{"id":34255,"date":"2023-09-30T14:05:05","date_gmt":"2022-11-21T08:15:55","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%a0%e6%b3%95%e5%85%b3%e9%97%ad%e4%bc%9a%e8%af%9d%e8%ad%a6%e6%8a%a5\/"},"modified":"2024-05-04T02:13:52","modified_gmt":"2024-05-03T18:13:52","slug":"%e6%97%a0%e6%b3%95%e5%85%b3%e9%97%ad%e4%bc%9a%e8%af%9d%e8%ad%a6%e6%8a%a5","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%a0%e6%b3%95%e5%85%b3%e9%97%ad%e4%bc%9a%e8%af%9d%e8%ad%a6%e6%8a%a5\/","title":{"rendered":"\u65e0\u6cd5\u5173\u95ed\u4f1a\u8bdd\u8b66\u62a5"},"content":{"rendered":"<h2>\u524d\u8a00<\/h2>\n<p>\u65e9\u4e0a\u597d\/\u665a\u4e0a\u597d\u3002<br \/>\n\u6211\u662fUna\uff0c\u662fAncar\u80a1\u4efd\u6709\u9650\u516c\u53f8\u7684Web\u5de5\u7a0b\u5e08\u3002<br \/>\n\u8fd9\u6b21\u6211\u5c06\u62c5\u4efb\u300c\u682a\u5f0f\u4f1aAncar ~Advent Calendar 2019~\u300d\u7684\u7b2c\u516b\u5929\u4efb\u52a1\u3002<\/p>\n<p>\u6211\u5011\u7684\u5b97\u65e8\u662f\u63d0\u4f9b\u5b89\u5fc3\u5b89\u5168\u7684\u79fb\u52d5\u9ad4\u9a57\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u4e2d\u53e4\u8eca\u306e\u500b\u4eba\u9593\u58f2\u8cb7\u3092\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u884c\u3046\u30b5\u30fc\u30d3\u30b9<\/ul>\n<\/li>\n<\/ul>\n<p>\u5168\u56fd\u306e\u4e2d\u53e4\u8eca\u304b\u3089\u304a\u8cb7\u3044\u5f97\u306a\u8eca\u3092\u691c\u7d22\u30fb\u6bd4\u8f03\u3067\u304d\u308b\u30b5\u30fc\u30d3\u30b9<br \/>\n\u3092\u5c55\u958b\u3057\u3066\u304a\u308a\u307e\u3059\u3002<\/p>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u5206\u4eab\u5728\u670d\u52d9\u904b\u71df\u671f\u9593\u51fa\u73fe\u7684\u8b66\u544a\u8655\u7406\u65b9\u6cd5\u3002<\/p>\n<h2>\u603b\u7ed3\u4e3a3\u6761\u7b80\u8981\u63cf\u8ff0<\/h2>\n<p>PHP Warning: SessionHandler::read(): Unable to clear session lock record\u304c3\u4ef6\/\u65e5\u3050\u3089\u3044\u767a\u751f<br \/>\n\u3069\u3046\u3084\u3089\u30bb\u30c3\u30b7\u30e7\u30f3\u30ed\u30c3\u30af\u5468\u308a\u304c\u602a\u3057\u3044 \u2192 n\u5ea6\u4fee\u6b63 \u2192 \u9cf4\u308a\u6b62\u307e\u306a\u3044\u30a2\u30e9\u30fc\u30c8<br \/>\nmemcached\u304b\u3089redis\u3092\u79fb\u884c\u3055\u305b\u305f\u7d50\u679c\u3001\u76f4\u3063\u305f\uff08\u5b09\u3057\u3044<\/p>\n<h2>\u6bcf\u5929\u67093\u4e2a\u4f1a\u8bae\u63d0\u9192\u3002<\/h2>\n<p>mackerel\u3068\u3044\u3046\u30b5\u30fc\u30d0\u30fc\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u304b\u3089\u3001\u983b\u7e41\u306b\u30a2\u30e9\u30fc\u30c8\u304c\u3042\u304c\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002<br \/>\n\u5185\u5bb9\u306fPHP Warning: SessionHandler::read(): Unable to clear session lock record<br \/>\n\u30a2\u30e9\u30fc\u30c8\u304c\u5897\u52a0\u3057\u3066\u3044\u308b\u4e0a\u306b\u3001SEO\u306b\u3082\u5f71\u97ff\u304c\u51fa\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u307e\u3063\u3066\u304d\u305f\u305f\u3081\u3001\u5bfe\u51e6\u306b\u52d5\u3044\u305f\u3002<\/p>\n<h3>\u90a3\u4e2a\u65f6\u5019\u7684\u73af\u5883<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">PHP7.1<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">memcached3.0.3(elasticache)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">nginx\/1.10<\/ul>\n<h2>\u8fd9\u662f\u7531\u4e8e\u4f1a\u8bdd\u9501\u5b9a\u5417\uff1f<\/h2>\n<p>\u7ecf\u8fc7\u5411\u8c37\u6b4c\u5148\u751f\u8be2\u95ee\u8b66\u62a5\u5185\u5bb9\u540e\uff0c\u53d1\u73b0\u4f1a\u8bdd\u9501\u5b9a\u5b58\u5728\u53ef\u7591\u60c5\u51b5\u3002<\/p>\n<blockquote><p>\u4e3a\u4e86\u9632\u6b62\u5e76\u53d1\u5199\u5165\uff0c\u4f1a\u5bf9\u4f1a\u8bdd\u6570\u636e\u8fdb\u884c\u9501\u5b9a\uff0c\u56e0\u6b64\u5728\u67d0\u4e00\u65f6\u523b\u53ea\u80fd\u6709\u4e00\u4e2a\u811a\u672c\u6765\u5904\u7406\u4f1a\u8bdd\u3002\u8bf7\u53c2\u8003\u94fe\u63a5\uff1ahttps:\/\/www.php.net\/manual\/ja\/function.session-write-close.php<\/p><\/blockquote>\n<p>\u6362\u8a00\u4e4b\uff0c\u6211\u63a8\u6d4b\u5728\u4f1a\u8bdd\u5df2\u7ecf\u88ab\u9501\u5b9a\u7684\u60c5\u51b5\u4e0b\uff0c\u8bd5\u56fe\u518d\u6b21\u5411\u8be5\u4f1a\u8bdd\u5199\u5165\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d1c6037434c4406c109e9\/15-1.png\" alt=\"image.png\" \/><\/div>\n<p>\u6211\u5145\u6ee1\u4fe1\u5fc3\u5730\u4e3a\/etc\/php\/7.1\/fpm\/conf.d\/25-memcached.ini\u4e2d\u7684sess_lock\u8bbe\u7f6e\u4e86\u4e0e\u6d4b\u8bd5\u670d\u52a1\u5668\u76f8\u540c\u7684\u65f6\u95f4\u3002\u544a\u522b\u4e86\u8b66\u62a5&#8230;(\u6211\u4e5f\u66fe\u6709\u8fc7\u8fd9\u6837\u7684\u65f6\u671f).<\/p>\n<p>\u7ed3\u679c\uff0c\u53d1\u751f\u4e86\u8b66\u62a5&#8230;<br \/>\n\u4ece\u8fd9\u91cc\u5f00\u59cb\uff0c\u6211\u4e0e\u8b66\u62a5\u4e4b\u95f4\u7684\u6fc0\u70c8\u6218\u6597\uff08\u4e00\u4e2a\u4e27\u5c38\u6e38\u620f\uff09\u5f00\u59cb\u4e86\u3002<\/p>\n<h2>\u53ea\u4f9d\u9760\u6447\u6eda\u65f6\u95f4\u8fd8\u4e0d\u8db3\u591f\u5417\uff1f<\/h2>\n<p>\u5728\u4e4b\u524d\u7684\u6230\u9b25\u4e2d\uff0c\u6709\u9ede\u904e\u65bc\u6025\u8e81\u3002\u4e0b\u5b9a\u6c7a\u5fc3\u9032\u884c\u7262\u56fa\u5730\u4f54\u9818\uff0c\u958b\u59cb\u6df1\u5165\u7814\u7a76\u554f\u984c\u3002\u53c3\u8003\u4e86\u9019\u4e9b\u554f\u984c\uff0c\u4f86\u5b8c\u5584\u8a2d\u5b9a\u3002<\/p>\n<pre class=\"post-pre\"><code>session.lazy_write = Off;\r\nmemcached.sess_lock_wait_min = 100;\r\nmemcached.sess_lock_wait_max = 150;\r\nmemcached.sess_lock_retries = 30;\r\nmemcached.sess_lock_expire = 45;\r\n<\/code><\/pre>\n<p>\u4f46\u662f\uff0c\u8b66\u62a5\u58f0\u54cd\u8d77\u5f97\u5f88\u6b22\u5feb\u3002<br \/>\n\u76f8\u53cd\uff0c\u5b83\u7a0d\u5fae\u589e\u591a\u4e86\u4e00\u4e9b\u3002<br \/>\n\u539f\u6765\u5982\u6b64\uff0c\u96be\u9053\u6ca1\u6709\u601c\u60af\u4e4b\u5fc3\u5417&#8230;<\/p>\n<p>\u5f53\u6211\u5f00\u59cb\u6df1\u5165\u7814\u7a76\u8fd9\u4e2a\u95ee\u9898\u65f6\uff0c\u6211\u610f\u8bc6\u5230\u8fd9\u4e2a\u95ee\u9898\u5176\u5b9e\u6bd4\u6211\u60f3\u8c61\u7684\u66f4\u4e3a\u4e25\u91cd\u6839\u6df1\u8482\u56fa\u3002<br \/>\n\u4fee\u590d\u7684\u65b9\u6cd5\u6709\u4e9b\u60c5\u51b5\u662f\u53ef\u4ee5\u901a\u8fc7\u4e4b\u524d\u7684\u4fee\u6b63\u6765\u89e3\u51b3\u7684\uff0c\u4f46\u4e5f\u6709\u76f8\u53cd\u7684\u60c5\u51b5\u3002<br \/>\n\u5728PHP7.1\u4ee5\u524d\u548cmemcached\u642d\u914d\u4f7f\u7528\u65f6\uff0c\u8fd9\u4e2a\u95ee\u9898\u9891\u7e41\u53d1\u751f\uff0c\u5f88\u53ef\u80fd\u662f\u7531\u4e8ePHP\u7684\u7248\u672c\u95ee\u9898\u6240\u5bfc\u81f4\u7684\u3002<\/p>\n<p>\u901a\u8fc7\u591a\u6b21\u66f4\u6539\u8bbe\u7f6e\u7684\u5b9e\u9645\u7ecf\u9a8c\uff0c\u6211\u6df1\u523b\u611f\u53d7\u5230\uff0c\u5bf9\u4ed8\u8fd9\u4ee4\u4eba\u538c\u6076\u7684\u8b66\u62a5\u5e76\u4e0d\u662f\u4e00\u4e2a\u5408\u9002\u7684\u65b9\u6cd5\u3002<br \/>\n\u4ee5\u4e0b\u662f\u88ab\u8ba4\u4e3a\u662f\u6709\u6548\u7684\u9009\u9879\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">PHP7.2\u4ee5\u4e0a<\/ul>\n<\/li>\n<\/ul>\n<p>cf: https:\/\/github.com\/php-memcached-dev\/php-memcached\/issues\/269#issuecomment-519886598<\/p>\n<p>redis\u3078\u79fb\u884c<\/p>\n<p>cf: https:\/\/github.com\/magento\/magento2\/issues\/5319#issuecomment-265595804<\/p>\n<h2>\u8fc1\u79fb\u5230Redis<\/h2>\n<p>\u8003\u8651\u5230\u5bf9\u670d\u52a1\u7684\u5f71\u54cd\uff0cPHP\u7684\u66f4\u65b0\u5de5\u4f5c\u98ce\u9669\u4e0e\u56de\u62a5\u4e0d\u6210\u6b63\u6bd4\uff0c\u56e0\u6b64\u51b3\u5b9a\u653e\u5f03\u3002<br \/>\n\u7ed3\u679c\uff0c\u51b3\u5b9a\u6539\u53d8\u8def\u7ebf\uff0c\u8f6c\u5411redis\u8fc1\u79fb\u3002<br \/>\n\u540c\u65f6\uff0c\u6076\u8d2f\u6ee1\u76c8\u7684\u5bf9\u624b\u5347\u7ea7\u4e3a\u5bbf\u654c\uff0c\u547c\u5578\u5148\u751f\u6210\u4e3a\u4e86\u4e00\u540d\u654c\u4eba\u3002<\/p>\n<h3>\u8f6c\u578b\u7684\u5173\u5207<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">redis\u79fb\u884c\u3067\u554f\u984c\u304c\u672c\u5f53\u306b\u89e3\u6c7a\u3059\u308b\u306e\u304b<\/ul>\n<\/li>\n<\/ul>\n<p>\u6253\u3061\u624b: redis\u306b\u3057\u3066\u89e3\u6c7a\u3057\u305f\u30bd\u30fc\u30b9\u3042\u308a<br \/>\n\u6253\u3061\u624b: \u672c\u756a2\u53f7\u6a5f\u30b5\u30fc\u30d0\u30fc\u3067\u78ba\u8a8d<\/p>\n<p>\u79fb\u884c\u5f8c\u306bmemcached\u306b\u623b\u308c\u308b\u306e\u304b<\/p>\n<p>\u6253\u3061\u624b: \u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3092redis\u306b\u5411\u3051\u3066\u5bfe\u5fdc\uff08memcached\u306e\u8a2d\u5b9a\u3092\u4e0a\u66f8\u304d\uff09<br \/>\n\u6253\u3061\u624b: \u30c6\u30b9\u30c8\u74b0\u5883\u3067\u53cc\u65b9\u5411(memcached \u2194 redis)\u306e\u884c\u304d\u304d\u3092\u3057\u3001\u5f8c\u623b\u308a\u3067\u304d\u308b\u3053\u3068\u3092\u78ba\u8a8d<\/p>\n<p>redis\u79fb\u884c\u3067\u4ed6\u306b\u554f\u984c\u304c\u8d77\u304d\u306a\u3044\u306e\u304b<\/p>\n<p>\u6253\u3061\u624b: \u30c6\u30b9\u30c8\u74b0\u5883\u3067\u78ba\u8a8d<br \/>\n\u6253\u3061\u624b: \u672c\u756a2\u53f7\u6a5f\u30b5\u30fc\u30d0\u30fc\u3067\u691c\u8a3c<\/p>\n<p>\u5f71\u97ff\u7bc4\u56f2\u304c\u5927\u304d\u3044\u305f\u3081\u3001\u6253\u3061\u624b\u3068\u624b\u9806\u3092\u8003\u3048\u3066\u5b9f\u884c\u3057\u305f\u3002<br \/>\n1. \u30c6\u30b9\u30c8\u74b0\u5883\u3067\u5b9f\u88c5\u3057\u305f\u5f8c\u3001\u52d5\u4f5c\u78ba\u8a8d\u3002<br \/>\n2. \u672c\u756a\u74b0\u5883\u306e\u5197\u9577\u69cb\u6210\u306e\u30b5\u30fc\u30d0\u30fc\u3092\u9593\u501f\u308a\u3057\u3066\u3001\u52d5\u4f5c\u78ba\u8a8d\u3002<br \/>\n3. \u672c\u756a\u306b\u5b8c\u5168\u79fb\u884c\u3002<\/p>\n<h2>Redis \u8fc1\u79fb\u7684\u6b65\u9aa4<\/h2>\n<p>\u5f88\u9057\u61be\uff0cElastiCache\u4e0d\u652f\u6301\u81ea\u52a8\u5c06Memcached\u4eceRedis\u8fc1\u79fb\u81f3Redis\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5728Elasticache\u4e2d\u521b\u5efa\u4e00\u4e2aRedis\u5b9e\u4f8b<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5c06Redis\u7aef\u53e3\uff086379\uff09\u6dfb\u52a0\u5230ELB\u7684\u5b89\u5168\u7ec4<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5728\u670d\u52a1\u5668\u5185\u90e8\u6267\u884cpecl install redis\u547d\u4ee4<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5728\/etc\/php\/7.1\/fpm\/php.ini\u6587\u4ef6\u4e2d\u6dfb\u52a0extension=redis.so<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u5728\/etc\/php\/7.1\/fpm\/php.ini\u6587\u4ef6\u4e2d\u6dfb\u52a0session.save_handler\u548csession.save_path<\/ol>\n<pre class=\"post-pre\"><code>session.save_handler = redis\r\nsession.save_path = ****.cache.amazonaws.com:6379\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d1c6037434c4406c109e9\/34-1.png\" alt=\"image.png\" \/><\/div>\n<h2>\u9759\u9ed8\u7684\u8b66\u62a5<\/h2>\n<p>\u5728\u89e3\u51b3\u4e4b\u524d\u7684\u62c5\u5fe7\u540e\uff0c\u6211\u4eec\u8fdb\u884c\u4e86Redis\u7684\u5b8c\u5168\u8fc1\u79fb\uff0c\u6570\u5929\u8fc7\u53bb\u4e86\u3002<br \/>\n\u7136\u800c\uff0c\u5bbf\u654c\u4ecd\u672a\u73b0\u8eab\u2026<br \/>\n\u90a3\u4e2a\u6bcf\u9694\u6570\u4e2a\u5c0f\u65f6\u5c31\u4f1a\u5192\u51fa\u6765\u7684\u5bb6\u4f19\uff0c\u5c45\u7136\u6570\u5929\u90fd\u6ca1\u6709\u9732\u9762\u2026<br \/>\n\u56e0\u6b64\uff0c\u6211\u8981\u5ba3\u5e03\u80dc\u5229\u4e86\u3002<\/p>\n<h3>\u95f2\u8bdd<\/h3>\n<p>\u5728\u76d1\u89c6Alert\u5148\u751f\u65f6\uff0c\u6211\u4f7f\u7528Apache Bench\uff08\u4ee5\u4e0b\u7b80\u79f0\u4e3aab\uff09\u5bf9Memcached\u548cRedis\u8fdb\u884c\u4e86\u8d1f\u8f7d\u6d4b\u8bd5\u3002<br \/>\n\u7531\u4e8e\u8d1f\u8f7d\u6d4b\u8bd5\u7684\u7ed3\u679c\u4f1a\u56e0\u6d4b\u8bd5\u73af\u5883\u800c\u6709\u6240\u4e0d\u540c\uff0c\u56e0\u6b64\u9700\u8981\u5728\u4e00\u4e9b\u4e0d\u540c\u7684\u5730\u65b9\u8fdb\u884c\u6d4b\u8bd5\u3002<br \/>\n\u6b64\u5916\uff0c\u636e\u8bf4AWS\u4e0d\u518d\u9700\u8981\u4e8b\u5148\u7533\u8bf7\u6e17\u900f\u6d4b\u8bd5\u3002<\/p>\n<p>\u82f9\u679c\u7535\u8111\u81ea\u5e26ab\uff0c\u4f46\u5982\u679c\u5728\u670d\u52a1\u5668\u4e0a\u4f7f\u7528\uff0c\u5219\u9700\u8981\u5b89\u88c5\u3002<br \/>\nsudo apt install apache2-utils \/\/\u4ec5\u5b89\u88c5ab\u8f6f\u4ef6\u5305<\/p>\n<h4>\u8fdb\u884cab\u8d1f\u8f7d\u6d4b\u8bd5<\/h4>\n<p>Redis\u6bd4\u8f83\u5feb&#8230;!!<\/p>\n<div>\n<div class=\"post-table\">1\u79d2\u9593\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u51e6\u7406\u6bd4\u8f03memcachedredisab -n 1000 -c 100 \/\/10\u56de\u00d7100\u4eba41.93\/sec41.53\/secab -n 10000 -c 100 \/\/100\u56de\u00d7100\u4eba42.79\/sec41.65\/sec<\/div>\n<\/div>\n<h4>\u4f30\u8a08\/\u731c\u6e2c<\/h4>\n<p>\u5c3d\u7ba1\u5bf9memcached\u548credis\u65bd\u52a0\u4e86\u7c7b\u4f3c\u4e8e\u81ea\u6211\u62d2\u7edd\u670d\u52a1\u653b\u51fb\u7684\u8d1f\u8f7d\uff0c\u4f46\u672a\u5f15\u53d1\u8b66\u62a5\u3002<br \/>\n\u7531\u6b64\u53ef\u77e5\uff0c\u8b66\u62a5\u4e0d\u662f\u7531\u4e8e\u4f1a\u8bdd\u589e\u52a0\u800c\u4ea7\u751f\u7684\u3002<br \/>\n\u8fd9\u4e0d\u662f\u7531\u4e8e\u603b\u6570\u7684\u589e\u52a0\u800c\u5f15\u53d1\u7684\uff0c\u800c\u662f\u7531\u4e8e\u65e0\u6cd5\u5199\u5165\u4f1a\u8bdd\u3002<br \/>\n\u7f51\u7ad9\u7684\u9875\u9762\u8bbf\u95ee\u91cf\u548c\u4f1a\u8bdd\u8b66\u62a5\u7684\u589e\u52a0\u770b\u8d77\u6765\u5728\u65f6\u95f4\u4e0a\u6709\u5173\u8054\uff0c\u4f46\u6839\u672c\u539f\u56e0\u5c1a\u672a\u89e3\u660e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u65e9\u4e0a\u597d\/\u665a\u4e0a\u597d\u3002 \u6211\u662fUna\uff0c\u662fAncar\u80a1\u4efd\u6709\u9650\u516c\u53f8\u7684Web\u5de5\u7a0b\u5e08\u3002 \u8fd9\u6b21\u6211\u5c06\u62c5\u4efb\u300c\u682a\u5f0f\u4f1aAncar  [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-34255","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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