{"id":17663,"date":"2014-03-11T09:53:45","date_gmt":"2014-03-11T08:53:45","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=17663"},"modified":"2023-02-27T14:37:20","modified_gmt":"2023-02-27T14:37:20","slug":"rel-canonical-cose-e-come-si-usa","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/marketing\/rel-canonical-cose-e-come-si-usa\/","title":{"rendered":"rel=&#8221;Canonical&#8221;: ecco cos\u2019\u00e8 e come si usa"},"content":{"rendered":"<p>Il <strong>rel=canonical<\/strong> \u00e8 spesso motivo di confusione e di errori. Nonostante il concetto possa essere di facile comprensione, l&#8217;implementazione risulta pi\u00f9 complessa di quanto si pensi. Se utilizzato correttamente, questo strumento eviter\u00e0 l\u2019indicizzazione multipla sui motori di ricerca di pagine accessibili da url differenti, riconducendo i vari spider verso <strong>una pagina definita \u201ccanonica\u201d<\/strong>. In questo breve post si cercher\u00e0 di fare chiarezza su cosa sia effettivamente il rel=canonical e come utilizzarlo nel miglior modo possibile.<\/p>\n<h2>Che cos&#8217;\u00e8 e che cosa non \u00e8<\/h2>\n<p>Tra i tanti problemi nel campo dell\u2019ottimizzazione dei siti internet c&#8217;\u00e8 la possibilit\u00e0 che i visitatori accedano ad una stessa pagina tramite percorsi diversi e questo genera URL differenti per un medesimo contenuto.<\/p>\n<p>Si pensi ad esempio alla struttura di un sito ecommerce organizzato in categorie e sottocategorie (esempio &#8220;<em>categoria\/sottocategoria\/prodotto.html<\/em>&#8220;). Se un prodotto di una sottocategoria risultasse in promozione si potrebbe avere un altro url che punta a quel prodotto (esempio &#8220;<em>promo\/prodotto.html<\/em>&#8220;). In questo caso, se non si usasse il canonical, si avrebbe una pagina indicizzata nei motori di ricerca con <strong>due url diversi<\/strong>.<\/p>\n<p>L&#8217;utilizzo delle <strong>pagine canoniche<\/strong> rientra, quindi, tra gli strumenti SEO per evitare l\u2019indicizzazione di URL diversi che fanno riferimento agli stessi contenuti.<\/p>\n<p>Occorre fare attenzione a non confondere le pagine canoniche con altri concetti che si potrebbero ritenere &#8220;simili&#8221;. La pagina canonica non \u00e8:<\/p>\n<ul>\n<li>un redirect 301<\/li>\n<li>la home page del sito<\/li>\n<li>la \u201cREQUEST_URI\u201d<\/li>\n<\/ul>\n<h2>Come e quando utilizzarlo<\/h2>\n<p>\u00c8 possibile implementare una pagina canonica inserendo il <strong>tag &#8220;link&#8221; contenente la propriet\u00e0 rel=&#8221;canonical&#8221;<\/strong> ed ahref con l&#8217;indirizzo della pagina canonica. L&#8217;elemento link deve essere contenuto nei tag &#8220;head&#8221; della pagina. Lo stesso canonical con le medesime propriet\u00e0, dovr\u00e0 poi essere riportato su tutte le pagine che hanno gli stessi contenuti.<\/p>\n<p>Una cosa utile, ma poco conosciuta, del rel=&#8221;canonical&#8221; \u00e8 che il suo impiego non \u00e8 limitato solo alle pagine html. \u00c8 possibile, infatti, utilizzarlo anche per le risorse inserendolo negli HTTP headers. Un esempio potrebbe essere la presenza di <strong>formati diversi per uno stesso documento<\/strong> (.doc, .pdf, .txt ecc).<\/p>\n<p>\u00c8 possibile utilizzare le pagine canoniche anche per contenuti che risiedano su domini differenti. In questo caso, baster\u00e0 indicare nella propriet\u00e0 href del tag link l&#8217;indirizzo assoluto della pagina:<\/p>\n<p>[code type=&#8221;markup&#8221;]<link href=\"http:\/\/www.nomesito.it\/paginacanonica.html\" rel=\"canonical\" \/>[\/code]<\/p>\n<h2>Link rel=&#8221;prev&#8221; e link rel=&#8221;next&#8221;<\/h2>\n<p>Fanno parte della &#8220;famiglia&#8221; del canonical anche i tag &#8220;link&#8221; con propriet\u00e0 <strong>rel=&#8221;next&#8221; e rel=&#8221;prev&#8221;<\/strong>. Questi due elementi, se inseriti e strutturati correttamente, dovrebbero indicare agli spider dei browser la paginazione corretta di un sito. Facendo un esempio, si potrebbe avere l&#8217;url di una categoria che contenga prodotti, divisi su pi\u00f9 pagine &#8220;<em>dominio.com\/categoria<\/em>&#8220;: le pagine successive avranno quindi url del tipo &#8220;<em>dominio.com\/categoria?page=2<\/em>&#8220;, &#8220;<em>dominio.com\/categoria?page=3<\/em>&#8220;, ecc. Verrebbe naturale pensare di inserire un canonical che ha come url la pagina iniziale della categoria &#8220;<em>dominio.com\/categoria<\/em>&#8220;.<\/p>\n<p>Da settembre 2011, per\u00f2, Google ha riconosciuto ufficialmente l&#8217;utilizzo di rel=&#8221;next&#8221; e rel=&#8221;prev&#8221; per ordinare e per mettere in relazione contenuti &#8220;spalmati&#8221; su pi\u00f9 pagine.<\/p>\n<p>Per la prima pagina di categoria non ci sar\u00e0 il rel=&#8221;prev&#8221;, ma si avr\u00e0:<br \/>\n[code type=&#8221;markup&#8221;]<link href=\"http:\/\/dominio.com\/categoria?page=2\" rel=\"next\" \/>[\/code] <\/p>\n<p>Per la seconda pagina di categoria, invece:<br \/>\n[code type=&#8221;markup&#8221;]<link href=\"\u201dhttp:\/\/dominio.com\/categoria?page=3\u201d\" rel=\"\u201dnext\u201d\" \/>[\/code]<br \/>\n[code type=&#8221;markup&#8221;]<link href=\"\u201dhttp:\/\/dominio.com\/categoria?page=1\" rel=\"\u201dprev\u201d\" \/>[\/code]<\/p>\n<p>Secondo Google, se si utilizzassero questi tag, si fornirebbe allo spider del motore di ricerca una solida struttura che permetterebbe l&#8217;indicizzazione dei contenuti con maggior correttezza creando anche relazioni per <strong>contenuti disposti su pi\u00f9 pagine<\/strong>. Il nostro consiglio \u00e8 quello di inserire, comunque, una pagina canonica, preferibilmente una &#8220;View All&#8221; page.<\/p>\n<p>Concludendo ci preme informare che Google si riserva di interpretare l&#8217;utilizzo delle pagine canoniche valutando caso per caso tentando di ovviare ad eventuali errori di implementazione. La cosa migliore da fare sarebbe, per\u00f2, quella di utilizzare in modo preciso il canonical evitando di lasciare libera interpretazione ai browser.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Il <strong>rel=canonical<\/strong> \u00e8 spesso motivo di confusione e di errori. L&#8217;implementazione risulta pi\u00f9 complessa di quanto si pensi, ma se utilizzato correttamente questo strumento eviter\u00e0 l\u2019indicizzazione multipla sui motori di ricerca di pagine accessibili da url differenti.<\/p>\n","protected":false},"author":4,"featured_media":17692,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[300],"tags":[362,290,117],"class_list":["post-17663","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-marketing","tag-indicizzazione","tag-programmazione","tag-seo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u2022 rel=&quot;Canonical&quot;: ecco cos\u2019\u00e8 e come si usa - Artera<\/title>\n<meta name=\"description\" content=\"Il rel=canonical, se utilizzato correttamente, eviter\u00e0 l\u2019indicizzazione sui motori di ricerca di pagine accessibili da url differenti.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.artera.net\/it\/marketing\/rel-canonical-cose-e-come-si-usa\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u2022 rel=&quot;Canonical&quot;: ecco cos\u2019\u00e8 e come si usa - 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