{"id":19243,"date":"2022-02-12T03:37:00","date_gmt":"2022-02-11T20:37:00","guid":{"rendered":"https:\/\/speed.family\/?p=19243"},"modified":"2023-08-22T22:59:45","modified_gmt":"2023-08-22T15:59:45","slug":"caching-trong-wordpress","status":"publish","type":"post","link":"https:\/\/kiencang.net\/caching-trong-wordpress\/","title":{"rendered":"Cache trong WordPress: T\u1ea5t c\u1ea3 nh\u1eefng \u0111i\u1ec1u b\u1ea1n c\u1ea7n bi\u1ebft"},"content":{"rendered":"\n<p>V\u00e0i n\u0103m qua khi ch\u00fang t\u00f4i th\u1ef1c hi\u1ec7n c\u00f4ng vi\u1ec7c h\u1ed7 tr\u1ee3 s\u1ea3n ph\u1ea9m c\u1ee7a m\u00ecnh t\u1ea1i&nbsp;<strong>Delicious Brains<\/strong>&nbsp;(\u0111\u1eb7c bi\u1ec7t v\u1edbi&nbsp;<a href=\"https:\/\/spinupwp.com\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">plugin WP Offload Media<\/a>&nbsp;v\u00e0 g\u1ea7n \u0111\u00e2y nh\u1ea5t l\u00e0&nbsp;<a href=\"https:\/\/spinupwp.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">SpinupWP<\/a>), m\u1ed9t \u0111i\u1ec1u ch\u00fang t\u00f4i th\u1ea5y r\u00f5 r\u00e0ng l\u00e0:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p>M\u1ecdi ng\u01b0\u1eddi hi\u1ec3u sai v\u1ec1 Cache trong WordPress (v\u00e0 h\u1ec7 qu\u1ea3 l\u00e0 c\u00e1c trang ch\u1ea1y ch\u1eadm h\u01a1n so v\u1edbi n\u00f3 c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c).<\/p>\n<\/blockquote>\n\n\n\n<p>Trong b\u00e0i n\u00e0y, t\u00f4i hy v\u1ecdng s\u1ebd l\u00e0m s\u00e1ng t\u1ecf m\u1ed9t s\u1ed1 ng\u1ed9 nh\u1eadn v\u00e0 cung c\u1ea5p c\u00e1i nh\u00ecn r\u00f5 r\u00e0ng h\u01a1n (m\u1ed9t ch\u00fat) v\u00e0o v\u1ea5n \u0111\u1ec1 cache tr\u00ean WordPress, c\u00e1i v\u1ed1n r\u1ea5t ph\u1ee9c t\u1ea1p.<\/p>\n\n\n\n<p>Hy v\u1ecdng l\u00e0 \u0111\u1ebfn cu\u1ed1i b\u00e0i, b\u1ea1n s\u1ebd hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 vai tr\u00f2 c\u1ee7a nhi\u1ec1u l\u1edbp cache trong&nbsp;<a href=\"https:\/\/kiencang.net\/tang-toc-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">t\u0103ng t\u1ed1c WordPress<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d61c8a4c1\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d61c8a4c1\"  type=\"checkbox\" id=\"item-6577d61c8a4c1\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/caching-trong-wordpress\/#1_Tai_sao_Cache_lai_quan_trong\" title=\"#1. T\u1ea1i sao Cache l\u1ea1i quan tr\u1ecdng?\">#1. T\u1ea1i sao Cache l\u1ea1i quan tr\u1ecdng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/caching-trong-wordpress\/#2_Cac_lop_cache\" title=\"#2. C\u00e1c l\u1edbp cache\">#2. C\u00e1c l\u1edbp cache<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/caching-trong-wordpress\/#3_Cache_phia_trinh_duyet\" title=\"#3. Cache ph\u00eda tr\u00ecnh duy\u1ec7t\">#3. Cache ph\u00eda tr\u00ecnh duy\u1ec7t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/caching-trong-wordpress\/#4_Page_Cache\" title=\"#4. Page Cache\">#4. Page Cache<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/caching-trong-wordpress\/#5_Object_Caching\" title=\"#5. Object Caching\">#5. Object Caching<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/caching-trong-wordpress\/#6_Tong_ket\" title=\"#6. T\u1ed5ng k\u1ebft\">#6. T\u1ed5ng k\u1ebft<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"t\u1ea1i-sao-cache-l\u1ea1i-quan-tr\u1ecdng\"><span class=\"ez-toc-section\" id=\"1_Tai_sao_Cache_lai_quan_trong\"><\/span>#1. T\u1ea1i sao Cache l\u1ea1i quan tr\u1ecdng?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Tr\u01b0\u1edbc khi ch\u00fang ta \u0111i s\u00e2u v\u00e0o c\u00e1c c\u01a1 ch\u1ebf b\u1ed9 \u0111\u1ec7m kh\u00e1c nhau, \u0111i\u1ec1u c\u0103n b\u1ea3n m\u00e0 ch\u00fang ta ph\u1ea3i hi\u1ec3u l\u00e0 l\u1ee3i \u00edch c\u1ee7a cache l\u00e0 g\u00ec? Cache \u0111\u00f3ng hai vai tr\u00f2 ch\u00ednh:<\/p>\n\n\n\n<ol>\n<li><strong>N\u00f3 n\u00e2ng cao hi\u1ec7u su\u1ea5t (performance) c\u1ee7a \u1ee9ng d\u1ee5ng<\/strong>. V\u1edbi c\u00e1c trang WordPress, \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 trang c\u1ee7a b\u1ea1n t\u1ea3i nhanh h\u01a1n.<\/li>\n\n\n\n<li><strong>N\u00f3 n\u00e2ng kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i (throughput)<\/strong>. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 trang c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 x\u1eed l\u00fd \u0111\u01b0\u1ee3c nhi\u1ec1u truy c\u1eadp h\u01a1n.<\/li>\n<\/ol>\n\n\n\n<p>Ngo\u00e0i ra, cache c\u00f3 th\u1ec3 l\u00e0m t\u0103ng c\u1ea3 hi\u1ec7u su\u1ea5t v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i m\u00e0&nbsp;<a href=\"https:\/\/kiencang.net\/lang-phi-hosting\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>kh\u00f4ng l\u00e0m t\u0103ng chi ph\u00ed hosting<\/strong><\/a>. \u0110i\u1ec1u n\u00e0y c\u00f3 \u0111\u01b0\u1ee3c do b\u1ea1n c\u1ea7n \u00edt t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng h\u01a1n (CPU v\u00e0 b\u1ed9 nh\u1edb) \u0111\u1ec3 l\u01b0u tr\u1eef trang \u0111\u00e3 \u0111\u01b0\u1ee3c cache ch\u00ednh x\u00e1c. \u0110\u00e2y l\u00e0 chi\u1ebfn l\u01b0\u1ee3c win-win \/ c\u00f9ng th\u1eafng (khi \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ch\u00ednh x\u00e1c).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"cac-l\u1edbp-cache\"><span class=\"ez-toc-section\" id=\"2_Cac_lop_cache\"><\/span>#2. C\u00e1c l\u1edbp cache<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>WordPress l\u00e0 h\u1ec7 qu\u1ea3n tr\u1ecb n\u1ed9i dung&nbsp;<a href=\"https:\/\/kiencang.net\/toi-uu-database-wordpress-toan-dien\/\" target=\"_blank\" rel=\"noreferrer noopener\">d\u1ef1a tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/a>&nbsp;(database-driven CMS), \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a r\u1eb1ng c\u00f3 nhi\u1ec1u <em>th\u00e0nh ph\u1ea7n \u0111\u1ed9ng<\/em> khi n\u00f3 ph\u1ea3i x\u1eed l\u00fd m\u1ed9t y\u00eau c\u1ea7u.<\/p>\n\n\n\n<p>WordPress khi c\u00e0i \u0111\u1eb7t theo ki\u1ec3u th\u00f4ng th\u01b0\u1eddng, \u0111\u01a1n gi\u1ea3n ph\u1ea3i truy v\u1ea5n \u0111\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 xu\u1ea5t trang (reder page) tr\u01b0\u1edbc khi n\u00f3 c\u00f3 th\u1ec3 g\u1eedi \u0111\u1ebfn ng\u01b0\u1eddi d\u00f9ng.<\/p>\n\n\n\n<p>\u0110i\u1ec1u n\u00e0y x\u1ea3y ra v\u1edbi m\u1ecdi y\u00eau c\u1ea7u, v\u00e0 \u0111\u00e2y l\u00e0 vi\u1ec7c l\u00e3ng ph\u00ed hi\u1ec7u su\u1ea5t r\u1ea5t l\u1edbn n\u1ebfu n\u1ed9i dung c\u1ee7a trang kh\u00f4ng thay \u0111\u1ed5i. M\u1ed9t y\u00eau c\u1ea7u \u0111i\u1ec3n h\u00ecnh tr\u00f4ng gi\u1ed1ng nh\u01b0 th\u1ebf n\u00e0y:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/wordpress-truoc-khi-caching-1024x585.jpg\" alt=\"WordPress tr\u01b0\u1edbc khi caching\" class=\"wp-image-19244\"\/><figcaption class=\"wp-element-caption\">WordPress tr\u01b0\u1edbc khi caching<\/figcaption><\/figure><\/div>\n\n\n<p>Ch\u00fa th\u00edch:<\/p>\n\n\n\n<ul>\n<li>User: ng\u01b0\u1eddi d\u00f9ng.<\/li>\n\n\n\n<li>Web server: m\u00e1y ch\u1ee7 web.<\/li>\n\n\n\n<li>PHP: ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh PHP.<\/li>\n\n\n\n<li>Database: c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n\n\n\n<li>Speed scale: thang \u0111o t\u1ed1c \u0111\u1ed9, fast (nhanh), slow (ch\u1eadm).<\/li>\n<\/ul>\n\n\n\n<p>Nh\u01b0 m\u1ed9t quy t\u1eafc chung, c\u00e0ng c\u00f3 nhi\u1ec1u th\u00e0nh ph\u1ea7n \u0111\u1ed9ng li\u00ean quan \u0111\u1ebfn vi\u1ec7c x\u1eed l\u00fd m\u1ed9t y\u00eau c\u1ea7u, ng\u01b0\u1eddi d\u00f9ng c\u00e0ng ph\u1ea3i \u0111\u1ee3i l\u00e2u v\u00e0 t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng c\u00e0ng b\u1ecb d\u00f9ng nhi\u1ec1u h\u01a1n. \u0110\u1ec3 ch\u1ed1ng l\u1ea1i \u0111i\u1ec1u n\u00e0y, cache th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong nhi\u1ec1u l\u1edbp, t\u1eebng layer (l\u1edbp) \u0111\u1ee9ng ngay tr\u01b0\u1edbc ph\u1ea7n \u0111\u1ed9ng. Ba l\u1edbp n\u1ed5i b\u1eadt trong WordPress th\u01b0\u1eddng \u0111\u01b0\u1ee3c chia th\u00e0nh:<\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/kiencang.net\/bo-nho-dem-trinh-duyet\/\" target=\"_blank\" rel=\"noreferrer noopener\">Cache ph\u00eda tr\u00ecnh duy\u1ec7t \/ Browser cache<\/a>.<\/li>\n\n\n\n<li>Cache trang \/ Page cache.<\/li>\n\n\n\n<li>Cache \u0111\u1ed1i t\u01b0\u1ee3ng \/ Object cache.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"585\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/wordpress-sau-cache-1024x585.jpg\" alt=\"C\u00e1c l\u1edbp cache c\u1ee7a WordPress\" class=\"wp-image-19245\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/wordpress-sau-cache-1024x585.jpg 1024w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/wordpress-sau-cache-300x171.jpg 300w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/wordpress-sau-cache-768x439.jpg 768w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/wordpress-sau-cache-1536x878.jpg 1536w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/wordpress-sau-cache.jpg 1540w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">C\u00e1c l\u1edbp cache c\u1ee7a WordPress<\/figcaption><\/figure><\/div>\n\n\n<p>H\u00e3y \u0111i s\u00e2u v\u00e0o t\u1eebng l\u1edbp. Ch\u00fang ta s\u1ebd l\u00e0m vi\u1ec7c n\u00e0y t\u1eeb ngo\u00e0i v\u00e0o trong, \u0111\u1ea7u ti\u00ean l\u00e0 cache ph\u00eda tr\u00ecnh duy\u1ec7t.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"cache-phia-trinh-duy\u1ec7t\"><span class=\"ez-toc-section\" id=\"3_Cache_phia_trinh_duyet\"><\/span>#3. Cache ph\u00eda tr\u00ecnh duy\u1ec7t<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u1eb7c d\u00f9&nbsp;<a href=\"https:\/\/kiencang.net\/bo-nho-dem-trinh-duyet\/\" target=\"_blank\" rel=\"noreferrer noopener\">cache ph\u00eda tr\u00ecnh duy\u1ec7t<\/a>&nbsp;kh\u00f4ng nh\u1ea5t thi\u1ebft gi\u00fap c\u1ea3i thi\u1ec7n th\u1eddi gian \u0111\u00e1p \u1ee9ng c\u1ee7a \u1ee9ng d\u1ee5ng ho\u1eb7c kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i (\u00edt nh\u1ea5t trong v\u01b0\u01a1ng qu\u1ed1c c\u1ee7a WordPress), n\u00f3 v\u1eabn l\u00e0 l\u1edbp quan tr\u1ecdng nh\u1ea5t khi n\u00f3i \u0111\u1ebfn vi\u1ec7c gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng d\u1eef li\u1ec7u c\u1ea7n ph\u1ea3i g\u1eedi \u0111i t\u1eeb m\u00e1y ch\u1ee7 \u0111\u1ebfn tr\u00ecnh duy\u1ec7t. <\/p>\n\n\n\n<p>\u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 gi\u00fap ng\u01b0\u1eddi d\u00f9ng c\u1ea3m th\u1ea5y trang c\u1ee7a b\u1ea1n ph\u1ea3n h\u1ed3i nhanh h\u01a1n b\u1edfi v\u00ec c\u00e1c t\u00e0i nguy\u00ean t\u0129nh nh\u01b0 l\u00e0 CSS, JS v\u00e0 \u1ea3nh xu\u1ea5t hi\u1ec7n nhanh h\u01a1n n\u1ebfu ch\u00fang \u0111\u01b0\u1ee3c cache b\u1edfi tr\u00ecnh duy\u1ec7t.<\/p>\n\n\n\n<p>Khi mu\u1ed1n t\u00ecm hi\u1ec3u v\u1ec1 b\u1ed9 nh\u1edb \u0111\u1ec7m tr\u00ecnh duy\u1ec7t, tab Network trong&nbsp;<strong>b\u1ed9 c\u00f4ng c\u1ee5 cho nh\u00e0 ph\u00e1t tri\u1ec3n<\/strong>&nbsp;(DevTools) tr\u00ean tr\u00ecnh duy\u1ec7t Chrome l\u00e0 ng\u01b0\u1eddi b\u1ea1n th\u00e2n thi\u1ebft c\u1ee7a ch\u00fang ta.&nbsp;H\u00e3y xem b\u1ed9 nh\u1edb \u0111\u1ec7m tr\u00ecnh duy\u1ec7t ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o, b\u1eb1ng c\u00e1ch t\u1ea3i website (v\u00ed d\u1ee5, ch\u00ednh trang b\u1ea1n \u0111ang \u0111\u1ecdc, Ki\u1ebfn c\u00e0ng). L\u1ea7n t\u1ea3i \u0111\u1ea7u ti\u00ean kh\u00f4ng c\u00f3 b\u1ea5t c\u1ee9 th\u00e0nh ph\u1ea7n n\u00e0o \u0111\u01b0\u1ee3c cache b\u1edfi tr\u00ecnh duy\u1ec7t (t\u00f4i b\u1eadt t\u00ednh n\u0103ng \u201cdisable cache\u201d \u0111\u1ec3 gi\u1ea3 l\u1eadp l\u01b0\u1ee3t t\u1ea3i l\u1ea7n \u0111\u1ea7u).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/tai-web-lan-dau-a-1.png\" alt=\"t\u1ea3i web l\u1ea7n \u0111\u1ea7u\" class=\"wp-image-19252\"\/><figcaption class=\"wp-element-caption\">T\u1ea3i web l\u1ea7n \u0111\u1ea7u<\/figcaption><\/figure><\/div>\n\n\n<p>C\u00e1c th\u00f4ng s\u1ed1 m\u00e0 ch\u00fang ta \u0111\u1eb7c bi\u1ec7t quan t\u00e2m l\u00e0 s\u1ed1&nbsp;<em>l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u01b0u chuy\u1ec3n<\/em>&nbsp;v\u00e0&nbsp;<em>t\u1ed5ng l\u01b0\u1ee3ng t\u00e0i nguy\u00ean<\/em>.<\/p>\n\n\n\n<ul>\n<li>824 KB \/ 1,3 MB \u0111\u01b0\u1ee3c l\u01b0u chuy\u1ec3n \/ transferred.<\/li>\n\n\n\n<li>2,2&nbsp; \/ 2,7 MB t\u00e0i nguy\u00ean \/ resources.<\/li>\n<\/ul>\n\n\n\n<p>\u0110\u1ea7u ti\u00ean, l\u01b0u \u00fd r\u1eb1ng m\u1ed7i th\u00f4ng s\u1ed1 c\u00f3 hai gi\u00e1 tr\u1ecb (824 KB \/ 1,3 MB) v\u00ec b\u1ea1n c\u00f3 th\u1ec3 l\u1ecdc k\u1ebft qu\u1ea3 theo lo\u1ea1i t\u00e0i nguy\u00ean. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p b\u1ea1n d\u1ec5 d\u00e0ng th\u1ea5y \u0111\u01b0\u1ee3c lo\u1ea1i t\u00e0i nguy\u00ean n\u00e0o chi\u1ebfm ph\u1ea7n l\u1edbn b\u0103ng th\u00f4ng. V\u00ed d\u1ee5 \u1edf \u0111\u00e2y l\u00e0 CSS:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"717\" height=\"378\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/thanh-pha-tai-2.png\" alt=\"th\u00e0nh ph\u1ea7n t\u1ea3i\" class=\"wp-image-19253\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/thanh-pha-tai-2.png 717w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/thanh-pha-tai-2-300x158.png 300w\" sizes=\"(max-width: 717px) 100vw, 717px\" \/><figcaption class=\"wp-element-caption\">Th\u00e0nh ph\u1ea7n t\u1ea3i<\/figcaption><\/figure><\/div>\n\n\n<p>Th\u1ef1c ra, \u1ea3nh c\u1ee7a b\u00e0i vi\u1ebft tr\u00ean m\u1edbi l\u00e0 c\u00e1i chi\u1ebfm nhi\u1ec1u nh\u1ea5t, nh\u01b0ng t\u00f4i \u0111ang \u0111\u1ec3&nbsp;<a href=\"https:\/\/kiencang.net\/lazy-load-anh-va-video\/\" target=\"_blank\" rel=\"noreferrer noopener\">lazy load \u1ea3nh<\/a>&nbsp;n\u00ean b\u1ea1n kh\u00f4ng th\u1ea5y, khi t\u1ea3i \u0111\u1ea7y \u0111\u1ee7, n\u00f3 s\u1ebd tr\u00f4ng nh\u01b0 b\u00ean d\u01b0\u1edbi (\u1ea3nh chi\u1ebfm 1,5 MB tr\u00ean t\u1ed5ng s\u1ed1 2,2 MB d\u1eef li\u1ec7u l\u01b0u chuy\u1ec3n):<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"717\" height=\"430\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/dung-luong-cua-anh-3.png\" alt=\"dung l\u01b0\u1ee3ng c\u1ee7a \u1ea3nh\" class=\"wp-image-19251\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/dung-luong-cua-anh-3.png 717w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/dung-luong-cua-anh-3-300x180.png 300w\" sizes=\"(max-width: 717px) 100vw, 717px\" \/><figcaption class=\"wp-element-caption\">Dung l\u01b0\u1ee3ng c\u1ee7a \u1ea3nh<\/figcaption><\/figure><\/div>\n\n\n<p>\u0110i\u1ec1u th\u1ee9 hai c\u1ea7n \u0111\u1ec3 \u00fd l\u00e0, gi\u00e1 tr\u1ecb l\u01b0u chuy\u1ec3n ph\u1ea3i lu\u00f4n lu\u00f4n nh\u1ecf h\u01a1n so v\u1edbi t\u1ed5ng gi\u00e1 tr\u1ecb t\u00e0i nguy\u00ean, th\u1eadm ch\u00ed ngay c\u1ea3 trong l\u1ea7n t\u1ea3i \u0111\u1ea7u ti\u00ean b\u1edfi tr\u00ecnh duy\u1ec7t (ho\u1eb7c khi t\u00ednh n\u0103ng \u201cv\u00f4 hi\u1ec7u h\u00f3a cache\u201d \u0111\u01b0\u1ee3c b\u1eadt), c\u00f3 hai l\u00fd do cho \u0111i\u1ec1u n\u00e0y:<\/p>\n\n\n\n<ol>\n<li>C\u00e1c d\u1eef li\u1ec7u (th\u00e0nh ph\u1ea7n) l\u01b0u trong b\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t kh\u00f4ng c\u1ea7n t\u1ea3i qua m\u1ea1ng (l\u01b0u chuy\u1ec3n).<\/li>\n\n\n\n<li>C\u00e1c d\u1eef li\u1ec7u (th\u00e0nh ph\u1ea7n) nh\u01b0 l\u00e0 HTML, CSS v\u00e0 JS \u0111\u01b0\u1ee3c n\u00e9n b\u1edfi m\u00e1y ch\u1ee7 tr\u01b0\u1edbc khi \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ebfn cho tr\u00ecnh duy\u1ec7t. Ch\u00fang sau \u0111\u00f3 \u0111\u01b0\u1ee3c gi\u1ea3i n\u00e9n b\u1edfi tr\u00ecnh duy\u1ec7t tr\u01b0\u1edbc khi hi\u1ec3n th\u1ecb \u0111\u1ebfn ng\u01b0\u1eddi d\u00f9ng (m\u1ed9t s\u1ed1 ki\u1ec3u n\u00e9n ph\u1ed5 bi\u1ebfn l\u00e0 <a href=\"https:\/\/kiencang.net\/bat-nen-gzip\/\" target=\"_blank\" rel=\"noreferrer noopener\">gzip<\/a> v\u00e0&nbsp;<a href=\"https:\/\/kiencang.net\/nen-brotli-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">brotli<\/a>).<\/li>\n<\/ol>\n\n\n\n<p>V\u00ec l\u00fd do \u0111\u00f3, n\u1ebfu cache tr\u00ecnh duy\u1ec7t \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh ch\u00ednh x\u00e1c, th\u00ec \u1edf nh\u1eefng l\u1ea7n t\u1ea3i sau, d\u1eef li\u1ec7u l\u01b0u chuy\u1ec3n s\u1ebd \u00edt \u0111i. B\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y \u0111i\u1ec1u n\u00e0y khi th\u1eed t\u1ea3i l\u1ea1i trang.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"721\" height=\"382\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/du-lieu-luu-chuyen-4.png\" alt=\"d\u1eef li\u1ec7u l\u01b0u chuy\u1ec3n\" class=\"wp-image-19250\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/du-lieu-luu-chuyen-4.png 721w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/du-lieu-luu-chuyen-4-300x159.png 300w\" sizes=\"(max-width: 721px) 100vw, 721px\" \/><figcaption class=\"wp-element-caption\">D\u1eef li\u1ec7u l\u01b0u chuy\u1ec3n khi \u0111\u01b0\u1ee3c cache tr\u00ecnh duy\u1ec7t<\/figcaption><\/figure><\/div>\n\n\n<p>D\u1eef li\u1ec7u l\u01b0u chuy\u1ec3n gi\u1ea3m t\u1eeb 824 KB xu\u1ed1ng 34,6 KB, \u0111\u00e2y l\u00e0 l\u01b0\u1ee3ng d\u1eef li\u1ec7u ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c r\u1ea5t l\u1edbn (h\u01a1n 95%)! Th\u1eddi gian t\u1ea3i trong v\u00ed d\u1ee5 n\u00e0y kh\u00f4ng gi\u1ea3m xu\u1ed1ng \u0111\u00e1ng k\u1ec3 v\u00ec lazy load image \u0111\u00e3 h\u1ed7 tr\u1ee3 gi\u1ea3m t\u1ea3i nhi\u1ec1u.<\/p>\n\n\n\n<p>H\u00e0nh vi c\u1ee7a b\u1ed9 nh\u1edb \u0111\u1ec7m tr\u00ecnh duy\u1ec7t \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1edfi 2 headers l\u00e0&nbsp;<a href=\"https:\/\/kiencang.net\/http-caching-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em>cache-control<\/em>&nbsp;v\u00e0&nbsp;<em>expires<\/em><\/a>\u2013&nbsp;c\u00e1i \u0111\u01b0\u1ee3c b\u1ed5 sung v\u00e0o ph\u1ea3n h\u1ed3i c\u1ee7a t\u00e0i nguy\u00ean t\u0129nh b\u1edfi m\u00e1y ch\u1ee7 c\u1ee7a b\u1ea1n. Header&nbsp;<em>cache-control<\/em>&nbsp;s\u1ebd \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n header&nbsp;<em>expires<\/em>. Nh\u01b0ng c\u1ea3 hai th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u01b0\u01a1ng th\u00edch v\u1edbi m\u1ed9t s\u1ed1 d\u1ecbch v\u1ee5 proxy (CDN).<\/p>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m tra header c\u1ee7a t\u00e0i nguy\u00ean b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng b\u1ed9 c\u00f4ng c\u1ee5 cho nh\u00e0 ph\u00e1t tri\u1ec3n (developer tools), ho\u1eb7c s\u1eed d\u1ee5ng&nbsp;<a href=\"https:\/\/curl.haxx.se\/docs\/manpage.html\" target=\"_blank\" rel=\"noreferrer noopener\">cURL command<\/a>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"428\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/cache-control-anh-5.png\" alt=\"cache control\" class=\"wp-image-19248\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/cache-control-anh-5.png 720w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/cache-control-anh-5-300x178.png 300w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">Cache control<\/figcaption><\/figure><\/div>\n\n\n<p>Th\u00f4ng th\u01b0\u1eddng, header&nbsp;<em>cache-control<\/em>&nbsp;s\u1ebd c\u00f3 gi\u00e1 tr\u1ecb n\u1eb1m \u1edf ph\u1ea7n&nbsp;<code>max-age=&lt;second&gt;<\/code><em>,&nbsp;<\/em>n\u00f3&nbsp;s\u1ebd h\u01b0\u1edbng d\u1eabn tr\u00ecnh duy\u1ec7t bi\u1ebft \u0111\u01b0\u1ee3c c\u1ea7n ph\u1ea3i cache file \u0111\u00f3 trong th\u1eddi gian t\u1ed1i \u0111a l\u00e0 bao nhi\u00eau gi\u00e2y v\u00e0 ng\u0103n n\u00f3 kh\u00f4ng t\u1ea3i l\u1ea1i trong c\u00e1c y\u00eau c\u1ea7u ti\u1ebfp theo. Trong tr\u01b0\u1eddng h\u1ee3p tr\u00ean, file s\u1ebd \u0111\u01b0\u1ee3c cache trong tr\u00ecnh duy\u1ec7t 1 n\u0103m (\u0111\u00e2y l\u00e0 th\u1eddi gian t\u1ed1i \u0111a, v\u00e0 th\u01b0\u1eddng \u00e1p d\u1ee5ng cho c\u00e1c t\u00e0i nguy\u00ean r\u1ea5t \u00edt khi thay \u0111\u1ed5i, v\u00ed d\u1ee5 nh\u01b0 \u1ea3nh, \u00e2m thanh, video).<\/p>\n\n\n\n<p>PS: N\u1ebfu b\u1ea1n mu\u1ed1n hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 header Cache-Control \u0111\u1ec3 cache ph\u00eda m\u00e1y kh\u00e1ch, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o b\u00e0i vi\u1ebft&nbsp;<a href=\"https:\/\/kiencang.net\/tim-hieu-http-caching\/\" target=\"_blank\" rel=\"noreferrer noopener\">T\u00ecm hi\u1ec3u s\u00e2u v\u1ec1 HTTP Caching<\/a>.<\/p>\n\n\n\n<p id=\"m\u1ed9t-vai-di\u1ec1u-quan-tr\u1ecdng-c\u1ea7n-bi\u1ebft\">M\u1ed9t v\u00e0i \u0111i\u1ec1u quan tr\u1ecdng c\u1ea7n bi\u1ebft:<\/p>\n\n\n\n<ol>\n<li><strong>V\u00f4 hi\u1ec7u h\u00f3a b\u1ed9 \u0111\u1ec7m l\u00e0 kh\u00f3 kh\u0103n<\/strong>. M\u1ed9t khi tr\u00ecnh duy\u1ec7t \u0111\u00e3 cache th\u00e0nh ph\u1ea7n n\u00e0o \u0111\u00f3 s\u1eed d\u1ee5ng cache-control: <code>max-age=&lt;seconds&gt;<\/code> b\u1ea1n kh\u00f4ng th\u1ec3 n\u00f3i v\u1edbi tr\u00ecnh duy\u1ec7t kh\u00f4ng cache n\u00f3, \u00edt nh\u1ea5t khi kh\u00f4ng thay \u0111\u1ed5i URL. \u0110\u00e2y l\u00e0 l\u00fd do&nbsp;<a href=\"https:\/\/kiencang.net\/css-wordpress-version\/\" target=\"_blank\" rel=\"noreferrer noopener\">v\u00ec sao WordPress th\u00eam m\u1ed9t chu\u1ed7i query phi\u00ean b\u1ea3n v\u00e0o c\u00e1c t\u00e0i nguy\u00ean<\/a>&nbsp;(\u0111\u1ec3 t\u00e0i nguy\u00ean m\u1edbi c\u1eadp nh\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, ch\u1ee9 kh\u00f4ng d\u00f9ng t\u00e0i nguy\u00ean c\u0169 \u0111\u01b0\u1ee3c cache trong b\u1ed9 nh\u1edb \u0111\u1ec7m tr\u00ecnh duy\u1ec7t). L\u1ea5y v\u00ed d\u1ee5:&nbsp;<code>https:\/\/kiengcang.net\/wp\/wp-includes\/css\/dashicons.min.css?ver=5.2.2<\/code><\/li>\n\n\n\n<li><strong>C\u00e1c c\u00f4ng c\u1ee5 ki\u1ec3m tra t\u1ed1c \u0111\u1ed9 website nh\u01b0&nbsp;<a href=\"https:\/\/kiencang.net\/huong-dan-su-dung-pingdom\/\" target=\"_blank\" rel=\"noreferrer noopener\">Pingdom<\/a>&nbsp;s\u1ebd than phi\u1ec1n v\u1ec1 header c\u00f3 th\u1eddi gian h\u1ebft h\u1ea1n ng\u1eafn<\/strong>.&nbsp;Th\u00f4ng th\u01b0\u1eddng, nh\u1eefng c\u1ea3nh b\u00e1o n\u00e0y \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1edfi c\u00e1c th\u00e0nh ph\u1ea7n nh\u01b0 l\u00e0 Google Analytics \u0111\u01b0\u1ee3c g\u1eafn v\u00e0o trong website c\u1ee7a b\u1ea1n. \u0110i\u1ec1u n\u00e0y l\u00e0 b\u1edfi c\u00e1c d\u1ecbch v\u1ee5 b\u00ean ngo\u00e0i s\u1eed d\u1ee5ng th\u1eddi gian h\u1ebft h\u1ea1n ng\u1eafn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u00e0i nguy\u00ean c\u1ee7a h\u1ecd \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt nhanh nh\u1ea5t, do c\u00f3 kh\u00f3 kh\u0103n v\u1ec1 vi\u1ec7c v\u00f4 hi\u1ec7u h\u00f3a b\u1ed9 \u0111\u1ec7m.<\/li>\n\n\n\n<li><strong>C\u00e1c header cache-control v\u00e0 expires kh\u00f4ng ph\u1ea3i l\u00e0 nh\u1eefng header duy nh\u1ea5t m\u00e0 tr\u00ecnh duy\u1ec7t s\u1eed d\u1ee5ng&nbsp;<\/strong>\u0111\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c r\u1eb1ng t\u00e0i nguy\u00ean c\u00f3 c\u1ea7n l\u1ea5y t\u1eeb m\u00e1y ch\u1ee7 hay kh\u00f4ng. L\u1ea5y v\u00ed d\u1ee5, khi th\u1eddi l\u01b0\u1ee3ng c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh b\u1edfi <code>cache-control: max-age&lt;seconds&gt;<\/code> tr\u00f4i qua th\u00ec ti\u00eau \u0111\u1ec1 etag s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.&nbsp;N\u00f3 ch\u1ee9a m\u00e3 th\u00f4ng b\u00e1o x\u00e1c th\u1ef1c (t\u01b0\u01a1ng t\u1ef1 v\u1edbi MD5 hash c\u1ee7a t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u). N\u1ebfu gi\u00e1 tr\u1ecb etag gi\u1eef nguy\u00ean, t\u00e0i nguy\u00ean tr\u1ea3 v\u1ec1 ph\u1ea3n h\u1ed3i \u201c304 v\u1eabn ch\u01b0a s\u1eeda \u0111\u1ed5i\u201d. \u0110i\u1ec1u n\u00e0y n\u00f3i v\u1edbi tr\u00ecnh duy\u1ec7t r\u1eb1ng t\u00e0i nguy\u00ean cache kh\u00f4ng thay \u0111\u1ed5i v\u00e0 n\u00f3 s\u1ebd \u0111\u01b0\u1ee3c gia h\u1ea1n th\u1eddi gian h\u1ebft h\u1ea1n ch\u1ec9 \u0111\u1ecbnh trong <code>cache-control: max-age=&lt;seconds&gt;<\/code>.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"page-cache\"><span class=\"ez-toc-section\" id=\"4_Page_Cache\"><\/span>#4. Page Cache<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Page Cache s\u1ebd \u0111em l\u1ea1i cho b\u1ea1n nhi\u1ec1u l\u1ee3i \u00edch nh\u1ea5t khi \u0111\u1ec1 c\u1eadp \u0111\u1ebfn vi\u1ec7c c\u1ea3i thi\u1ec7n th\u1eddi gian ph\u1ea3n h\u1ed3i v\u00e0 ch\u1ecbu t\u1ea3i trong WordPress. B\u1ed9 \u0111\u1ec7m trang (page cache) v\u1ec1 c\u01a1 b\u1ea3n bi\u1ebfn WordPress (m\u1ed9t CMS d\u1ef1a tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u) th\u00e0nh trang HTML t\u0129nh b\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf c\u1ea3 PHP v\u00e0 MySQL ra ngo\u00e0i khi x\u1eed l\u00fd y\u00eau c\u1ea7u.<\/p>\n\n\n\n<p>\u0110\u1ec3 ch\u1ee9ng minh t\u1ea7m quan tr\u1ecdng m\u00e0 b\u1ed9 nh\u1edb \u0111\u1ec7m trang c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c, t\u00f4i ti\u1ebfn h\u00e0nh ki\u1ec3m tra (benchmark) m\u1ed9t b\u1ea3n c\u00e0i \u0111\u1eb7t WordPress 5.2.2 s\u1eed d\u1ee5ng ApacheBench. Trong c\u00e1c th\u1eed nghi\u1ec7m n\u00e0y t\u00f4i s\u1eed d\u1ee5ng&nbsp;<a href=\"https:\/\/spinupwp.com\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">SpinupWP<\/a>&nbsp;k\u1ebft h\u1ee3p v\u1edbi&nbsp;<a href=\"https:\/\/spinupwp.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">DigitalOcean Droplet 8GB, 4vCPUs<\/a>&nbsp;\u0111\u1ec3 l\u00e0m hosting WordPress.&nbsp;C\u00e1c k\u1ebft qu\u1ea3 kh\u00f4ng cache l\u00e0 cho WordPress kh\u00f4ng \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh cache (ngo\u1ea1i tr\u1eeb PHP OPcache, s\u1eed d\u1ee5ng c\u00e1c gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh trong PHP 7.3). C\u00e1c k\u1ebft qu\u1ea3 cache l\u00e0 cho trang khi SpinupWP one-click \u0111\u01b0\u1ee3c b\u1eadt.<\/p>\n\n\n\n<p>H\u00e3y b\u1eaft \u0111\u1ea7u v\u1edbi s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u tr\u00ean m\u1ed7i gi\u00e2y (cao h\u01a1n th\u00ec t\u1ed1t h\u01a1n), \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p>N\u00f3 l\u00e0m t\u0103ng kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i c\u1ee7a \u1ee9ng d\u1ee5ng. N\u00f3i c\u00e1ch kh\u00e1c, trang web c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 x\u1eed l\u00fd nhi\u1ec1u l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp (traffic) h\u01a1n.<\/p>\n<\/blockquote>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/trang-cache-request-6-1024x685.png\" alt=\"s\u1ed1 l\u01b0\u1ee3ng request\" class=\"wp-image-19254\"\/><figcaption class=\"wp-element-caption\">So s\u00e1nh s\u1ed1 l\u01b0\u1ee3ng request<\/figcaption><\/figure><\/div>\n\n\n<p>S\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u tr\u00ean m\u1ed7i gi\u00e2y kh\u00e1c nhau \u0111\u1ebfn 10 l\u1ea7n, \u0111i\u1ec1u n\u00e0y th\u1eadt tuy\u1ec7t v\u1eddi! Nh\u01b0ng s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u cao m\u1ed7i gi\u00e2y kh\u00f4ng c\u00f3 \u00fd ngh\u0129a g\u00ec nhi\u1ec1u n\u1ebfu c\u00e1c y\u00eau c\u1ea7u n\u00e0y m\u1ea5t nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 ho\u00e0n th\u00e0nh. \u0110\u1ea5y l\u00e0 l\u00fd do t\u1ea1i sao \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 \u0111o c\u1ea3 th\u1eddi gian ph\u1ea3n h\u1ed3i trung b\u00ecnh (th\u1ea5p h\u01a1n th\u00ec t\u1ed1t h\u01a1n), \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p>N\u00f3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a \u1ee9ng d\u1ee5ng. N\u00f3i c\u00e1ch kh\u00e1c, v\u1edbi website WordPress, trang c\u1ee7a b\u1ea1n t\u1ea3i nhanh h\u01a1n.<\/p>\n<\/blockquote>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/caching-thoi-gian-phan-hoi-7-1024x686.png\" alt=\"So s\u00e1nh th\u1eddi gian ph\u1ea3n h\u1ed3i\" class=\"wp-image-19249\"\/><figcaption class=\"wp-element-caption\">So s\u00e1nh th\u1eddi gian ph\u1ea3n h\u1ed3i<\/figcaption><\/figure><\/div>\n\n\n<p>Th\u1eddi gian ph\u1ea3n h\u1ed3i trung b\u00ecnh gi\u1ea3m m\u1ed9t n\u1eeda khi cache trang \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh, \u0111i\u1ec1u n\u00e0y l\u00e0 r\u1ea5t \u0111\u00e1ng ch\u00fa \u00fd khi ch\u00fang ta bi\u1ebft r\u1eb1ng trong t\u00ecnh hu\u1ed1ng n\u00e0y s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u t\u0103ng l\u00ean g\u1ea5p 10 l\u1ea7n m\u1ed7i gi\u00e2y.<\/p>\n\n\n\n<p id=\"m\u1ed9t-s\u1ed1-di\u1ec3m-c\u1ea7n-l\u01b0u-y\">M\u1ed9t s\u1ed1 \u0111i\u1ec3m c\u1ea7n l\u01b0u \u00fd:<\/p>\n\n\n\n<ol>\n<li><strong>Page cache l\u00e0 v\u00f4 c\u00f9ng kh\u00f3 kh\u0103n khi website hi\u1ec3n th\u1ecb th\u00f4ng tin c\u00e1 nh\u00e2n h\u00f3a<\/strong>, ch\u1eb3ng h\u1ea1n nh\u01b0 tr\u00ean trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed ho\u1eb7c m\u1ed9t trang c\u00f3 t\u00ednh \u0111\u1ed9ng cao nh\u01b0 forum (di\u1ec5n \u0111\u00e0n). Th\u01b0\u1eddng th\u00ec page cache s\u1ebd c\u1ea7n v\u00f4 hi\u1ec7u h\u00f3a ho\u00e0n to\u00e0n ho\u1eb7c c\u00e1c trang \u0111\u1eb7c bi\u1ec7t nh\u01b0 trang thanh to\u00e1n s\u1ebd c\u1ea7n ph\u1ea3i b\u1ecf qua, kh\u00f4ng cho ph\u00e9p cache.<\/li>\n\n\n\n<li><strong>V\u00f4 hi\u1ec7u h\u00f3a b\u1ed9 nh\u1edb cache c\u00f3 th\u1ec3 kh\u00f3 kh\u0103n t\u00f9y thu\u1ed9c v\u00e0o c\u00e1ch n\u00f3 \u0111\u01b0\u1ee3c tri\u1ec3n khai<\/strong>. Do t\u00ednh ch\u1ea5t n\u0103ng \u0111\u1ed9ng c\u1ee7a WordPress, n\u00f3 kh\u00f3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c trang n\u00e0o c\u1ea7n ph\u1ea3i x\u00f3a kh\u1ecfi b\u1ed9 nh\u1edb \u0111\u1ec7m khi n\u1ed9i dung \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt (\u0111\u1eb7c bi\u1ec7t l\u00e0 khi c\u00e1c trang l\u01b0u tr\u1eef (v\u00ed d\u1ee5 th\u01b0 m\u1ee5c, tag), ph\u00e2n trang v\u00e0 widget c\u00f3 li\u00ean quan \u0111\u1ebfn chuy\u1ec7n n\u00e0y). \u0110\u00e2y l\u00e0 l\u00fd do v\u00ec sao x\u00f3a to\u00e0n b\u1ed9 n\u1ed9i dung kh\u1ecfi b\u1ed9 nh\u1edb \u0111\u1ec7m th\u01b0\u1eddng l\u00e0 c\u00e1ch ti\u1ebfp c\u1eadn \u0111\u01b0\u1ee3c \u01b0a th\u00edch khi n\u1ed9i dung thay \u0111\u1ed5i.<\/li>\n\n\n\n<li><strong>S\u1eed d\u1ee5ng nhi\u1ec1u bi\u1ec7n ph\u00e1p page cache c\u00f9ng l\u00fac kh\u00f4ng gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t<\/strong>. Trong th\u1ef1c t\u1ebf, c\u00f3 nhi\u1ec1u gi\u1ea3i ph\u00e1p page cache c\u00f9ng l\u00fac \u0111\u01b0\u1ee3c tri\u1ec3n khai s\u1ebd g\u00e2y phi\u1ec1n to\u00e1i b\u1edfi v\u00ec n\u00f3 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00ednh kh\u00f4ng li\u00ean t\u1ee5c c\u1ee7a b\u1ed9 nh\u1edb cache (c\u00e1c phi\u00ean b\u1ea3n kh\u00e1c nhau c\u1ee7a website \u0111\u01b0\u1ee3c l\u01b0u tr\u00ean t\u1eebng phi\u00ean b\u1ea3n cache) v\u00e0 l\u00e0m cho vi\u1ec7c v\u00f4 hi\u1ec7u h\u00f3a cache tr\u1edf n\u00ean r\u1ed1i r\u1eafm.<\/li>\n\n\n\n<li><strong>Page cache th\u01b0\u1eddng \u0111\u01b0\u1ee3c v\u00f4 hi\u1ec7u h\u00f3a v\u1edbi ng\u01b0\u1eddi d\u00f9ng \u0111\u0103ng nh\u1eadp<\/strong>, \u0111\u00e2y l\u00e0 l\u00fd do v\u00ec sao object cache (c\u00e1i s\u1ebd \u0111\u01b0\u1ee3c n\u00f3i \u1edf ph\u1ea7n b\u00ean d\u01b0\u1edbi) v\u1eabn \u0111\u01b0\u1ee3c khuy\u1ebfn kh\u00edch d\u00f9ng.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"object-caching\"><span class=\"ez-toc-section\" id=\"5_Object_Caching\"><\/span>#5. Object Caching<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp \u1edf ph\u1ea7n tr\u00ean, kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c trang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c cache. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t \u0111\u00fang v\u1edbi c\u00e1c trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed v\u00e0 c\u00e1c trang cho ph\u00e9p \u0111\u0103ng k\u00fd th\u00e0nh vi\u00ean, n\u01a1i ch\u00fang th\u01b0\u1eddng hi\u1ec3n th\u1ecb th\u00f4ng tin \u0111\u01b0\u1ee3c c\u00e1 nh\u00e2n h\u00f3a. N\u00f3 c\u0169ng \u0111\u00fang v\u1edbi khu v\u1ef1c qu\u1ea3n tr\u1ecb c\u1ee7a WordPress. N\u1ebfu c\u00e1c trang \u0111\u1ed9ng nh\u01b0 v\u1eady \u0111\u01b0\u1ee3c cache, ng\u01b0\u1eddi&nbsp;d\u00f9ng s\u1ebd th\u1ea5y c\u00e1c n\u1ed9i dung c\u00e1 nh\u00e2n h\u00f3a kh\u00f4ng li\u00ean quan \u0111\u1ebfn h\u1ecd.<\/p>\n\n\n\n<p>WordPress c\u00f3 object cache \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng s\u1eb5n b\u00ean trong (bulit-in), cho ph\u00e9p th\u00f4ng tin nh\u01b0 c\u00e1c truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong b\u1ed9 nh\u1edb. \u0110\u00e2y l\u00e0 nguy\u00ean nh\u00e2n m\u00e0 d\u00f9 c\u00f3 nhi\u1ec1u l\u1ec7nh g\u1ecdi \u0111\u1ebfn c\u00e1c h\u00e0m nh\u01b0&nbsp;<em>get_posts,&nbsp;<\/em>nh\u01b0ng n\u00f3 ch\u1ec9 d\u1eabn \u0111\u1ebfn m\u1ed9t truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u (nh\u1eefng l\u1eddi g\u1ecdi kh\u00e1c \u0111\u00e3 \u0111\u01b0\u1ee3c cache). <\/p>\n\n\n\n<p>M\u1eb7c d\u00f9 v\u1eady, object cache kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ea1o li\u00ean t\u1ee5c theo m\u1eb7c \u0111\u1ecbnh (ngh\u0129a l\u00e0 n\u00f3 kh\u00f4ng t\u1ed3n t\u1ea1i khi kh\u00f4ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u). May m\u1eafn l\u00e0, WordPress c\u00f3 th\u1ec3 t\u00edch h\u1ee3p v\u1edbi ph\u1ea7n m\u1ec1m d\u1eef li\u1ec7u l\u01b0u tr\u1eef li\u00ean t\u1ee5c nh\u01b0 Redis, \u0111\u00e2y l\u00e0 \u0111i\u1ec1u r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 nh\u00e2n r\u1ed9ng c\u00e1c trang \u0111\u1ed9ng. <\/p>\n\n\n\n<p>Object cache n\u1eb1m gi\u1eefa PHP v\u00e0 database (c\u01a1 s\u1edf d\u1eef li\u1ec7u) s\u1ebd t\u0103ng t\u1ed1c \u0111\u1ed9 th\u1ef1c thi PHP v\u00e0 gi\u1ea3m t\u1ea3i l\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch cache truy v\u1ea5n trong b\u1ed9 nh\u1edb. B\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y \u1ea3nh h\u01b0\u1edfng c\u1ee7a object cache b\u1eb1ng c\u00e1ch c\u00e0i \u0111\u1eb7t&nbsp;<a href=\"https:\/\/wordpress.org\/plugins\/query-monitor\/\" target=\"_blank\" rel=\"noreferrer noopener\">plugin Query Monitor<\/a>. T\u1ea3i trang gi\u1ecf h\u00e0ng tr\u00ean WooCommerce kh\u00f4ng c\u00f3 object cache \u0111\u01b0\u1ee3c b\u1eadt s\u1ebd t\u1ea1o ra 32 truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/khong-bat-object-cache-scaled-1-1024x166.png\" alt=\"kh\u00f4ng b\u1eadt object cache\" class=\"wp-image-19256\"\/><\/figure><\/div>\n\n\n<p>Khi object cache \u0111\u01b0\u1ee3c b\u1eadt, con s\u1ed1 n\u00e0y gi\u1ea3m xu\u1ed1ng ch\u1ec9 c\u00f2n 2 truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 gi\u1ea3m th\u1eddi gian t\u1ea1o trang t\u1eeb 0,085 gi\u00e2y xu\u1ed1ng c\u00f2n 0,053 gi\u00e2y:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/bat-object-cache-scaled-1-1024x166.png\" alt=\"b\u1eadt object cache\" class=\"wp-image-19258\"\/><\/figure><\/div>\n\n\n<p>C\u00e1c b\u00e0i ki\u1ec3m tra \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean n\u1ec1n PHP 7.3, WordPress 5.2.2, WooCommerce 3.6.3 v\u00e0 theme Storefront.<\/p>\n\n\n\n<p id=\"m\u1ed9t-s\u1ed1-di\u1ec3m-c\u1ea7n-l\u01b0u-y\"><strong>M\u1ed9t s\u1ed1 \u0111i\u1ec3m c\u1ea7n l\u01b0u \u00fd<\/strong>:<\/p>\n\n\n\n<ol>\n<li>Vi\u1ec7c b\u1ed5 sung th\u00eam c\u00e1c ph\u1ea7n m\u1ec1m m\u00e1y ch\u1ee7 nh\u01b0 Redis ho\u1eb7c Memcached l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ea1o object cache li\u00ean t\u1ee5c. \u0110i\u1ec1u n\u00e0y n\u00ean \u0111\u01b0\u1ee3c quan t\u00e2m \u0111\u1ec3 \u00fd n\u1ebfu b\u1ea1n \u0111ang s\u1eed d\u1ee5ng host WordPress lo\u1ea1i t\u1ed1t, ho\u1eb7c b\u1ea1n c\u00f3 th\u1ec3 t\u1ef1 c\u00e0i \u0111\u1eb7t l\u1ea5y n\u1ebfu b\u1ea1n t\u1ef1 qu\u1ea3n tr\u1ecb m\u00e1y ch\u1ee7 c\u1ee7a ri\u00eang m\u00ecnh.<\/li>\n\n\n\n<li>Object cache kh\u00f4ng lo\u1ea1i b\u1ecf ho\u00e0n to\u00e0n s\u1ef1 ph\u1ee5 thu\u1ed9c v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u, c\u00e1i th\u01b0\u1eddng l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y v\u1ea5n \u0111\u1ec1 n\u00fat th\u1eaft c\u1ed5 chai l\u1edbn nh\u1ea5t trong WordPress. L\u00fd do l\u00e0 v\u00ec c\u00e1c truy v\u1ea5n SQL \u0111\u1ec3 x\u00e2y d\u1ef1ng ch\u1ec9 m\u1ee5c post s\u1ebd lu\u00f4n lu\u00f4n \u0111\u01b0\u1ee3c th\u1ef1c thi v\u00ec k\u1ebft qu\u1ea3 kh\u00f4ng \u0111\u01b0\u1ee3c cache.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"t\u1ed5ng-k\u1ebft\"><span class=\"ez-toc-section\" id=\"6_Tong_ket\"><\/span>#6. T\u1ed5ng k\u1ebft<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>T\u00f4i m\u1edbi ch\u1ec9 l\u01b0\u1edbt qua nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u0103n b\u1ea3n v\u1ec1 cache khi n\u00f3 li\u00ean quan \u0111\u1ebfn WordPress. Hy v\u1ecdng l\u00e0 b\u1ea1n \u0111\u00e3 hi\u1ec3u r\u00f5 h\u01a1n c\u00e1ch nhi\u1ec1u l\u1edbp cache l\u00e0m vi\u1ec7c. N\u1ebfu b\u1ea1n mu\u1ed1n \u0111\u00e0o s\u00e2u, t\u00f4i khuy\u00ean b\u1ea1n \u0111\u1ecdc&nbsp;<a href=\"https:\/\/kiencang.net\/tim-hieu-http-caching\/\" target=\"_blank\" rel=\"noreferrer noopener\">b\u00e0i vi\u1ebft n\u00e0y v\u1ec1 HTTP Caching<\/a>&nbsp;\u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 cache ph\u00eda tr\u00ecnh duy\u1ec7t. M\u1ed9t trang web kh\u00e1c b\u1eb1ng ti\u1ebfng Anh l\u00e0&nbsp;<a href=\"https:\/\/www.scalewp.io\/\" target=\"_blank\" rel=\"noreferrer noopener\">WordPress as Scale<\/a>&nbsp;c\u0169ng l\u00e0 m\u1ed9t ngu\u1ed3n th\u00f4ng tin tuy\u1ec7t v\u1eddi \u0111\u1ec3 b\u1ea1n h\u1ecdc h\u1ecfi nhi\u1ec1u h\u01a1n v\u1ec1 ch\u1ee7 \u0111\u1ec1 hi\u1ec7u su\u1ea5t trong WP.<\/p>\n\n\n\n<p>B\u1ea1n v\u1eabn c\u00f2n th\u1eafc m\u1eafc ch\u01b0a \u0111\u01b0\u1ee3c gi\u1ea3i \u0111\u00e1p v\u1ec1 WordPress cache? H\u00e3y \u0111\u1eb7t c\u00e2u h\u1ecfi trong ph\u1ea7n b\u00ean d\u01b0\u1edbi nh\u00e9.<\/p>\n\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft: <a href=\"https:\/\/spinupwp.com\/wordpress-caching-all-you-need-to-know\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">WordPress Caching: All You Need To Know, t\u00e1c gi\u1ea3: Ashley Rich<\/a>, website: SpinupWP)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u00e0i n\u0103m qua khi ch\u00fang t\u00f4i th\u1ef1c hi\u1ec7n c\u00f4ng vi\u1ec7c h\u1ed7 tr\u1ee3 s\u1ea3n ph\u1ea9m c\u1ee7a m\u00ecnh t\u1ea1i&nbsp;Delicious Brains&nbsp;(\u0111\u1eb7c bi\u1ec7t v\u1edbi&nbsp;plugin WP Offload Media&nbsp;v\u00e0 g\u1ea7n \u0111\u00e2y nh\u1ea5t l\u00e0&nbsp;SpinupWP), m\u1ed9t \u0111i\u1ec1u ch\u00fang t\u00f4i th\u1ea5y r\u00f5 r\u00e0ng l\u00e0: M\u1ecdi ng\u01b0\u1eddi hi\u1ec3u sai v\u1ec1 Cache trong WordPress (v\u00e0 h\u1ec7 qu\u1ea3 l\u00e0 c\u00e1c trang ch\u1ea1y ch\u1eadm h\u01a1n so v\u1edbi n\u00f3 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":24555,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[249],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cache trong WordPress: T\u1ea5t c\u1ea3 nh\u1eefng \u0111i\u1ec1u b\u1ea1n c\u1ea7n bi\u1ebft &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/caching-trong-wordpress\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cache trong WordPress: T\u1ea5t c\u1ea3 nh\u1eefng \u0111i\u1ec1u b\u1ea1n c\u1ea7n bi\u1ebft &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"V\u00e0i n\u0103m qua khi ch\u00fang t\u00f4i th\u1ef1c hi\u1ec7n c\u00f4ng vi\u1ec7c h\u1ed7 tr\u1ee3 s\u1ea3n ph\u1ea9m c\u1ee7a m\u00ecnh t\u1ea1i&nbsp;Delicious Brains&nbsp;(\u0111\u1eb7c bi\u1ec7t v\u1edbi&nbsp;plugin WP Offload Media&nbsp;v\u00e0 g\u1ea7n \u0111\u00e2y nh\u1ea5t l\u00e0&nbsp;SpinupWP), m\u1ed9t \u0111i\u1ec1u ch\u00fang t\u00f4i th\u1ea5y r\u00f5 r\u00e0ng l\u00e0: M\u1ecdi ng\u01b0\u1eddi hi\u1ec3u sai v\u1ec1 Cache trong WordPress (v\u00e0 h\u1ec7 qu\u1ea3 l\u00e0 c\u00e1c trang ch\u1ea1y ch\u1eadm h\u01a1n so v\u1edbi n\u00f3 &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/caching-trong-wordpress\/\" \/>\n<meta property=\"og:site_name\" content=\"Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/anhducnguyen87\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-02-11T20:37:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-22T15:59:45+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kiencang.net\/wp-content\/uploads\/2022\/02\/Cache.gif\" \/>\n\t<meta property=\"og:image:width\" content=\"480\" \/>\n\t<meta property=\"og:image:height\" content=\"251\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/gif\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"15 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Cache trong WordPress: T\u1ea5t c\u1ea3 nh\u1eefng \u0111i\u1ec1u b\u1ea1n c\u1ea7n bi\u1ebft &#8226; 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