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1단계까지는 자력으로 할 수 있었으나,
리팩토링 과정에서 디렉토리를 나누고 파일을 생성하는 것에 어려움을 느껴 브랜치를 참고했습니다.
그런데, 테스트 과정에서 저는 HttpHeaderTest에서 계속 NLE가 발생해서,
HttpHeaders 파일에서 28번째 줄 기존
if (line.equals(""))
에서if (line==null || line.equals(""))
로 변경했더니, 문제가 해결되었습니다.