백엔드 커리큘럼 심화: HTTP 캐싱·ETag·재검증(Revalidation) 운영 플레이북
캐시 적중률 숫자만 보는 단계를 넘어, Cache-Control/ETag/재검증 정책을 서비스 위험도와 데이터 신선도 기준으로 설계하는 실무 플레이북입니다.
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