{"id":18075,"date":"2018-05-07T15:09:31","date_gmt":"2018-05-07T15:09:31","guid":{"rendered":"http:\/\/kinstastaging.com\/it\/?post_type=knowledgebase&#038;p=18075"},"modified":"2025-10-01T20:54:44","modified_gmt":"2025-10-01T19:54:44","slug":"specify-vary-accept-encoding-header","status":"publish","type":"post","link":"https:\/\/kinqsta.com\/it\/blog\/specify-vary-accept-encoding-header\/","title":{"rendered":"Come Eliminare l&#8217;Avviso &#8220;Specify a Vary: Accept-Encoding Header&#8221;"},"content":{"rendered":"<p>State visualizzando l&#8217;avviso &#8220;Specify a Vary: Accept-Encoding Header&#8221; in <a href=\"https:\/\/kinqsta.com\/it\/blog\/test-velocita-pingdom\/\" target=\"_blank\" rel=\"noopener noreferrer\">Pingdom<\/a>, <a href=\"https:\/\/kinqsta.com\/it\/blog\/speed-test-gtmetrix\/\" target=\"_blank\" rel=\"noopener noreferrer\">GTmetrix<\/a> o <a href=\"https:\/\/kinqsta.com\/it\/blog\/google-pagespeed-insights\/\" target=\"_blank\" rel=\"noopener noreferrer\">Google PageSpeed Insights<\/a> per il tuo sito WordPress? Si tratta di un&#8217;intestazione HTTP e <span style=\"text-decoration: underline\">dovrebbe essere inclusa in ogni risposta del server di origine<\/span>, in quanto indica al browser se il client pu\u00f2 gestire o meno le versioni compresse del contenuto.<\/p>\n<p>Ad esempio, supponiamo di avere un vecchio browser senza compressione gzip e, insieme a questo, un browser moderno. Se non si utilizza l&#8217;header <strong>Vary: Accept-Encoding<\/strong>, il server web o il <a href=\"https:\/\/kinqsta.com\/it\/blog\/cdn-per-wordpress\/\" target=\"_blank\" rel=\"noopener noreferrer\">CDN<\/a> potrebbe memorizzare nella cache la versione non compressa e consegnarla per errore al browser moderno, il che a sua volta danneggerebbe le prestazioni del proprio sito WordPress. Utilizzando l&#8217;intestazione <strong>Vary: Accept-Encoding<\/strong> \u00e8 possibile garantire che il proprio server Web o CDN fornisca la versione appropriata.<\/p>\n<p>A seconda dello strumento o del software che lo segnala, l&#8217;avviso potrebbe apparire in due modi diversi:<\/p>\n<ul>\n<li>&#8220;Specify a Vary: Accept-Encoding Header&#8221;<\/li>\n<li>The following publicly cacheable, compressible resources should have a \u201cvary: accept-encoding\u201d header<\/li>\n<\/ul>\n<figure id=\"attachment_19768\" aria-describedby=\"caption-attachment-19768\" style=\"width: 1688px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-19768\" src=\"https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/specify-vary-accept-encoding-header.png\" alt=\"Specify a Vary: Accept-Encoding header\" width=\"1688\" height=\"1205\" srcset=\"https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/specify-vary-accept-encoding-header.png 1688w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/specify-vary-accept-encoding-header-300x214.png 300w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/specify-vary-accept-encoding-header-768x548.png 768w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/specify-vary-accept-encoding-header-1024x731.png 1024w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/specify-vary-accept-encoding-header-610x435.png 610w\" sizes=\"auto, (max-width: 1688px) 100vw, 1688px\" \/><figcaption id=\"caption-attachment-19768\" class=\"wp-caption-text\">L&#8217;avviso Specify a Vary: Accept-Encoding header in Pingdom<\/figcaption><\/figure>\n<p>Seguite i passaggi sottostanti per eliminare l&#8217;avviso &#8220;Specify a Vary: Accept-Encoding Header&#8221;.<\/p>\n<h2>Eliminare l&#8217;avviso &#8220;Specify a Vary: Accept-Encoding Header&#8221;<\/h2>\n<p>La prima cosa che \u00e8 importante notare per quanto riguarda questo avviso \u00e8 che <span style=\"text-decoration: underline\">\u00e8 possibile risolvere il problema solo per le richieste che si trovano sul proprio server<\/span>. Se state vedendo questo avviso su richieste di terze parti, non c&#8217;\u00e8 nulla che potete fare perch\u00e9 non avete il controllo sui loro server web. Ma sentitevi liberi di condividere con loro questo articolo. L&#8217;header <strong>Vary: Accept-Encoding<\/strong> viene aggiunto di default su tutti i server di Kinsta (come si vede qui sotto), quindi, se siete clienti Kinsta, non vedrete mai questo avviso e non dovrete preoccuparvi.<\/p>\n<figure id=\"attachment_19769\" aria-describedby=\"caption-attachment-19769\" style=\"width: 1567px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-19769\" src=\"https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/vary-accept-encoding-header-kinsta.png\" alt=\"Vary: Accept-Encoding header\" width=\"1567\" height=\"622\" srcset=\"https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/vary-accept-encoding-header-kinsta.png 1567w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/vary-accept-encoding-header-kinsta-300x119.png 300w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/vary-accept-encoding-header-kinsta-768x305.png 768w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/vary-accept-encoding-header-kinsta-1024x406.png 1024w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/vary-accept-encoding-header-kinsta-610x242.png 610w\" sizes=\"auto, (max-width: 1567px) 100vw, 1567px\" \/><figcaption id=\"caption-attachment-19769\" class=\"wp-caption-text\">Vary: Accept-Encoding header sui server di Kinsta<\/figcaption><\/figure>\n<p>L&#8217;header si applica sia alle risorse di WordPress che alla richiesta originale del server. Per quanto riguarda le vostre risorse, se state utilizzando un CDN, sappiate che molti gi\u00e0 applicano di default l&#8217;avviso <strong>Vary: Accept-Encoding<\/strong>. KeyCDN, Cloudflare e CloudFront lo utilizzano tutti. o aggiungono anche molti plugin di caching.<\/p>\n<p>Se avete ancora bisogno di risolvere questo problema, dovrete aggiungere del codice al vostro server.<\/p>\n<h3>Eliminare l&#8217;Avviso &#8220;Specify a Vary: Accept-Encoding Header&#8221; in Apache<\/h3>\n<p>Per risolvere il problema in Apache, aggiungete il seguente codice al vostro file .htaccess via FTP. Questo file si trova nella root del vostro server. Potete anche <a href=\"https:\/\/kb.yoast.com\/kb\/how-to-edit-htaccess-through-yoast-seo\/\" target=\"_blank\" rel=\"noopener noreferrer\">modificare il vostro file .htaccess<\/a> con il <a href=\"https:\/\/kinqsta.com\/it\/blog\/yoast-seo\/\" target=\"_blank\" rel=\"noopener noreferrer\">plugin Yoast SEO<\/a>, se le vostre autorizzazioni sono impostate correttamente.<\/p>\n<div class=\"warning\" style=\"background: #FFFCE3;padding: 22px;margin-bottom: 22px\">Importante! La modifica del file .htaccess potrebbe interrompere il sito se non eseguito correttamente. Se non ti sentite sicuri nel fare queste modifiche, \u00e8 meglio verificare prima con il vostro host web.<\/div>\n<pre><code>&lt;IfModule mod_headers.c&gt;\n  &lt;FilesMatch \".(js|css|xml|gz|html)$\"&gt;\n    Header append Vary: Accept-Encoding\n  &lt;\/FilesMatch&gt;\n&lt;\/IfModule&gt;<\/code><\/pre>\n<h3>Eliminare l&#8217;Avviso &#8220;Specify a Vary: Accept-Encoding Header&#8221; in NGINX<\/h3>\n<p>Per risolvere il problema in NGINX, aggiungete il seguente codice al vostro file di configurazione. Tutti i file di configurazione NGINX si trovano nella directory <code>\/etc\/nginx\/<\/code>. Il file di configurazione principale \u00e8 <code>\/etc\/nginx\/nginx.conf<\/code>.<\/p>\n<pre><code>gzip_vary on<\/code><\/pre>\n<p>L&#8217;utilizzo dell&#8217;header <strong>Vary: Accept-Encoding<\/strong> pu\u00f2 infatti aiutare a velocizzare il vostro sito WordPress, in quanto garantisce l&#8217;utilizzo della compressione gzip. E se tutto va bene e non avetei richieste di terze parti che non utilizzano correttamente l&#8217;header, dovreste vedere un miglioramento del vostro punteggio con strumenti di test della velocit\u00e0 dei siti web come Pingdom (come si pu\u00f2 vedere qui sotto).<\/p>\n<figure id=\"attachment_19767\" aria-describedby=\"caption-attachment-19767\" style=\"width: 1691px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-19767\" src=\"https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/100-score-accept-encoding-header.png\" alt=\"Punteggio 100 Specify a Vary: Accept-Encoding header\" width=\"1691\" height=\"683\" srcset=\"https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/100-score-accept-encoding-header.png 1691w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/100-score-accept-encoding-header-300x121.png 300w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/100-score-accept-encoding-header-768x310.png 768w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/100-score-accept-encoding-header-1024x414.png 1024w, https:\/\/kinqsta.com\/it\/wp-content\/uploads\/sites\/2\/2018\/05\/100-score-accept-encoding-header-610x246.png 610w\" sizes=\"auto, (max-width: 1691px) 100vw, 1691px\" \/><figcaption id=\"caption-attachment-19767\" class=\"wp-caption-text\">L&#8217;avviso Specify a Vary: Accept-Encoding header<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>State visualizzando l&#8217;avviso &#8220;Specify a Vary: Accept-Encoding Header&#8221; in Pingdom, GTmetrix o Google PageSpeed Insights per il tuo sito WordPress? Si tratta di un&#8217;intestazione HTTP e &#8230;<\/p>\n","protected":false},"author":38,"featured_media":55837,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[25941],"class_list":["post-18075","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-problemi-di-wordpress"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Come Eliminare l&#039;Avviso &quot;Specify a Vary: Accept-Encoding Header&quot;<\/title>\n<meta name=\"description\" content=\"Scopriamo come eliminare dal vostro sito WordPress l&#039;avviso &quot;Specify a Vary: Accept-Encoding Header&quot; che vedete in Pingdom, GTmetrix e PageSpeed Insights.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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