API 설계 https://velog.io/@city7310/%EB%B0%B1%EC%97%94%EB%93%9C%EA%B0%80-%EC%9D%B4%EC%A0%95%EB%8F%84%EB%8A%94-%ED%95%B4%EC%A4%98%EC%95%BC-%ED%95%A8-6.-API-%EC%8A%A4%ED%8E%99-%EC%84%A4%EA%B3%84%EC%99%80-%EB%AC%B8%EC%84%9C%ED%99%94-%EB%B0%A9%EC%8B%9D-%EA%B2%B0%EC%A0%95-2