{"id":6788,"date":"2018-11-01T02:58:09","date_gmt":"2018-11-01T06:58:09","guid":{"rendered":"http:\/\/local.brightwhiz\/?p=6788"},"modified":"2021-12-08T11:23:34","modified_gmt":"2021-12-08T16:23:34","slug":"cache-control-http-headers-html-explained","status":"publish","type":"post","link":"http:\/\/local.brightwhiz\/cache-control-http-headers-html-explained\/","title":{"rendered":"How to set HTTP Headers for Cache-Control"},"content":{"rendered":"\n<p>Web developers are always finding new ways to speed up the experience for website visitors. There is one not-so-new way to add to the performance that is not quite used to its extent and that&#8217;s the Cache-control.<\/p>\n\n\n\n<p>The cache can be controlled from the server-side, from the DNS, reverse proxies, and more. However, today we will be looking at how to do this using the <a href=\"http:\/\/local.brightwhiz\/tag\/http\/\">HTTP<\/a> headers for cache control using <a href=\"http:\/\/local.brightwhiz\/tag\/html\/\">HTML<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pragma, the HTTP\/1.0 Implementation<\/h2>\n\n\n\n<p>The throwback to the days of HTTP\/1.0 that was used was the Pragma directive. Though it is no longer recommended, I have included it here for nostalgic purposes.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-markup\">&lt;meta http-equiv=&quot;pragma&quot; content=&quot;no-cache&quot;&gt;<\/code><\/pre>\n\n\n\n<p>If that is no longer recommended and even fails on various HTML validators, what is the correct way to do this?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cache-Control, the HTTP\/1.1 Implementation<\/h2>\n\n\n\n<p>With HTML5 and HTTP\/1.1, it is recommended that one used the cache-control implementations. With just a couple of changes, you are on your way to properly getting web browsers to cache your <a href=\"http:\/\/local.brightwhiz\/tag\/web\/\">web<\/a> pages.<\/p>\n\n\n\n<p>This is the HTTP\/1.1 implementation with cache-control.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-markup\">&lt;meta http-equiv=&quot;Cache-control&quot; content=&quot;public&quot;&gt;\n&lt;meta http-equiv=&quot;Cache-control&quot; content=&quot;private&quot;&gt;\n&lt;meta http-equiv=&quot;Cache-control&quot; content=&quot;no-cache&quot;&gt;\n&lt;meta http-equiv=&quot;Cache-control&quot; content=&quot;no-store&quot;&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">What Else is There to Cache-Control?<\/h2>\n\n\n\n<p>As you can see from above, the Cache-control uses meta tags. But like most meta tags, they support more than a single value for any directive and the Cache-control is no exception.<\/p>\n\n\n\n<p>In this case, the allowed values are:<\/p>\n\n\n\n<p><strong>Public:<\/strong> This states that the content may be cached in public shared caches.<br><strong>Private:<\/strong> This one hints that the content may only be cached in a private cache.<br><strong>no-Cache:<\/strong> This value hints that the content may not be cached.<br><strong>no-Store:<\/strong> Used to tell the caches that the content may be cached but not archived.<\/p>\n\n\n\n<p>There you have it. You should now be equipped enough to effectively use the HTTP headers for Cache-control.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Web developers are always finding new ways to speed up the experience for website visitors. There is one not-so-new way to add to the performance that is not quite used&#8230;<\/p>\n","protected":false},"author":1,"featured_media":6789,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,23,16],"tags":[303,304,320,471,635,636,637,638],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cache-Control HTTP Headers in HTML Pages Explained<\/title>\n<meta name=\"description\" content=\"Here is all you need to know about the Cache-Control HTTP headers as used in HTML pages for websites and web applications\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/local.brightwhiz\/cache-control-http-headers-html-explained\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cache-Control HTTP Headers in HTML Pages Explained\" \/>\n<meta property=\"og:description\" content=\"Here is all you need to know about the Cache-Control HTTP headers as used in HTML pages for websites and web applications\" \/>\n<meta property=\"og:url\" content=\"http:\/\/local.brightwhiz\/cache-control-http-headers-html-explained\/\" \/>\n<meta property=\"og:site_name\" content=\"Brightwhiz.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/brightwhiz\/\" \/>\n<meta property=\"article:published_time\" content=\"2018-11-01T06:58:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-12-08T16:23:34+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/local.brightwhiz\/wp-content\/uploads\/2018\/10\/http-chache-control.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Michael Bright\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@brightwhizmag\" \/>\n<meta name=\"twitter:site\" content=\"@brightwhizmag\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michael Bright\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"http:\/\/local.brightwhiz\/cache-control-http-headers-html-explained\/#article\",\"isPartOf\":{\"@id\":\"http:\/\/local.brightwhiz\/cache-control-http-headers-html-explained\/\"},\"author\":{\"name\":\"Michael 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