May 2022
Beginner to intermediate
756 pages
21h 30m
Korean
book
HTTP 완벽 가이드
by David Gourlry, Brian Totty, Lee Eung Jun, Sang -Il Jeong, Anshu Agarwal, Seilu Reddy, Marjorie Sayre
Content preview from HTTP 완벽 가이드
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419
15
장 엔터티와 인코딩
The Definitive Guide
는 경우가 있다. 예를 들어 서버는 크고 자주 찾는 캐시된 문서에 대해, 캐시의 재
검사로 인한 대량 전송을 유발하지 않으면서 겉모양새만 약간 고치고 싶을 수도 있
다. 이 경우, 서버는 태그 앞에 ‘W/’를 붙임으로써 ‘약한’ 엔터티 태그임을 알린다.
약한 엔터티 태그는 엔터티의 의미상 두드러진 변화에만 사용할 수 있다. 강한 엔
터티 태그는 관련된 엔터티 값이 아무리 사소하게 바뀌었더라도 함께 변경되어야
한다.
다음의 예는 어떻게 클라이언트가 약한 엔터티 태그를 사용해서 서버와 재검사
를 하는지 보여준다. 서버는 콘텐츠가 문서 버전 4.0 이후로 의미 있는 변경이 있었
을 때만 본문을 반환할 것이다.
GET /announce.html HTTP/1.1
If-None-Match: W/"v4.0"
요약하면, 클라이언트가 같은 리소스에 한 번 이상 접근했을 때, 우선 현재 사본이
여전히 신선한지 판별한다. 만약 그렇지 않다면, 클라이언트는 반드시 서버로부터
최신 버전을 얻어 와야 한다. 리소스가 변경되지 않은 상황에서 똑같은 사본을 다
시 받아오는 상황을 피하기 위해, 클라이언트는 서버에 현재 사본을 유일하게 식별
할 수 있는 검사기를 명시해서 조건부 요청을 보낼 수 있다. 서버는 오직 클라이언
트의 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.