{"id":5968,"date":"2011-04-20T06:00:07","date_gmt":"2011-04-19T21:00:07","guid":{"rendered":"http:\/\/www.suzukikenichi.com\/blog\/?p=5968"},"modified":"2011-04-20T05:44:08","modified_gmt":"2011-04-19T20:44:08","slug":"whether-or-not-to-block-duplicate-content-by-robots-txt","status":"publish","type":"post","link":"https:\/\/www.suzukikenichi.com\/blog\/whether-or-not-to-block-duplicate-content-by-robots-txt\/","title":{"rendered":"\u77db\u76fe\u3059\u308bGoogle\u306e\u30d8\u30eb\u30d7\uff1a\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u3092robots.txt\u3067\u30d6\u30ed\u30c3\u30af\u3059\u308b\u306e\u306fOK\uff1f\u3001NG\uff1f"},"content":{"rendered":"

\u7c73\u56fd\u7248\u306eGoogle Webmaster Central \u516c\u5f0f\u30d8\u30eb\u30d7\u30d5\u30a9\u30fc\u30e9\u30e0\u3067<\/a>\u3001\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u9632\u3050\u305f\u3081\u306erobots.txt\u306e\u5229\u7528\u306b\u3064\u3044\u3066Google\u306e\u30d8\u30eb\u30d7\u306b\u77db\u76fe\u304c\u3042\u308a\u3069\u3061\u3089\u304c\u6b63\u3057\u3044\u306e\u304b\u3068\u3044\u3046\u8cea\u554f\u304c\u6295\u7a3f\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n

\n

Google \u3068\u76f8\u6027\u306e\u826f\u3044\u30b5\u30a4\u30c8\uff0840349\uff09<\/a><\/p>\n

\u30e1\u30a4\u30f3\u306e\u30da\u30fc\u30b8\u304c\u691c\u7d22\u7d50\u679c\u306b\u542b\u307e\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u306b\u306f\u3001robots.txt \u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3053\u306e\u3088\u3046\u306a\u91cd\u8907\u30da\u30fc\u30b8\u304c\u30b9\u30d1\u30a4\u30c0\u30fc\u306b\u691c\u51fa\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/blockquote>\n

\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\uff0866359\uff09<\/a><\/p>\n

Google \u3067\u306f\u73fe\u5728\u3001robots.txt \u30d5\u30a1\u30a4\u30eb\u306a\u3069\u306e\u65b9\u6cd5\u3092\u4f7f\u7528\u3057\u3066\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u30af\u30ed\u30fc\u30e9\u3067\u30a2\u30af\u30bb\u30b9\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u306f\u304a\u3059\u3059\u3081\u3057\u3066\u3044\u307e\u305b\u3093\u3002<\/p><\/blockquote>\n

\u4e0a\u3067\u306frobots.txt\u3092\u4f7f\u3048\u3068\u8a00\u3063\u3066\u307e\u3059\u304c\u3001\u4e0b\u3067\u306f\u4f7f\u3046\u306a\u3068\u8a00\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u30d8\u30eb\u30d7\u306e\u66f4\u65b0\u65e5\u306f\u3001\u3053\u306e\u8a18\u4e8b\u3092\u66f8\u3044\u3066\u3044\u308b\u6642\u70b9\u3067\u3069\u3061\u3089\u30822011\u5e743\u670820\u65e5\u3067\u3059\u3002
\n\u3069\u3061\u3089\u304b\u304c\u53e4\u3044\u3068\u3044\u3046\u3053\u3068\u306f\u306a\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n

\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u767a\u751f\u3092\u6291\u3048\u308b\u305f\u3081\u306b\u3001robots.txt\u3092\u4f7f\u3046\u3079\u304d\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f
\n\u305d\u308c\u3068\u3082\u4f7f\u3046\u3079\u304d\u3067\u306f\u306a\u3044\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n

\u7d50\u8ad6\u3092\u8a00\u3046\u3068\u3001\u4f7f\u308f\u306a\u3044\u307b\u3046\u304c\u3088\u3055\u305d\u3046<\/strong>\u3067\u3059\u3002<\/p>\n

Google\u793e\u54e1\u306eJohn Mueller(\u30b8\u30e7\u30f3\u30fb\u30df\u30e5\u30fc\u30e9\u30fc)\u6c0f\u304c\u6b21\u306e\u3088\u3046\u306b\u30b3\u30e1\u30f3\u30c8\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\nJust to be clear — using a robots.txt disallow is not a recommended way to handle duplicate content. By using a disallow, we won’t be able to recognize that it’s duplicate content and may end up indexing the URL without having crawled it.\u00a0<\/p>\n

For example, assuming you have the same content at:
\nA) http:\/\/example.com\/page.php?id=12
\nB) http:\/\/example.com\/easter\/eggs.htm<\/p>\n

… and assuming your robots.txt file contains:
\nuser-agent: *
\ndisallow: \/*?<\/p>\n

… that would disallow us from crawling URL (A) above. However, doing that would block us from being able to recognize that the two URLs are actually showing the same content. In case we find links going to (A), it’s possible that we’ll still choose to index (A) (without having crawled it), and those links will end up counting for a URL that is basically unknown.\u00a0<\/p>\n

On the other hand, if we’re allowed to crawl URL (A), then our systems will generally be able to recognize that these URLs are showing the same content, and will be able to forward context and information (such as the links) about one URL to the version that’s indexed. Additionally, you can use the various canonicalization methods to make sure that we index the version that you prefer.\u00a0<\/p><\/blockquote>\n

\u660e\u78ba\u306b\u3057\u3066\u304a\u3053\u3046\u3002<\/p>\n

\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u51e6\u7406\u3059\u308b\u306e\u306brobots.txt\u306eDisallow\u3092\u4f7f\u3046\u306e\u306f\u63a8\u5968\u3059\u308b\u65b9\u6cd5\u3067\u306f\u306a\u3044\u3002Disallow\u3092\u4f7f\u3046\u3068\u3001\u8907\u88fd\u30b3\u30f3\u30c6\u30f3\u30c4\u3060\u3068\u3044\u3046\u3053\u3068\u3092\u8a8d\u8b58\u3067\u304d\u305a\u306b\u30af\u30ed\u30fc\u30eb\u3057\u306a\u3044\u3067\u305d\u306eURL\u3092\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/p>\n

\u305f\u3068\u3048\u3070\u4e0b\u306eURL\u3067\u540c\u3058\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u3057\u3066\u3044\u305f\u3068\u3059\u308b\u3002
\nA) http:\/\/example.com\/page.php?id=12
\nB) http:\/\/example.com\/easter\/eggs.htm<\/p>\n

\u305d\u3057\u3066robots.txt\u30d5\u30a1\u30a4\u30eb\u306b\u6b21\u306e\u3088\u3046\u306a\u8a18\u8ff0\u304c\u3042\u3063\u305f\u3068\u3059\u308b\u3002
\nuser-agent: *
\ndisallow: \/*?<\/p>\n

\u3053\u3046\u3059\u308b\u3068\u3001\u4e0a\u306eURL(A)\u3078\u306e\u30af\u30ed\u30fc\u30eb\u3092Google\u306f\u7981\u6b62\u3055\u308c\u308b\u3002\u3057\u304b\u3057\u3001\u305d\u3046\u3057\u3066\u3057\u307e\u3046\u30682\u3064\u306eURL\u304c\u5b9f\u969b\u306b\u306f\u540c\u3058\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u898b\u305b\u3066\u3044\u308b\u3053\u3068\u304cGoogle\u306b\u306f\u5206\u304b\u3089\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u3002<\/p>\n

(A)\u306b\u5f35\u3089\u308c\u3066\u3044\u308b\u30ea\u30f3\u30af\u3092\u767a\u898b\u3057\u305f\u5834\u5408\u3001\u30af\u30ed\u30fc\u30eb\u3057\u306a\u304f\u3066\u3082\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u5f97\u308b\u3002\u7d50\u679c\u3068\u3057\u3066\u3001\u305d\u306e\u30ea\u30f3\u30af\u306f\u3001\u57fa\u672c\u7684\u306b\u306f\u4e2d\u8eab\u306e\u5206\u304b\u3089\u306a\u3044\u30da\u30fc\u30b8\u3078\u306e\u30ea\u30f3\u30af\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u3002<\/p>\n

\u4e00\u65b9\u3001URL(A)\u3078\u306e\u30af\u30ed\u30fc\u30eb\u304c\u8a31\u53ef\u3055\u308c\u3066\u3044\u308c\u3070\u3001\u79c1\u305f\u3061\u306e\u30b7\u30b9\u30c6\u30e0\u306f2\u3064\u306eURL\u304c\u540c\u3058\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u898b\u305b\u3066\u3044\u308b\u3068\u901a\u5e38\u306f\u8a8d\u8b58\u3057\u3066\u3001\u5185\u5bb9\u3084\u30ea\u30f3\u30af\u306a\u3069\u306e\u60c5\u5831\u3092\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3055\u308c\u3066\u3044\u308b\u7247\u65b9\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306eURL\u3078\u53d7\u3051\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n

\u305d\u306e\u4e0a\u3001\u81ea\u5206\u304c\u9078\u3093\u3060\u30d0\u30fc\u30b8\u30e7\u30f3\u306eURL\u3092Google\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3055\u305b\u308b\u305f\u3081\u306b\u3055\u307e\u3056\u307e\u306a\u6b63\u898f\u5316\u306e\u624b\u6bb5\u304c\u4f7f\u3048\u308b\u3002<\/p>\n<\/blockquote>\n

robots.txt\u3067\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u30af\u30ed\u30fc\u30eb\u3067\u304d\u306a\u3044\u306e\u3067Google\u306f\u305d\u306e\u30da\u30fc\u30b8\u306b\u4f55\u304c\u66f8\u3044\u3066\u3042\u308b\u304b\u5206\u304b\u308a\u307e\u305b\u3093\u3002
\n2\u3064\uff08\u4ee5\u4e0a\uff09\u306e\u30da\u30fc\u30b8\u304c\u540c\u3058\u30b3\u30f3\u30c6\u30f3\u30c4\u3060\u3063\u305f\u3068\u3057\u3066\u3082\u3001\u4e2d\u8eab\u3092\u898b\u308c\u306a\u3044\u306e\u3067\u540c\u3058\u304b\u3069\u3046\u304b\u5224\u65ad\u3067\u304d\u308b\u306f\u305a\u304c\u3042\u308a\u307e\u305b\u3093\u306d\u3002
\n\u3064\u307e\u308a\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8a8d\u8b58\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n

\u307e\u305frobots.txt\u3067\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u305f\u3068\u3057\u3066\u3082\u3001\u30ea\u30f3\u30af\u306f\u305d\u306e\u30d6\u30ed\u30c3\u30af\u3057\u305fURL\u306b\u5f35\u3089\u308c\u305f\u3082\u306e\u3068\u3057\u3066\u8a55\u4fa1\u3057\u307e\u3059\u3002
\n\u30d0\u30c3\u30af\u30ea\u30f3\u30af\u304c\u591a\u304f\u5f35\u3089\u308c\u305f\u3068\u304d\u306f\u3001\u30af\u30ed\u30fc\u30eb\u305b\u305a\u3068\u3082\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3057\u3066\u691c\u7d22\u7d50\u679c\u306b\u51fa\u3059<\/a>\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u305f\u3068\u3057\u3066\u3082\u305d\u306eURL\u3078\u306e\u30ea\u30f3\u30af\u306f\u305d\u306eURL\u3078\u306e\u30ea\u30f3\u30af\u3067\u3001\u4e2d\u8eab\u304c\u5206\u304b\u3089\u306a\u3044\u4ee5\u4e0a\u540c\u3058\u30b3\u30f3\u30c6\u30f3\u30c4\u306eURL\u304c\u3042\u3063\u305f\u3068\u3057\u3066\u3082\u7d71\u5408\u306f\u3057\u3066\u304f\u308c\u307e\u305b\u3093\u3002
\n\u300c\u3057\u3066\u304f\u308c\u307e\u305b\u3093\u300d\u3068\u3044\u3046\u3088\u308a\u306f\u3001\u4e2d\u8eab\u304c\u898b\u3048\u305a\u540c\u3058\u3060\u3068\u5206\u304b\u3089\u306a\u3044\u306e\u3067\u3067\u304d\u308b\u306f\u305a\u304c\u3042\u308a\u307e\u305b\u3093\u306d\u3002<\/p>\n

\u5185\u5bb9\u304c\u540c\u3058\u30b3\u30f3\u30c6\u30f3\u30c4\u3060\u3068\u5206\u304b\u3063\u3066\u3082\u3089\u3063\u3066\u521d\u3081\u3066\u3001\u6b63\u898f\u5316\u3057\u3066\u3082\u3089\u3048\u308b\u308f\u3051\u3067\u3059\u306d\u3002<\/p>\n

\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u767a\u751f\u3092\u9632\u6b62\u3059\u308b\u305f\u3081\u306brobots.txt\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3001\u73fe\u5728\u306f\u63a7\u3048\u305f\u307b\u3046\u304c\u3044\u3044\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

John Mueller\u6c0f\u304c\u6700\u5f8c\u306b\u4ed8\u3051\u52a0\u3048\u3066\u3044\u308b\u3088\u3046\u306b\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u9632\u3050\u306b\u306f\u3044\u304f\u3064\u304b\u624b\u6bb5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u3057\u304b\u3057Google\u306f\u4f55\u3082\u3057\u306a\u304f\u3066\u3082\u3001\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u3060\u3068\u5224\u65ad\u3057\u305f\u5834\u5408 \u52dd\u624b\u306b\u6b63\u898f\u5316\u3057\u3066\u304f\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\uff08\u5fc5\u305a\u3067\u306f\u306a\u3044\u3051\u308c\u3069\uff09\u3002
\n\u306a\u306e\u3067\u3001\u4ed5\u7d44\u307f\u3092\u78ba\u5b9f\u306b\u7406\u89e3\u3067\u304d\u3066\u3044\u306a\u3044\u306a\u3089\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u3042\u3063\u3066\u3082\u305d\u306e\u307e\u307e\u306b\u3057\u3066\u304a\u3044\u3066\u3001\u3042\u3068\u306e\u51e6\u7406\u306f\u81ea\u5206\u305f\u3061\u306b\u4efb\u305b\u308d<\/a>\u3068\u3082\u904e\u53bb\u306b\u8a00\u3063\u3066\u3044\u307e\u3059\uff08\u3067\u3082\u73fe\u5b9f\u306b\u306f100%\u983c\u308a\u306b\u306f\u3067\u304d\u306a\u3044\uff09\u3002<\/p>\n

\u306a\u304a\u91cd\u8907\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u9632\u3050\u306b\u306f\u6b21\u306e\u3088\u3046\u306a\u624b\u6bb5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n