https://brunch.co.kr/@springboot/202 https://kwonnam.pe.kr/wiki/springframework/feign https://www.vinsguru.com/spring-webclient-with-feign/ https://happycloud-lee.tistory.com/220 https://enjoy-dev.tistory.com/3 https://stackoverflow.com/questions/67191617/springboot-feignclient-vs-webclient
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