-feign.html
https://www.jianshu.com/p/3d597e9d2d67
https://spring.io/guides/gs/consuming-rest/
https://cloud.spring.io/spring-cloud-static/Greenwich.SR2/multi/multi_spring-cloud-feign.html
https://www.jianshu.com/p/3d597e9d2d67