https://log.j2234.cc/tags/http/Recent content in Http on j2234's logHugo -- gohugo.ioen© 2026Thu, 02 Apr 2026 14:19:37 +0000https://log.j2234.cc/posts/velog/038-http-header2/Tue, 28 Mar 2023 20:11:55 +0000https://log.j2234.cc/posts/velog/038-http-header2/<p><a href="./HTTP-header" >HTTP Header1</a>에서 이어짐</p> <hr> <h2 class="relative group">검증 헤더1 <div id="검증-헤더1" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%ea%b2%80%ec%a6%9d-%ed%97%a4%eb%8d%941" aria-label="Anchor">#</a> </span> </h2> <p><code>Last-Modified</code>, <code>if-modified-since</code></p> <blockquote><p>캐시 유효 시간이 초과한 경우, 서버의 데이터는 변경되었을 수도 있다.</p> </blockquote><ul> <li>캐시가 만료 후에도 데이터가 변경되지 않았다면, 저장된 캐시 재사용 가능</li> <li>❗️단, <strong>데이터가 같다는 사실을 확인할 방법</strong> 이 필요</li> </ul> <p><code>Last-Modified</code> 헤더를 통해서 이를 확인</p> <p>동작방식</p> <ol> <li>서버에서 <code>Last-Modified</code> 헤더를 전송</li> <li>캐시 시간 초과시, 브라우저가 <code>if-modified-since</code>를 서버에 전송</li> <li>서버에서 판단</li> </ol> <ul> <li>변경안됬으면 <code>304 Not Modified</code> 응답(데이터전송 ❌) =&gt; 캐시 정보 갱신 &amp; 응답 결과 재사용</li> <li>변경됬으면 <code>200</code> 모든 데이터 포함</li> </ul> <hr> <h2 class="relative group">검증 헤더 2 <div id="검증-헤더-2" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%ea%b2%80%ec%a6%9d-%ed%97%a4%eb%8d%94-2" aria-label="Anchor">#</a> </span> </h2> <p><code>Etag</code>, <code>If-None-Match</code></p>https://log.j2234.cc/posts/velog/039-http-header1/Sun, 26 Mar 2023 19:35:18 +0000https://log.j2234.cc/posts/velog/039-http-header1/<h2 class="relative group">Header란? <div id="header란" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#header%eb%9e%80" aria-label="Anchor">#</a> </span> </h2> <blockquote><p>Http 전송에 필요한 모든 부가정보 <a href="https://en.wikipedia.org/wiki/List_of_HTTP_header_fields" target="_blank" rel="noreferrer"><em>엄청많음</em> </a> 필요시 임의의 헤더 추가 가능</p> </blockquote><figure><img class="my-0 rounded-md" loading="lazy" decoding="async" fetchpriority="auto" alt="" width="976" height="458" src="https://log.j2234.cc/posts/velog/039-http-header1/img/image-01_hu_5e99a24764b72488.webp" srcset="https://log.j2234.cc/posts/velog/039-http-header1/img/image-01_hu_5e99a24764b72488.webp 800w, https://log.j2234.cc/posts/velog/039-http-header1/img/image-01.webp 1280w" sizes="(min-width: 768px) 50vw, 65vw" data-zoom-src="https://log.j2234.cc/posts/velog/039-http-header1/img/image-01.webp"></figure> <ul> <li><code>Message body</code>로 데이터를 전달 (payload)</li> <li><code>header</code>는 데이터를 해석할 수 있는 정보 제공 (유형, 길이 &hellip;.)</li> </ul> <p>** 표현 = 표현 메타데이터 + 표현 데이터 **</p> <hr> <h2 class="relative group">표현 (Representation) <div id="표현-representation" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%ed%91%9c%ed%98%84-representation" aria-label="Anchor">#</a> </span> </h2> <blockquote><p>표현 헤더는 전송, 응답 둘다 사용함</p>https://log.j2234.cc/posts/velog/040-http-%EC%83%81%ED%83%9C%EC%BD%94%EB%93%9C/Sun, 26 Mar 2023 19:17:44 +0000https://log.j2234.cc/posts/velog/040-http-%EC%83%81%ED%83%9C%EC%BD%94%EB%93%9C/<ul> <li>1xx : 처리중 (거의 사용 안함)</li> <li>2xx : 정상처리</li> <li>3xx : 추가 행동 필요</li> <li>4xx : 클라이언트 오류</li> <li>5xx : 서버 오류</li> </ul> <p><em>인식할 수 없는 상태코드는 상위상태코드 (ex 299=&gt;2xx)로 해석</em></p> <hr> <h2 class="relative group">2xx 성공👍 <div id="2xx-성공" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#2xx-%ec%84%b1%ea%b3%b5" aria-label="Anchor">#</a> </span> </h2> <ul> <li><code>200</code> <em>OK</em></li> <li><code>201</code> <em>CREATED</em> : (리소스 생성)</li> <li><code>202</code> <em>Accepted</em> : (요청이 접수되었으나, 처리가 완료되지 않음 ) (ex 배치처리)</li> <li><code>204</code> <em>No Content</em> : (서버에서 요청을 수행했지만, 응답 본문에 보낼 데이터는 없음)</li> </ul> <hr> <h2 class="relative group">3xx (Redirection) ▶️▶️ <div id="3xx-redirection-" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#3xx-redirection-" aria-label="Anchor">#</a> </span> </h2> <h3 class="relative group">리다이렉션이란? <div id="리다이렉션이란" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%eb%a6%ac%eb%8b%a4%ec%9d%b4%eb%a0%89%ec%85%98%ec%9d%b4%eb%9e%80" aria-label="Anchor">#</a> </span> </h3> <blockquote><p>웹 브라우저는 3xx 응답에 Location 헤더가 있으면, 자동으로 Location 위치로 이동</p>