https://echo724.medium.com/spring%EC%97%90%EC%84%9C-configuration%EA%B3%BC-configurable-%EC%96%B4%EB%85%B8%ED%85%8C%EC%9D%B4%EC%85%98%EC%9D%98-%EC%B0%A8%EC%9D%B4-52d242f193ef