{"id":14645,"date":"2024-12-24T06:45:27","date_gmt":"2024-12-23T21:45:27","guid":{"rendered":"https:\/\/www.suzukikenichi.com\/blog\/?p=14645"},"modified":"2024-12-24T06:40:52","modified_gmt":"2024-12-23T21:40:52","slug":"google-explains-how-crawlers-handle-cache-control-headers","status":"publish","type":"post","link":"https:\/\/www.suzukikenichi.com\/blog\/google-explains-how-crawlers-handle-cache-control-headers\/","title":{"rendered":"Google\u304c\u63a8\u5968\u3059\u308bHTTP\u30ad\u30e3\u30c3\u30b7\u30e5\u306fETag (Last-Modified\/If-Modified-Since\u3082\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3051\u3069)"},"content":{"rendered":"<p class=\"p20-b al-r small\">[\u30ec\u30d9\u30eb: \u4e0a\u7d1a]<\/p>\n<p class=\"p60-b\">Google \u306f\u3001\u30af\u30ed\u30fc\u30e9\u30fc\u304c HTTP \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u3069\u306e\u3088\u3046\u306b\u51e6\u7406\u3059\u308b\u304b\u3092\u8aac\u660e\u3059\u308b<a href=\"https:\/\/developers.google.com\/search\/docs\/crawling-indexing\/overview-google-crawlers?hl=en#http-caching\">\u30bb\u30af\u30b7\u30e7\u30f3<\/a>\u3092\u30af\u30ed\u30fc\u30e9\u30fc\u306e\u6280\u8853\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u8ffd\u52a0\u3057\u307e\u3057\u305f\u3002<br \/>\u307e\u305f\u3001HTTP \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u4ed5\u7d44\u307f\u3092<a href=\"https:\/\/developers.google.com\/search\/blog\/2024\/12\/crawling-december-caching\">\u3055\u3089\u306b\u8a73\u3057\u304f\u89e3\u8aac\u3059\u308b\u8a18\u4e8b<\/a>\u3092\u691c\u7d22\u30bb\u30f3\u30c8\u30e9\u30eb\u30d6\u30ed\u30b0\u3067\u3082\u516c\u958b\u3057\u307e\u3057\u305f\u3002<\/p>\n<h2>HTTP 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class=\"p40-b\">\u30ad\u30e3\u30c3\u30b7\u30f3\u30b0\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u306e\u9ad8\u901f\u5316\u306b\u3082\u3064\u306a\u304c\u308a\u3001\u7d50\u679c\u3068\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u3092\u5411\u4e0a\u3055\u305b\u307e\u3059\u3002<\/p>\n<h2>Googlebot \u304c\u30b5\u30dd\u30fc\u30c8\u3059\u308b HTTP \u30ad\u30e3\u30c3\u30b7\u30e5<\/h2>\n<p>Googlebot \u306f\u3001\u6b21\u306e 2 \u7a2e\u985e\u306e HTTP \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6280\u8853\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><code>ETag<\/code> \u3068 <code>If-None-Match<\/code> \u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n<li><code>Last-Modified<\/code> \u3068 <code>If-Modified-Since<\/code> \u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n<\/ul>\n<p>Google \u3068\u3057\u3066\u306f\u3001<code>ETag<\/code> \/ <code>If-None-Match<\/code> \u306e\u69cb\u6210\u3092\u5f37\u304f\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\u3053\u3061\u3089\u306e\u65b9\u304c\u30a8\u30e9\u30fc\u3084\u8a2d\u5b9a\u30df\u30b9\u3092\u8d77\u3053\u3057\u306b\u304f\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u53ef\u80fd\u306a\u9650\u308a <code>Last-Modified<\/code> \/ <code>If-Modified-Since<\/code> \u3068\u306e\u4f75\u7528\u304c\u671b\u307e\u308c\u307e\u3059\u3002<br \/>\u3053\u3061\u3089\u3057\u304b\u30b5\u30dd\u30fc\u30c8\u3057\u306a\u3044\u30b7\u30b9\u30c6\u30e0\u304c\u30a6\u30a7\u30d6\u306b\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n<p class=\"p60-t\">\u305d\u308c\u305e\u308c\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u65b9\u5f0f\u306e\u8a73\u7d30\u306a\u69cb\u6210\u65b9\u6cd5\u306f\u6280\u8853\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3068\u30d6\u30ed\u30b0\u8a18\u4e8b\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/><span 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