{"id":2869,"date":"2022-04-18T22:39:08","date_gmt":"2022-04-18T13:39:08","guid":{"rendered":"http:\/\/blog.xcir.net\/?p=2869"},"modified":"2022-04-18T22:45:28","modified_gmt":"2022-04-18T13:45:28","slug":"%e5%bc%b7%e3%81%84%e3%82%ad%e3%83%a3%e3%83%83%e3%82%b7%e3%83%a5-%e5%bc%b1%e3%81%84%e3%82%ad%e3%83%a3%e3%83%83%e3%82%b7%e3%83%a5%e3%81%a8%e3%81%af%e3%81%aa%e3%81%ab%e3%81%8b","status":"publish","type":"post","link":"http:\/\/blog.xcir.net\/?p=2869","title":{"rendered":"\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5 \u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u306f\u306a\u306b\u304b"},"content":{"rendered":"\n<p>\u5148\u65e5<a rel=\"noreferrer noopener\" href=\"https:\/\/yumenosora.connpass.com\/event\/241175\/presentation\/\" target=\"_blank\">\u3068\u3089\u306e\u3042\u306a\u30e9\u30dc\u69d8\u306e\u52c9\u5f37\u4f1a<\/a>\u306b\u53c2\u52a0\u3057\u3066\u3044\u305f\u3068\u3053\u308d\u300c\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u300d\u300c\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u300d\u3068\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u51fa\u3066\u304d\u307e\u3057\u305f\u3002<br>\u521d\u3081\u3066\u805e\u304f\u8868\u73fe\u3060\u3063\u305f\u306e\u3067\u8cea\u554f\u3057\u305f\u3068\u3053\u308d\u3084\u306f\u308a\u77e5\u3089\u306a\u3044\u5b9a\u7fa9\u3060\u3063\u305f\u305f\u3081\u3001\u5c11\u3057\u8abf\u3079\u3066\u307e\u3068\u3081\u3066\u307f\u305f\u3082\u306e\u3067\u3059\u3002<br>\u306a\u304a\u3001\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u3044\u3046\u8aac\u660e\u3092\u5426\u5b9a\u3059\u308b\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u88dc\u5b8c\u3057\u305f\u3044\u3068\u8003\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5b9a\u7fa9<\/h2>\n\n\n\n<p>\u30cd\u30c3\u30c8\u4e0a\u3092\u8abf\u3079\u308b\u3068\u65e5\u672c\u8a9e\u30fb\u4e2d\u56fd\u8a9e\u30fb\u82f1\u8a9e\u3067\u8aac\u660e\u304c\u51fa\u3066\u304d\u307e\u3059\u304c\u3001\u8abf\u3079\u305f\u9650\u308a\u3067\u306f\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u521d\u51fa\u306f<a href=\"https:\/\/www.amazon.co.jp\/dp\/B0728K5JZV?_encoding=UTF8&amp;btkr=1&amp;linkCode=ll1&amp;tag=yellowtail00-22&amp;linkId=01a6ac379651bb9b630aa9a21b8c0373&amp;language=ja_JP&amp;ref_=as_li_ss_tl\">Web\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9 \u30cf\u30a4\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/a>\u3067\u3001\u5b9a\u7fa9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Expires\u30d8\u30c3\u30c0\u30fc\u3068Cache-Control\u30d8\u30c3\u30c0\u30fc\u3067\u306f\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<br>ETag\u30d8\u30c3\u30c0\u30fc\u3068Last-Modified\u30d8\u30c3\u30c0\u30fc\u3067\u306f\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p><cite><a href=\"https:\/\/www.amazon.co.jp\/dp\/B0728K5JZV?_encoding=UTF8&amp;btkr=1&amp;linkCode=ll1&amp;tag=yellowtail00-22&amp;linkId=01a6ac379651bb9b630aa9a21b8c0373&amp;language=ja_JP&amp;ref_=as_li_ss_tl\">Web\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9 \u30cf\u30a4\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/a> p124<\/cite><\/blockquote>\n\n\n\n<p>\u3053\u3061\u3089\u306e\u6587\u66f8\u306e\u524d\u5f8c\u306b\u8a73\u3057\u3044\u5b9a\u7fa9\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u8981\u7d04\u3059\u308b\u3068<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u660e\u793a\u7684\u306bTTL\u3092\u8a2d\u5b9a<sub>Cache-Control: max-age \/ Expires<\/sub>\u3059\u308b\u3053\u3068\u3067\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u5229\u7528\u6642\u306b\u30aa\u30ea\u30b8\u30f3\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u98db\u3070\u306a\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5<\/li><li>\u30ad\u30e3\u30c3\u30b7\u30e5\u5229\u7528\u6642\u306b\u30aa\u30ea\u30b8\u30f3\u306b\u6761\u4ef6\u4ed8\u304d\u554f\u3044\u5408\u308f\u305b\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308b\u3082\u306e\u3092\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5<\/li><\/ul>\n\n\n\n<p>\u3067\u3001\u8457\u8005\u306b\u8cea\u554f\u3092\u3057\u305f\u3068\u3053\u308d<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u6761\u4ef6\u4ed8\u304d\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u691c\u8a3c\u304c\u5fc5\u8981\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5<\/li><li>\u305d\u308c\u4ee5\u5916\u306f\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5<\/li><\/ul>\n\n\n\n<p>\u3067\u3001\u307e\u305f\u3053\u306e\u300c\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u300d\u306f\u672c\u66f8\u3067\u4fbf\u5b9c\u7684\u306b\u3064\u3051\u305f\u540d\u524d\u3067RFC\u306a\u3069\u306b\u306f\u5b9a\u7fa9\u306f\u306a\u3044\u3068\u601d\u3046\u3068\u306e\u3053\u3068\u3067\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u691c\u8a3c\u304c\u5fc5\u8981\u306a\u3082\u306e\u3092\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u305d\u308c\u4ee5\u5916\u306f\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u547c\u3076\u306e\u306f<br>\u76f4\u89b3\u7684\u3067\u308f\u304b\u308a\u3084\u3059\u3044\u306a\u3068\u306f\u601d\u3046\u306e\u3067\u3059\u304c\u3001\u3088\u308a\u8a73\u3057\u304f\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u3064\u3044\u3066\u77e5\u308d\u3046\u3068\u601d\u3063\u305f\u5834\u5408\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u4ed5\u69d8(RFC7234)\u304a\u3051\u308b\u6982\u5ff5\u3068\u3069\u3046\u7d10\u3065\u3051\u308c\u3070\u3044\u3044\u306e\u304b\u3068\u3044\u3046\u306e\u3092\u8aac\u660e\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30ad\u30e3\u30c3\u30b7\u30e5\u306eRFC\u306b\u306f\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u3044\u3046\u8868\u73fe\u306f\u306a\u3044<\/h2>\n\n\n\n<p>\u8457\u8005\u306e\u56de\u7b54\u901a\u308a\u306a\u306e\u3067\u3059\u304c <a rel=\"noreferrer noopener\" href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc7234\" target=\"_blank\">RFC7234 Caching<\/a> <a rel=\"noreferrer noopener\" href=\"https:\/\/lists.w3.org\/Archives\/Public\/ietf-http-wg\/2022JanMar\/0234.html\" data-type=\"URL\" data-id=\"https:\/\/lists.w3.org\/Archives\/Public\/ietf-http-wg\/2022JanMar\/0234.html\" target=\"_blank\"><sub>\u305d\u308d\u3063\u3068\u65b0\u3057\u3044RFC\u51fa\u308b\u3068\u601d\u3044\u307e\u3059\u304c<\/sub><\/a>\u306b\u304a\u3044\u3066\u306f\u5f37\u3044<sub>Strong<\/sub>\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u5f31\u3044<sub>Weak<\/sub>\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u3044\u3046\u8868\u73fe\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>Strong\/Weak\u306e\u8868\u73fe\u304c\u3042\u308b\u306e\u306f\u691c\u8a3c\u5b50<sub>Validator<\/sub>\u3067\u3001\u4eca\u56de\u306e\u672c\u7b4b\u3067\u306f\u306a\u3044\u306e\u3067\u8a73\u3057\u304f\u306f\u8aac\u660e\u3057\u307e\u305b\u3093\u304c\u4e00\u822c\u7684\u306b\u306fLast-Modified\u3068ETag\u3092\u6307\u3057\u307e\u3059\u3002<sub><a rel=\"noreferrer noopener\" href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc7232#section-2\" target=\"_blank\">RFC7232#2<\/a><\/sub><\/p>\n\n\n\n<p>ETag\u3092\u898b\u3066\u3044\u308b\u3068\u300cetag: W\/&#8221;6226c295-200f3&#8243;\u300d\u306e\u3088\u3046\u306bW\/\u304b\u3089\u59cb\u307e\u308b\u3082\u306e\u3068\u300cetag: &#8220;6226c295-200f3&#8243;\u300dW\/\u304c\u3064\u3044\u3066\u3044\u306a\u3044\u3082\u306e\u304c\u3042\u308b\u3053\u3068\u306b\u6c17\u3065\u304f\u3068\u601d\u3044\u307e\u3059\u3002\u3064\u3044\u3066\u308b\u3068\u5f31\u3044\u691c\u8a3c\u5b50\u3067\u3059\u3002(<strong>W<\/strong>eak validator)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u306eRFC\u3067\u8a00\u3046\u3068\u3053\u308d\u306e\u306a\u3093\u306a\u306e\u304b<\/h2>\n\n\n\n<p>\u307e\u305a\u306f\uff08HTTP\uff09\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u52d5\u304d\u306b\u3064\u3044\u3066\u3061\u3087\u3063\u3068\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u30b5\u30a4\u30c8\u3067CSS\u306a\u3069\u306e\u9759\u7684\u30ea\u30bd\u30fc\u30b9\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u305f\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u30011\u65e5\u306eTTL\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u30b1\u30fc\u30b9\u3067\u30aa\u30ea\u30b8\u30f3\u304b\u3089\u30ec\u30b9\u30dd\u30f3\u30b9\u3055\u308c\u308b\u30d8\u30c3\u30c0\u306b\u542b\u307e\u308c\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u95a2\u308f\u308b\u30d8\u30c3\u30c0\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3068\u3057\u307e\u3059<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Cache-Control: max-age=86400<\/li><li>ETag\u30d8\u30c3\u30c0<\/li><li>Last-Modified\u30d8\u30c3\u30c0<\/li><\/ul>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306a\u30d8\u30c3\u30c0\u3067\u3042\u308c\u3070\u3001\u30b5\u30a4\u30c8\u3078\u306e\u521d\u56de\u8a2a\u554f\u6642\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3001\u5c11\u306a\u304f\u3068\u3082\u305d\u306e\u65e5\u306b\u30b5\u30a4\u30c8\u3092\u56de\u904a\u3057\u3066\u308b\u9593\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u5229\u7528\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u305d\u3057\u3066\u3001\u6570\u65e5\u305f\u3063\u3066\u304b\u3089\u305d\u306e\u30b5\u30a4\u30c8\u306b\u518d\u8a2a\u3057\u305f\u6642\u306b\u306f\u5f53\u7136TTL\u306f\u5207\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3067\u3059\u304c\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u3044\u3046\u3082\u306e\u306fTTL\u304c\u5207\u308c\u305f\u304b\u3089\u3068\u3044\u3063\u3066\u4f7f\u3044\u9053\u304c\u306a\u304f\u306a\u3063\u3066\u5373\u6642\u3067\u6d88\u3048\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>TTL\u304c\u5207\u308c\u3066\u306f\u3044\u308b\u3082\u306e\u306e\u3001\u305d\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u6700\u65b0\u306e\u3082\u306e\u3068\u540c\u4e00\u3067\u3042\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u308c\u3070\u518d\u5229\u7528\u3067\u304d\u307e\u3059\u3002<br>\u3053\u306e\u518d\u5229\u7528\u3092\u884c\u3046\u305f\u3081\u306b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30aa\u30ea\u30b8\u30f3\u306b\u5bfe\u3057\u3066\u884c\u3046\u306e\u304c\u6761\u4ef6\u4ed8\u304d\u30ea\u30af\u30a8\u30b9\u30c8<sub>If-None-Match\u306a\u3069<\/sub>\u3067\u3059\u3002<br>\u3053\u306e\u6642\u306b\u6700\u65b0\u306e\u3082\u306e\u3068\u540c\u4e00\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u306e\u306b\u4f7f\u3046\u306e\u304c\u691c\u8a3c\u5b50\u3067ETag\/Last-Modified\u3067\u3059\u3002<br>\u8981\u306f\u4eca\u6301\u3063\u3066\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3053\u306e\u691c\u8a3c\u5b50\u3060\u3051\u3069\u3001\u6700\u65b0\u306e\u691c\u8a3c\u5b50\u3068\u4e00\u81f4\u3057\u3066\u308b\uff1f\u3068\u805e\u3044\u3066\u308b\u308f\u3051\u3067\u3059\u3002<br>\u3082\u3057\u691c\u8a3c\u5b50\u304c\u4e00\u81f4\u3057\u306a\u3044\u306e\u3067\u3042\u308c\u3070\u30aa\u30ea\u30b8\u30f3\u306f200\u3092\u8fd4\u5374\u3057\u3001\u540c\u6642\u306b\u672c\u6587\u3092\u8fd4\u3057\u307e\u3059\u3002<br>\u4e00\u81f4\u3057\u3066\u3044\u308c\u3070304\u3092\u8fd4\u3057\u3001\u672c\u6587\u306f\u8fd4\u3057\u307e\u305b\u3093\u3002\u672c\u6587\u306e\u8ee2\u9001\u304c\u767a\u751f\u3057\u306a\u3044\u5206\u4f4e\u30b3\u30b9\u30c8\u306a\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"has-small-font-size\">\u3082\u3061\u308d\u3093\u6761\u4ef6\u4ed8\u304d\u30ea\u30af\u30a8\u30b9\u30c8\u306f\u3053\u306e\u52d5\u4f5c\u3092\u3059\u308b\u3082\u306e\u304c\u3059\u3079\u3066\u3067\u306f\u306a\u3044(If-Match\u306a\u3069)\u306e\u3067\u3059\u304c\u3001\u30d6\u30e9\u30a6\u30b6\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u66f4\u65b0\u3067\u4f7f\u3046If-Modified-Since\/If-None-Match\u306f\u3053\u306e\u52d5\u304d\u3092\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u822c\u7684\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u3056\u3063\u304f\u308a\u3068\u3057\u305f\u52d5\u304d\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u3059\u304c\u3001\u3053\u308c\u3092\u5f37\u3044\u30fb\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u8868\u73fe\u3067\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>TTL\u671f\u9593\u4e2d\u306f\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3067\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3067TTL\u304c\u5207\u308c\u3066\u3044\u308c\u3070\u691c\u8a3c\u304c\u5fc5\u8981\u306a\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5<\/li><li>\u691c\u8a3c\u3092\u884c\u3044TTL\u304c\u5ef6\u9577\u3055\u308c\u308c\u3070\u307e\u305f\u3057\u3070\u3089\u304f\u306f\u691c\u8a3c\u304c\u4e0d\u8981\u3068\u306a\u308b\u305f\u3081\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u306a\u308b\u3002<\/li><\/ul>\n\n\n\n<p>\u304a\u305d\u3089\u304f\u3053\u3093\u306a\u611f\u3058\u306e\u8aac\u660e\u304c\u3067\u304d\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6b21\u306bRFC7234\u306b\u304a\u3051\u308b\u8868\u73fe\u3067\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>RFC7234\u3067\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u72b6\u614b\u306fFresh(\u65b0\u9bae)\u3068Stale(\u9673\u8150\u5316\u3057\u3066\u308b)\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u308c\u305e\u308c<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>TTL\u304c\u5207\u308c\u3066\u3044\u306a\u3044\uff1dFresh<\/li><li>TTL\u304c\u5207\u308c\u3066\u3044\u308b\uff1dStale<\/li><\/ul>\n\n\n\n<p>\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u306a\u304a\u3001Fresh\u306e\u5834\u5408\u306f\u5fc5\u305a\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u4f7f\u308f\u308c\u308b\u304b\u3068\u3044\u3046\u3068\u305d\u3046\u3067\u3082\u306a\u304f\u3001\u307e\u305fStale\u3060\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u4f7f\u308f\u308c\u306a\u3044\u304b\u3068\u3044\u3046\u3068\u305d\u3046\u3067\u3082\u306a\u3044\u306e\u304c\u5384\u4ecb\u306a\u3068\u3053\u308d\u3067\u3059\u3002<a rel=\"noreferrer noopener\" href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc7234#section-4\" target=\"_blank\"><sub>RFC7324#4<\/sub><\/a><\/p>\n\n\n\n<p>\u683c\u7d0d\u3057\u3066\u3044\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u3048\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u4e00\u3064\u306e\u6761\u4ef6\u306bFresh\u304c\u3042\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u30aa\u30ea\u30b8\u30f3\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u884c\u3063\u305f\u30bb\u30c3\u30b7\u30e7\u30f3\u3067\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306fFresh\u306a\u306e\u304b\u3068\u3044\u3046\u3068\u96e3\u3057\u3044\u3067\u3059\u3002<br>\u305d\u3082\u305d\u3082\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30aa\u30ea\u30b8\u30f3\u304b\u3089\u6301\u3063\u3066\u304d\u305f\u3082\u306e\u3067\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u6301\u3063\u3066\u304d\u305f\u308f\u3051\u3067\u306f\u306a\u3044<sub>\u3080\u3057\u308d\u69d8\u3005\u306a\u6761\u4ef6\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b<\/sub>\u306e\u3067\u5225\u67a0\u3068\u8003\u3048\u308b\u306e\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<sub>\uff08\u305d\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u307f\u3067\u306fFresh\u3068\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u304c\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u3063\u3066\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u3061\u3087\u3063\u3068\u9055\u548c\u611f\u304c\u3042\u308b\uff09<\/sub><\/p>\n\n\n\n<p>\u3053\u308c\u3089\u3092\u8e0f\u307e\u3048\u3066\u540c\u3058\u3088\u3046\u306b\u8aac\u660e\u3059\u308b\u3068<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>TTL\u671f\u9593\u4e2d\u306fFresh\u3067\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3067TTL\u304c\u5207\u308c\u3066\u3044\u308c\u3070\u691c\u8a3c\u304c\u5fc5\u8981\u306aStale<\/li><li>\u691c\u8a3c\u3092\u884c\u3044TTL\u304c\u5ef6\u9577\u3055\u308c\u308c\u3070\u307e\u305f\u3057\u3070\u3089\u304f\u306f\u691c\u8a3c\u304c\u4e0d\u8981\u3068\u306a\u308b\u305f\u3081Fresh\u3068\u306a\u308b\u3002<\/li><\/ul>\n\n\n\n<p>\u82e5\u5e72\u5148\u307b\u3069\u306b\u3042\u308f\u305b\u308b\u305f\u3081\u306b\u5f37\u5f15\u306a\u8aac\u660e<sub>\u6b63\u78ba\u3067\u306a\u3044<\/sub>\u306b\u306f\u306a\u3063\u3066\u307e\u3059\u304c\u3001\u3060\u3044\u305f\u3044\u3053\u3093\u306a\u611f\u3058\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3064\u307e\u308a\u3001\u5f37\u3044\u30fb\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u306fFresh\u30fbStale\u306e\u95a2\u4fc2\u306b\u8fd1\u3044\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3082\u3061\u308d\u3093\u53b3\u5bc6\u306b\u3044\u3046\u3068\u7570\u306a\u308a\u307e\u3059\u3002<br>\u30cf\u30a4\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u672c\u306e\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5b9a\u7fa9\u306b\u306f\u300cCache-Control\u306emax-age\u3084Expires\u3067\u660e\u793a\u7684\u306bTTL\u3092\u6307\u5b9a\u3059\u308b\u300d\u3068\u3042\u308a\u307e\u3059\u304c\u3001TTL\u306f\u3053\u308c\u3089\u30d8\u30c3\u30c0\u304c\u672a\u6307\u5b9a\u3067\u3082Date\u3068Last-Modified\u30d8\u30c3\u30c0\u304c\u3042\u308c\u3070\u6709\u52b9\u306b\u306a\u308b\u30d2\u30e5\u30fc\u30ea\u30b9\u30c6\u30a3\u30c3\u30af\u306aTTL\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<sub><a rel=\"noreferrer noopener\" href=\"http:\/\/blog.xcir.net\/?p=2806\" data-type=\"post\" data-id=\"2806\" target=\"_blank\">HTTP\u30ad\u30e3\u30c3\u30b7\u30e5\u5165\u9580\u306e\u5165\u9580<\/a>\u53c2\u7167<\/sub><\/p>\n\n\n\n<p>\u3044\u3046\u306a\u3089\u3070\u300c\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u300d\u306f\u300cFresh\u300d\u306b\u542b\u307e\u308c\u308b\u3067\u3057\u3087\u3046\u304b<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u76f8\u53cd\u3059\u308b\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u4eca\u56de\u306e\u4f8b\u306e\u3088\u3046\u306b\u660e\u793a\u7684\u306bTTL\u3092\u6307\u5b9a\u3057\u3064\u3064\uff08\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\uff09\u3001Etag\u3092\u6307\u5b9a\uff08\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\uff09\u3059\u308b\u3053\u3068\u3067TTL\u5207\u308c\u306e\u6642\u306b\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u3057\u3066\u52d5\u4f5c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u3053\u307e\u3067\u3067\u3001\u5f37\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u5f31\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u30d9\u30fc\u30b9\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u4ed5\u69d8\u3092\u8aad\u3080\u969b\u306e\u3068\u3063\u304b\u304b\u308a\u90e8\u5206\u304c\u3067\u304d\u305f\u304b\u306a\u3068\u601d\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3088\u308a\u8a73\u3057\u304f\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u77e5\u308a\u305f\u3044\u6642\u306b\u6ce8\u610f\u3057\u3066\u304a\u304d\u305f\u3044\u3068\u3053\u308d<\/h2>\n\n\n\n<p>\u57fa\u672c\u7684\u306b\u306f\u4ee5\u524d\u66f8\u3044\u305f<a rel=\"noreferrer noopener\" href=\"http:\/\/blog.xcir.net\/?p=2806\" data-type=\"post\" data-id=\"2806\" target=\"_blank\">HTTP\u30ad\u30e3\u30c3\u30b7\u30e5\u5165\u9580\u306e\u5165\u9580<\/a>\u3084\u81ea\u8457\u306e<a href=\"https:\/\/amzn.to\/37ZNNIv\" target=\"_blank\" rel=\"noreferrer noopener\">Web\u914d\u4fe1\u306e\u6280\u8853<\/a>\u3092\u8aad\u3093\u3067\u307b\u3057\u3044\u306e\u3067\u3059\u304c<sub>(\u4eca\u56de\u306e\u5185\u5bb9\u306f\u5168\u90e83\u7ae0\u306b\u3042\u308a\u307e\u3059)<\/sub><br>\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u3044\u3046\u306e\u306f\u6642\u9593\u7d4c\u904e\u3067\u72b6\u614b\u304c\u304b\u308f\u308b\uff08TTL\u304c\u3042\u308b\uff09\u306e\u3067\u5fc5\u305a\u3057\u3082\u683c\u7d0d\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u306f\u305d\u308c\u304cFresh\u3068\u3082Stale\u306e\u3069\u3061\u3089\u304b\u3068\u3044\u3063\u305f\u3053\u3068\u306f\u308f\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u3058\u3083\u3041\u3069\u3053\u3067\u308f\u304b\u308b\u306e\u304b\u3068\u3044\u3046\u3068\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u5229\u7528\u3059\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized is-style-default\"><a 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