{"id":51,"date":"2005-01-18T17:02:38","date_gmt":"2005-01-18T15:02:38","guid":{"rendered":"http:\/\/www.desmm.com\/?p=51"},"modified":"2005-01-18T17:02:38","modified_gmt":"2005-01-18T15:02:38","slug":"cose-uno-spider","status":"publish","type":"post","link":"https:\/\/www.desmm.com\/blog\/cose-uno-spider-51.html","title":{"rendered":"Cos&#8217;\u00e8 uno Spider?"},"content":{"rendered":"<p>Uno Spider (o robot) \u00e8 un sistema automatico di navigazione internet che i motori di ricerca utilizzano per scandagliare la rete alla ricerca di pagine nuove o aggiornate&#8230;<\/p>\n<div class=\"splash\"><img src='http:\/\/www.desmm.com\/wp-content\/uploads\/spiderweb.jpg' alt='spider web' \/><\/div>\n<p><!--more-->La frequenza o l&#8217;accettazione di visite degli Spider in un sito, \u00e8 gestibile dai metatag di pagina. Prendete come esempio il seguente codice:<br \/>\n<code lang=\"html\"><meta name=\"revisit-after\" content=\"3 days\"><\/meta><\/code><br \/>\nChe \u00e8 praticamente l&#8217;invito agli spider di tornate ogni 3 giorni.<\/p>\n<p>Le prime visite, degli Spider, saranno saltuarie e poco regolari e non registreranno oltre che l&#8217;Index del sito.<br \/>\nInseguito gli Spider, dopo aver verificato che il sito continua ad esestere, si muoveranno sempre pi\u00f9 nell&#8217;interno &#8220;dell&#8217;albero&#8221; del sito.<br \/>\nUn codice html pulito facilita il passagio di questi benvenuti(quasi sempre) ospiti. Per codice pulito intendo dire che, il link riferiti alle pagine interne del sito, \u00e8 bene che siano semplici url e non Javascript, Applet, Flash link, altrimenti lo spider non potr\u00e0 valicare l&#8217;ostacolo e la pagina non sar\u00e0 mai indicizzata e di conseguenza, mai trovata via motore di ricerca.<br \/>\nA volete accade di trovarsi davanti a siti con Pagerank 3\/4 nella pre homepage (o intropage), ma con Pagerank zero nelle sue interne. Questo \u00e8 un tipico caso duvuto dal fatto che lo spider non riesce a risalire sulla homepage per colpa di un link non &#8220;pulito&#8221; (come ho spiegato sopra).<br \/>\nPer lo stesso motivo i siti in Flash hanno poco potere sui motori di ricerca. Comunque \u00e8 gi\u00e0 stato comunicato che in futuro anche gli .SWF saranno indicizzati.<\/p>\n<p>Per questioni di scelta si pu\u00f2 anche proibire l&#8217;indicizzazione di pagine o consentirne il solo passaggio come in questo esempio di codice:<br \/>\n<code lang=\"html\"><meta name=\"robots\" content=\"noindex,follow\"><\/meta><\/code><br \/>\nEcco altri CONTENT che possono essere utilizzati:<\/p>\n<p>all indica che tutte le pagine possono essere indicizzati<\/p>\n<ul>\n<li><strong>none<\/strong> indica che nessun file va indicizzato e che non vanno attuati i collegamenti inseriti nella pagina<\/li>\n<li><strong>index<\/strong> indica che la pagina pu\u00f2 essere indicizzata<\/li>\n<li><strong>noindex<\/strong> indica che la pagina non pu\u00f2 essere indicizzata<\/li>\n<li><strong>follow<\/strong> indica che lo spider pu\u00f2 seguire i collegamenti dalla pagina in oggetto ad altre pagine<\/li>\n<li><strong>nofollow<\/strong>indica che lo spider non pu\u00f2 seguire i collegamenti dalla pagina in oggetto ad altre pagine<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Uno Spider (o robot) \u00e8 un sistema automatico di navigazione internet che i motori di ricerca utilizzano per scandagliare la rete alla ricerca di pagine nuove o aggiornate&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-51","post","type-post","status-publish","format-standard","hentry","category-archivio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cos&#039;\u00e8 uno Spider? 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