feign-api-test Feign client Sample code json을 리턴하는 공용 API 활용 https://api.androidhive.info/contacts/ https://api.github.com/repos/OpenFeign/feign/contributors 환경 jdk 1.8 gradle spring-cloud-starter-openfeign 상세 annotation 활용 com/example/feightest/client/ADriveFeignClient Builder 활용 com/example/feightest2/client/GitHubClient