{"id":1086,"date":"2026-10-22T19:00:00","date_gmt":"2026-10-22T10:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1086"},"modified":"2026-10-22T13:10:03","modified_gmt":"2026-10-22T04:10:03","slug":"qs-http-if-match-lost-update-20261022","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1086","title":{"rendered":"HTTP\u306eIf-Match\u3001\u53e4\u3044\u7de8\u96c6\u3067\u65b0\u3057\u3044\u5185\u5bb9\u3092\u4e0a\u66f8\u304d\u3057\u306a\u3044\u4ed5\u7d44\u307f"},"content":{"rendered":"<p>\u4e8c\u4eba\u304c\u540c\u3058\u4e88\u7d04\u60c5\u5831\u3092\u958b\u304d\u3001\u4e00\u4eba\u306f\u4f1a\u8b70\u5ba4\u3092\u3001\u3082\u3046\u4e00\u4eba\u306f\u958b\u59cb\u6642\u523b\u3092\u76f4\u3057\u305f\u3068\u3057\u307e\u3059\u3002\u5f8c\u304b\u3089\u4fdd\u5b58\u3057\u305f\u5185\u5bb9\u304c\u3001\u5148\u306b\u884c\u308f\u308c\u305f\u5909\u66f4\u3092\u5143\u3078\u623b\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u901a\u4fe1\u306b\u6210\u529f\u3057\u3066\u3044\u3066\u3082\u3001\u7de8\u96c6\u306e\u7d50\u679c\u306f\u6b63\u3057\u304f\u6b8b\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>HTTP\u306e<code>If-Match<\/code>\u306f\u3001\u300c\u8aad\u307f\u53d6\u3063\u305f\u3068\u304d\u306e\u72b6\u614b\u3068\u4e00\u81f4\u3059\u308b\u5834\u5408\u3060\u3051\u3001\u3053\u306e\u5909\u66f4\u3092\u9069\u7528\u3057\u3066\u307b\u3057\u3044\u300d\u3068\u6761\u4ef6\u3092\u4ed8\u3051\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u7167\u5408\u306b\u306f<code>ETag<\/code>\u3068\u3044\u3046\u8b58\u5225\u5024\u3092\u4f7f\u3044\u307e\u3059\u3002[1] \u4e8c\u4eba\u306e\u7de8\u96c6\u4f8b\u3092\u901a\u3057\u3066\u3001\u53e4\u3044\u5185\u5bb9\u306b\u3088\u308b\u4e0a\u66f8\u304d\u3092\u3069\u3046\u9632\u304e\u3001\u3069\u3053\u304b\u3089\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5074\u306e\u5224\u65ad\u306b\u306a\u308b\u306e\u304b\u3092\u898b\u307e\u3059\u3002<\/p>\n<section class=\"influvetor-quick-summary\" aria-label=\"\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>\u8aad\u307f\u53d6\u3063\u305f\u8868\u73fe\u306eETag\u3092If-Match\u3078\u4ed8\u3051\u308b\u3068\u3001\u73fe\u5728\u306eETag\u3068\u306e\u4e00\u81f4\u3092\u66f4\u65b0\u6761\u4ef6\u306b\u3067\u304d\u307e\u3059\u3002<\/li>\n<li>\u4f8b\u3067\u306f\u3001\u4e00\u4eba\u76ee\u306e\u66f4\u65b0\u5f8c\u306b\u53e4\u3044ETag\u3067\u4fdd\u5b58\u3057\u3088\u3046\u3068\u3057\u305f\u4e8c\u4eba\u76ee\u3078412\u3092\u8fd4\u3057\u3001\u5148\u306e\u5909\u66f4\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002<\/li>\n<li>\u7af6\u5408\u3092\u898b\u3064\u3051\u308b\u6a5f\u80fd\u3067\u3042\u3063\u3066\u3001\u81ea\u52d5\u3067\u7de8\u96c6\u3092\u7d71\u5408\u3059\u308b\u6a5f\u80fd\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u6700\u65b0\u5185\u5bb9\u3092\u8aad\u307f\u76f4\u3057\u3001\u5909\u66f4\u306e\u610f\u56f3\u3092\u78ba\u8a8d\u3057\u3066\u304b\u3089\u6b21\u306e\u66f4\u65b0\u3092\u7d44\u307f\u7acb\u3066\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>\u4e8c\u4eba\u304c\u540c\u3058\u53e4\u3044\u72b6\u614b\u304b\u3089\u7de8\u96c6\u3059\u308b\u3068<\/h2>\n<p>\u8aac\u660e\u7528\u306e\u30c7\u30fc\u30bf\u3092\u3001\u4f1a\u8b70\u5ba4\u304cA\u3001\u958b\u59cb\u6642\u523b\u304c10\u6642\u306e\u4e88\u7d04\u3068\u3057\u307e\u3059\u3002\u4e8c\u4eba\u3068\u3082\u540c\u3058\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u307e\u3057\u305f\u3002\u7de8\u96c6\u80051\u306f\u4f1a\u8b70\u5ba4\u3092B\u3078\u5909\u3048\u3001\u7de8\u96c6\u80052\u306f\u958b\u59cb\u6642\u523b\u309211\u6642\u3078\u5909\u3048\u307e\u3059\u3002\u3069\u3061\u3089\u3082\u3001\u8aad\u307f\u53d6\u3063\u305f\u30c7\u30fc\u30bf\u5168\u4f53\u3092\u7de8\u96c6\u3057\u3066\u7f6e\u304d\u63db\u3048\u308b\u65b9\u5f0f\u306e\u4fdd\u5b58\u3060\u3068\u3057\u307e\u3059\u3002<\/p>\n<p>\u7de8\u96c6\u80051\u304c\u5148\u306b\u4fdd\u5b58\u3059\u308b\u3068\u3001\u30b5\u30fc\u30d0\u30fc\u4e0a\u306f\u300cB\u30fb10\u6642\u300d\u3067\u3059\u3002\u7d9a\u3044\u3066\u7de8\u96c6\u80052\u304c\u624b\u5143\u306e\u5168\u4f53\u3092\u4fdd\u5b58\u3059\u308b\u3068\u3001\u305d\u306e\u624b\u5143\u306b\u306f\u4f1a\u8b70\u5ba4A\u304c\u6b8b\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u300cA\u30fb11\u6642\u300d\u306b\u306a\u308a\u307e\u3059\u3002\u7de8\u96c6\u80052\u306f\u4f1a\u8b70\u5ba4\u3092\u623b\u3059\u3064\u3082\u308a\u304c\u306a\u304f\u3066\u3082\u3001\u7de8\u96c6\u80051\u306e\u5909\u66f4\u304c\u5931\u308f\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u304c\u3001\u3053\u3053\u3067\u6271\u3046lost update\u3001\u66f4\u65b0\u306e\u6d88\u5931\u3067\u3059\u3002<\/p>\n<p>\u5dee\u5206\u3060\u3051\u3092\u9001\u308b\u65b9\u5f0f\u306a\u3089\u3001\u3053\u306e\u7279\u5b9a\u306e\u4f8b\u3067\u306f\u885d\u7a81\u3092\u907f\u3051\u3089\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u4e8c\u4eba\u304c\u540c\u3058\u9805\u76ee\u3092\u5909\u3048\u308b\u5834\u5408\u3084\u3001\u8907\u6570\u9805\u76ee\u306e\u95a2\u4fc2\u3092\u4fdd\u3064\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u306f\u3001\u305d\u308c\u3060\u3051\u3067\u7af6\u5408\u304c\u306a\u304f\u306a\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u307e\u305a\u300c\u4f55\u3092\u5358\u4f4d\u3068\u3057\u3066\u3001\u3069\u306e\u72b6\u614b\u306b\u5bfe\u3057\u3066\u5909\u66f4\u3057\u305f\u306e\u304b\u300d\u3092\u660e\u78ba\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>ETag\u3092\u66f4\u65b0\u6761\u4ef6\u3068\u3057\u3066\u8fd4\u3059<\/h2>\n<p>ETag\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u8868\u73fe\u3078\u4ed8\u3051\u308b\u8b58\u5225\u5024\u3067\u3059\u3002\u4f8b\u3048\u3070\u8aad\u307f\u53d6\u308a\u5fdc\u7b54\u306b<code>ETag: \"r1\"<\/code>\u304c\u542b\u307e\u308c\u3066\u3044\u305f\u306a\u3089\u3001\u4fdd\u5b58\u8981\u6c42\u3078<code>If-Match: \"r1\"<\/code>\u3092\u4ed8\u3051\u307e\u3059\u3002r1\u3068\u3044\u3046\u6587\u5b57\u5217\u306f\u8aac\u660e\u7528\u3067\u3042\u308a\u3001\u9023\u756a\u3084\u6642\u523b\u3068\u3057\u3066\u89e3\u91c8\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5229\u7528\u5074\u3067\u4e2d\u8eab\u306e\u610f\u5473\u3092\u63a8\u6e2c\u305b\u305a\u3001\u8fd4\u3055\u308c\u305f\u5024\u3092\u6271\u3044\u307e\u3059\u3002[1]<\/p>\n<p>\u4f8b\u3067\u306f\u3001\u7de8\u96c6\u80051\u306e\u4fdd\u5b58\u304c\u6210\u529f\u3059\u308b\u3068\u3001\u30b5\u30fc\u30d0\u30fc\u4e0a\u306e\u5185\u5bb9\u306f\u300cB\u30fb10\u6642\u300d\u3001ETag\u306f&#8221;r2&#8243;\u3078\u5909\u308f\u308a\u307e\u3059\u3002\u7de8\u96c6\u80052\u304c\u53e4\u3044&#8221;r1&#8243;\u3092\u6761\u4ef6\u306b\u4fdd\u5b58\u3057\u3088\u3046\u3068\u3057\u3066\u3082\u3001\u73fe\u5728\u306e&#8221;r2&#8243;\u3068\u306f\u4e00\u81f4\u3057\u307e\u305b\u3093\u3002\u30b5\u30fc\u30d0\u30fc\u306f\u5909\u66f4\u3092\u9069\u7528\u305b\u305a\u3001\u3053\u306e\u4f8b\u3067\u306f<code>412 Precondition Failed<\/code>\u3092\u8fd4\u3057\u307e\u3059\u3002\u300cB\u30fb10\u6642\u300d\u304c\u4fdd\u6301\u3055\u308c\u308b\u306e\u3067\u3001\u4e0a\u66f8\u304d\u306b\u3088\u308b\u5909\u66f4\u306e\u6d88\u5931\u3092\u907f\u3051\u3089\u308c\u307e\u3059\u3002[1]<\/p>\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-http-if-match-lost-update-20261022-figure-2bd26c38250f.png\" style=\"max-width:100%;height:auto\" alt=\"\u540c\u3058\u521d\u671f\u72b6\u614b\u304b\u3089\u4e8c\u4eba\u304c\u4fdd\u5b58\u3059\u308b\u4f8b\u3002\u6761\u4ef6\u306a\u3057\u3067\u306f\u4f1a\u8b70\u5ba4A\u30fb11\u6642\u3068\u306a\u3063\u3066\u4f1a\u8b70\u5ba4B\u3078\u306e\u5909\u66f4\u304c\u6d88\u3048\u308b\u3002If-Match\u3067\u306f\u4e8c\u4eba\u76ee\u306b412\u3092\u8fd4\u3057B\u30fb10\u6642\u3092\u4fdd\u6301\u3002\u8aad\u307f\u76f4\u3057\u3066\u7d71\u5408\u3059\u308b\u3068B\u30fb11\u6642\u3068\u306a\u308b\u3002\"><figcaption>\u72ec\u81ea\u306e\u72b6\u614b\u30e2\u30c7\u30eb\u3067\u4f5c\u3063\u305f\u4f8b\u3002\u5168\u4f53\u7f6e\u63db\u3068\u3001\u6bd4\u8f03\u30fb\u66f4\u65b0\u3092\u4e00\u3064\u306e\u4e0d\u53ef\u5206\u306a\u51e6\u7406\u3068\u3057\u3066\u6271\u3046\u6761\u4ef6\u4ed8\u304d\u7f6e\u63db\u3092\u6bd4\u8f03\u3057\u307e\u3057\u305f\u3002\u5b9f\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u901a\u4fe1\u8a66\u9a13\u3084\u6027\u80fd\u6e2c\u5b9a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/figcaption><\/figure>\n<h2>412\u306e\u5f8c\u306f\u3001\u4f55\u3092\u8aad\u307f\u76f4\u3059\u306e\u304b<\/h2>\n<p>\u7de8\u96c6\u80052\u306f\u3001\u624b\u5143\u306e\u5909\u66f4\u3092\u6368\u3066\u308b\u5fc5\u8981\u304c\u3042\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u307e\u305a\u6700\u65b0\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u3001\u73fe\u5728\u304c\u300cB\u30fb10\u6642\u300d\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u81ea\u5206\u306e\u610f\u56f3\u304c\u958b\u59cb\u6642\u523b\u3060\u3051\u309211\u6642\u3078\u5909\u3048\u308b\u3053\u3068\u306a\u3089\u3001\u305d\u306e\u5909\u66f4\u3092\u6700\u65b0\u30c7\u30fc\u30bf\u3078\u9069\u7528\u3057\u3066\u300cB\u30fb11\u6642\u300d\u3092\u4f5c\u308a\u3001\u4eca\u5ea6\u306f\u8aad\u307f\u76f4\u3057\u305f&#8221;r2&#8243;\u3092\u6761\u4ef6\u3068\u3057\u3066\u4fdd\u5b58\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u9593\u306b\u7b2c\u4e09\u8005\u304c\u66f4\u65b0\u3059\u308c\u3070\u3001\u518d\u3073\u6761\u4ef6\u304c\u4e0d\u4e00\u81f4\u306b\u306a\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u8aad\u307f\u76f4\u3057\u305f\u5024\u3092\u6761\u4ef6\u3068\u3057\u3066\u9001\u308b\u306e\u306f\u3001\u8aad\u307f\u53d6\u308a\u5f8c\u306e\u5909\u66f4\u3082\u898b\u9003\u3055\u306a\u3044\u305f\u3081\u3067\u3059\u3002\u5358\u306b\u53e4\u3044\u672c\u6587\u3092\u305d\u306e\u307e\u307e\u4f7f\u3044\u3001ETag\u3060\u3051\u6700\u65b0\u3078\u5dee\u3057\u66ff\u3048\u308b\u3068\u3001\u4f8b\u3067\u306f\u518d\u3073\u300cA\u30fb11\u6642\u300d\u3067\u4e0a\u66f8\u304d\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u6761\u4ef6\u3092\u901a\u904e\u3055\u305b\u308b\u3053\u3068\u3068\u3001\u7de8\u96c6\u610f\u56f3\u3092\u6b63\u3057\u304f\u7d71\u5408\u3059\u308b\u3053\u3068\u306f\u5225\u3067\u3059\u3002<\/p>\n<p>\u4e8c\u4eba\u3068\u3082\u958b\u59cb\u6642\u523b\u3092\u5909\u3048\u3066\u3044\u305f\u306a\u3089\u3001\u3069\u3061\u3089\u3092\u6b8b\u3059\u304b\u306f\u901a\u4fe1\u898f\u683c\u3060\u3051\u3067\u306f\u6c7a\u307e\u308a\u307e\u305b\u3093\u3002\u5229\u7528\u8005\u306b\u5dee\u5206\u3092\u793a\u3059\u3001\u7de8\u96c6\u6642\u306e\u524d\u63d0\u3092\u78ba\u8a8d\u3059\u308b\u3001\u696d\u52d9\u4e0a\u306e\u512a\u5148\u898f\u5247\u3092\u9069\u7528\u3059\u308b\u3001\u3068\u3044\u3063\u305f\u5224\u65ad\u304c\u5fc5\u8981\u3067\u3059\u3002If-Match\u306f\u3001\u305d\u306e\u5224\u65ad\u3092\u305b\u305a\u306b\u53e4\u3044\u5185\u5bb9\u304c\u5165\u308a\u8fbc\u3080\u306e\u3092\u6b62\u3081\u308b\u305f\u3081\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<h2>\u4f3c\u3066\u3044\u308b\u6761\u4ef6\u3092\u3001\u540c\u3058\u3082\u306e\u3068\u3057\u3066\u6271\u308f\u306a\u3044<\/h2>\n<p>If-Match\u306eETag\u6bd4\u8f03\u306f\u5f37\u3044\u6bd4\u8f03\u3067\u3059\u3002\u4f8b\u3048\u3070<code>W\/\"r1\"<\/code>\u306e\u3088\u3046\u306a\u5f31\u3044ETag\u306f\u3001\u898b\u3048\u3066\u3044\u308b\u6587\u5b57\u5217\u304c\u540c\u3058\u3067\u3082\u3053\u306e\u6bd4\u8f03\u3067\u306f\u4e00\u81f4\u3057\u307e\u305b\u3093\u3002\u307e\u305f<code>If-Match: *<\/code>\u306f\u5bfe\u8c61\u306e\u73fe\u5728\u306e\u8868\u73fe\u304c\u5b58\u5728\u3059\u308b\u304b\u3068\u3044\u3046\u6761\u4ef6\u3067\u3042\u308a\u3001\u8aad\u307f\u53d6\u3063\u305f\u7248\u304b\u3089\u5909\u308f\u3063\u3066\u3044\u306a\u3044\u304b\u306e\u78ba\u8a8d\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002[1]<\/p>\n<p>\u4f8b\u306e\u4e88\u7d04\u304c\u5b58\u5728\u3057\u7d9a\u3051\u308b\u306a\u3089\u3001*\u3067\u306f\u4e00\u4eba\u76ee\u306e\u66f4\u65b0\u524d\u5f8c\u3092\u533a\u5225\u3067\u304d\u307e\u305b\u3093\u3002\u300c\u5b58\u5728\u3057\u3066\u3044\u308c\u3070\u3088\u3044\u300d\u306e\u304b\u3001\u300c\u81ea\u5206\u304c\u8aad\u3093\u3060\u72b6\u614b\u306e\u307e\u307e\u3067\u3042\u3063\u3066\u307b\u3057\u3044\u300d\u306e\u304b\u3092\u5148\u306b\u6c7a\u3081\u308b\u3068\u3001\u6761\u4ef6\u306e\u9078\u3073\u9593\u9055\u3044\u3092\u6e1b\u3089\u305b\u307e\u3059\u3002<\/p>\n<p>\u4fdd\u5b58\u8981\u6c42\u3092\u9001\u3063\u305f\u5f8c\u3001\u5fdc\u7b54\u304c\u9014\u5207\u308c\u308b\u5834\u9762\u3082\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u4fdd\u5b58\u3055\u308c\u306a\u304b\u3063\u305f\u3068\u5373\u65ad\u3057\u3066\u518d\u9001\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u73fe\u5728\u306e\u5185\u5bb9\u3068\u64cd\u4f5c\u306e\u8a18\u9332\u3092\u7167\u5408\u3057\u307e\u3059\u3002RFC 9110\u306f\u3001\u6761\u4ef6\u304c\u4e0d\u4e00\u81f4\u3067\u3082\u3001\u8981\u6c42\u3055\u308c\u305f\u5909\u66f4\u304c\u3059\u3067\u306b\u9069\u7528\u6e08\u307f\u3068\u898b\u3048\u308b\u5834\u5408\u306b\u6210\u529f\u5fdc\u7b54\u3092\u8fd4\u305b\u308b\u4f59\u5730\u3092\u5b9a\u3081\u3066\u3044\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001412\u304c\u8fd4\u3089\u306a\u304b\u3063\u305f\u3053\u3068\u3060\u3051\u3092\u3001\u521d\u56de\u306e\u4e00\u56de\u3067\u65b0\u3057\u304f\u5909\u66f4\u3055\u308c\u305f\u8a3c\u62e0\u306b\u306f\u3067\u304d\u307e\u305b\u3093\u3002[1]<\/p>\n<h2>\u5c0e\u5165\u6642\u306b\u78ba\u304b\u3081\u305f\u3044\u4e09\u3064\u306e\u5883\u754c<\/h2>\n<p>\u307e\u305a\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u6761\u4ef6\u3092\u4ed8\u3051\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u5bfe\u8c61\u306e\u66f4\u65b0\u3067\u305d\u306e\u6761\u4ef6\u3092\u8a55\u4fa1\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u6b21\u306b\u3001\u72b6\u614b\u306e\u6bd4\u8f03\u3068\u66f8\u304d\u8fbc\u307f\u306e\u9593\u3078\u5225\u306e\u66f4\u65b0\u304c\u5272\u308a\u8fbc\u307e\u306a\u3044\u3088\u3046\u3001\u5b9f\u88c5\u4e0a\u306e\u4e0d\u53ef\u5206\u6027\u3092\u78ba\u304b\u3081\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001\u4e0d\u4e00\u81f4\u3084\u5fdc\u7b54\u4e0d\u660e\u306e\u3068\u304d\u3001\u6700\u65b0\u5185\u5bb9\u3068\u5229\u7528\u8005\u306e\u7de8\u96c6\u610f\u56f3\u3092\u3069\u3046\u7167\u5408\u3059\u308b\u304b\u3092\u6c7a\u3081\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306e\u5c0f\u3055\u306a\u30e2\u30c7\u30eb\u306f\u3001\u6761\u4ef6\u306a\u3057\u306e\u4e0a\u66f8\u304d\u3001\u53e4\u3044\u6761\u4ef6\u306e\u62d2\u5426\u3001\u6700\u65b0\u5185\u5bb9\u3078\u610f\u56f3\u3057\u305f\u5909\u66f4\u3060\u3051\u3092\u7d71\u5408\u3059\u308b\u6d41\u308c\u3092\u691c\u67fb\u3057\u305f\u3082\u306e\u3067\u3059\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8d8a\u3057\u306e\u5b9f\u88c5\u304c\u540c\u3058\u4fdd\u8a3c\u3092\u5099\u3048\u308b\u3053\u3068\u307e\u3067\u306f\u793a\u3057\u307e\u305b\u3093\u3002If-Match\u3068\u3044\u3046\u30d8\u30c3\u30c0\u30fc\u304c\u3042\u308b\u304b\u3060\u3051\u3067\u306a\u304f\u3001\u4e8c\u4eba\u304c\u540c\u6642\u306b\u7de8\u96c6\u3059\u308b\u8a66\u9a13\u3068\u3001\u4fdd\u5b58\u5f8c\u306e\u8aad\u307f\u623b\u3057\u3067\u78ba\u304b\u3081\u308b\u306e\u304c\u5b9f\u7528\u4e0a\u306e\u78ba\u8a8d\u70b9\u3067\u3059\u3002<\/p>\n<h2>\u53c2\u8003\u8cc7\u6599<\/h2>\n<ul>\n<li>[1] R. Fielding, M. Nottingham, J. Reschke (eds.), <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc9110.html\">RFC 9110: HTTP Semantics<\/a>, June 2022, STD 97\u30028.8.3\u7bc0\u306eETag\u30018.8.3.2\u7bc0\u306e\u6bd4\u8f03\u300113.1.1\u7bc0\u306eIf-Match\u300115.5.13\u7bc0\u306e412\u3092\u53c2\u7167\u3002\u4e88\u7d04\u60c5\u5831\u306e\u4f8b\u3068\u56f3\u3001\u72b6\u614b\u30e2\u30c7\u30eb\u306f\u72ec\u81ea\u306b\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4e8c\u4eba\u304c\u540c\u3058\u4e88\u7d04\u60c5\u5831\u3092\u958b\u304d\u3001\u4e00\u4eba\u306f\u4f1a\u8b70\u5ba4\u3092\u3001\u3082\u3046\u4e00\u4eba\u306f\u958b\u59cb\u6642\u523b\u3092\u76f4\u3057\u305f\u3068\u3057\u307e\u3059\u3002\u5f8c\u304b\u3089\u4fdd\u5b58\u3057\u305f\u5185\u5bb9\u304c\u3001\u5148\u306b\u884c\u308f\u308c\u305f\u5909\u66f4\u3092\u5143\u3078\u623b\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u901a\u4fe1\u306b\u6210\u529f\u3057\u3066\u3044\u3066\u3082\u3001\u7de8\u96c6\u306e\u7d50\u679c\u306f\u6b63\u3057\u304f\u6b8b\u308a\u307e\u305b\u3093\u3002 HTTP\u306eIf- [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1084,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[29],"tags":[279],"class_list":["post-1086","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-communications-networking","tag-http"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-http-if-match-lost-update-20261022-featured-11873dccb67c.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1086","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1086"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1086\/revisions"}],"predecessor-version":[{"id":1088,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1086\/revisions\/1088"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1084"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}