{"id":5107,"date":"2011-04-21T19:40:44","date_gmt":"2011-04-21T18:40:44","guid":{"rendered":"http:\/\/www.ziserman.com\/blog\/?p=5107"},"modified":"2011-04-21T20:05:05","modified_gmt":"2011-04-21T19:05:05","slug":"le-drame-des-cookies","status":"publish","type":"post","link":"https:\/\/www.ziserman.com\/blog\/2011\/04\/21\/le-drame-des-cookies\/","title":{"rendered":"Le drame des cookies&#8230;"},"content":{"rendered":"<p>Les discussions actuelles, qui visent \u00e0 ajouter des fonctions de \u00ab\u00a0protection de la vie priv\u00e9e\u00a0\u00bb, \u00e7a peut avoir de tr\u00e8s fortes incidences sur nos m\u00e9tiers&#8230;<\/p>\n<p>Pour bien comprendre tout \u00e7a, \u00e7a vaut le coup de <strong>reprendre un peu l&rsquo;histoire du web<\/strong>.<\/p>\n<p>Au d\u00e9but, le web, c&rsquo;\u00e9tait simple :<\/p>\n<p>Il s&rsquo;agissait de pages de textes, statiques, contenant des liens permettant de naviguer, d&rsquo;une page \u00e0 l&rsquo;autre. Il y a eu rapidement des images, mais tout cela restait tr\u00e8s statique.<\/p>\n<p><a href=\"http:\/\/www.ziserman.com\/blog\/wp-content\/uploads\/2011\/04\/Capture-d\u2019\u00e9cran-2011-04-14-\u00e0-15.22.39.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-5108\" title=\"Premi\u00e8re page web de l'histoire\" src=\"http:\/\/www.ziserman.com\/blog\/wp-content\/uploads\/2011\/04\/Capture-d\u2019\u00e9cran-2011-04-14-\u00e0-15.22.39.png\" alt=\"\" width=\"461\" height=\"259\" \/><\/a><\/p>\n<p>Pour faire \u00e7a, Tim et ses \u00e9quipes ont travaill\u00e9s sur des choses tr\u00e8s simples : un langage de description de contenu, le HTML, et un protocole tr\u00e8s tr\u00e8s simple, le HTTP.<\/p>\n<p>Le protocole est hyper basique :<\/p>\n<ul>\n<li>Le serveur est passif, il \u00ab\u00a0dort\u00a0\u00bb tant qu&rsquo;il peut (le bienheureux \ud83d\ude09 )<\/li>\n<li>le client demande une page<\/li>\n<li>Le serveur re\u00e7oit la demande, et renvoie la page demand\u00e9e si elle existe, une erreur sinon (404, \u00e7a vous dit quelque chose ?)<\/li>\n<\/ul>\n<p>Point \u00e0 la ligne ! A la base, le protocol est \u00ab\u00a0stateless\u00a0\u00bb : <strong>le serveur ne fait pas le lien entre deux demandes<\/strong>. C&rsquo;est comme si il \u00e9tait amn\u00e9sique.<\/p>\n<p>Tout cela marche tr\u00e8s tr\u00e8s bien pour les premiers contenus du web.<\/p>\n<p>\u00e7a ne marche plus du tout quand il s&rsquo;agit de mettre de v\u00e9ritables applications transactionnelles en ligne.<\/p>\n<p>On a donc du \u00e9tendre le protocol initial, et ajouter un \u00ab\u00a0machin\u00a0\u00bb permettant de faire le lien entre deux pages.<\/p>\n<p>Pour nous, dans le e-commerce, c&rsquo;est juste fondamental : c&rsquo;est, par exemple, le moyen pour maintenir le panier du client rempli entre deux pages !<\/p>\n<p>Pour faire \u00e7a, la technique la plus utilis\u00e9e est d&rsquo;utiliser les cookies.<\/p>\n<p>Le m\u00e9canisme est assez simple :<\/p>\n<ul>\n<li>Le client demande une page (\u00e7a d\u00e9marre toujours comme \u00e7a \ud83d\ude09 )<\/li>\n<li>Le serveur renvoie la page, plus un petit texte, qu&rsquo;on appelle cookie, et qui sera interpr\u00e9t\u00e9 \u00e0 part par le navigateur du client, qui va stocker ce fichier sur le disque dur du client.<\/li>\n<li>Quand le client demande ensuite une page suivante, le navigateur renvoie le texte du petit fichier, vers le serveur.<\/li>\n<li>Le serveur re\u00e7oit donc deux choses : la page \u00e0 afficher plus le texte du cookie envoy\u00e9e la premi\u00e8re fois.<\/li>\n<\/ul>\n<p>Si, dans ce petit fichier, on stocke un identifiant unique, on a bien, c\u00f4t\u00e9 serveur, le moyen de faire le lien entre les deux pages. <strong>On a cr\u00e9\u00e9 une session<\/strong> !<\/p>\n<p>Petit d\u00e9tail compl\u00e9mentaire : le cookie est associ\u00e9 au nom de domaine du site. C&rsquo;est comme \u00e7a que vous pouvez trouver, sur votre navigateurs, les cookies associ\u00e9s \u00e0 chaque site web :<\/p>\n<p><a href=\"http:\/\/www.ziserman.com\/blog\/wp-content\/uploads\/2011\/04\/Capture-d\u2019\u00e9cran-2011-04-21-\u00e0-20.38.42.png\"><img decoding=\"async\" class=\"alignnone size-full wp-image-5141\" title=\"Exemple de cookies sur le domaine Amazon\" src=\"http:\/\/www.ziserman.com\/blog\/wp-content\/uploads\/2011\/04\/Capture-d\u2019\u00e9cran-2011-04-21-\u00e0-20.38.42.png\" alt=\"\" width=\"590\" height=\"253\" \/><\/a><\/p>\n<p>Bon, maintenant, les cookies, c&rsquo;est utilis\u00e9 pour pleins de choses. Si c&rsquo;est effectivement utilis\u00e9 dans une application e-commerce, ou tout autre application web, c&rsquo;est aussi utilis\u00e9 pour faire de la publicit\u00e9 cibl\u00e9e (je te fais de la publicit\u00e9 en rapport avec les pages sur lesquelles tu navigues).<\/p>\n<p>Je ne sais pas comment les choses vont \u00e9voluer, mais \u00e7a me semblait important de rappeler ces fondamentaux : pour travailler, on a besoin que ces m\u00e9canismes fonctionnent bien, et je crains que certains fassent l&rsquo;amalgame entre les cookies pour publicit\u00e9 et les cookies pour faire tourner les applications en ligne.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les discussions actuelles, qui visent \u00e0 ajouter des fonctions de \u00ab\u00a0protection de la vie priv\u00e9e\u00a0\u00bb, \u00e7a peut avoir de tr\u00e8s fortes incidences sur nos m\u00e9tiers&#8230; Pour bien comprendre tout \u00e7a, \u00e7a vaut le coup de reprendre un peu l&rsquo;histoire du web. Au d\u00e9but, le web, c&rsquo;\u00e9tait simple : Il s&rsquo;agissait de pages de textes, statiques, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[2],"tags":[379,371,84,230],"class_list":["post-5107","post","type-post","status-publish","format-standard","hentry","category-e-commerce","tag-araok","tag-e-commerce","tag-internet","tag-web"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le drame des cookies... - Ziserman.com<\/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:\/\/www.ziserman.com\/blog\/2011\/04\/21\/le-drame-des-cookies\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le drame des cookies... - Ziserman.com\" \/>\n<meta property=\"og:description\" content=\"Les discussions actuelles, qui visent \u00e0 ajouter des fonctions de \u00ab\u00a0protection de la vie priv\u00e9e\u00a0\u00bb, \u00e7a peut avoir de tr\u00e8s fortes incidences sur nos m\u00e9tiers&#8230; Pour bien comprendre tout \u00e7a, \u00e7a vaut le coup de reprendre un peu l&rsquo;histoire du web. 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