{"id":38322,"date":"2019-10-31T22:22:58","date_gmt":"2019-10-31T19:22:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/v-chrome-dobavlena-eksperimentalnaya-podderzhka-protokola-http-3\/"},"modified":"2019-10-31T22:22:58","modified_gmt":"2019-10-31T19:22:58","slug":"v-chrome-dobavlena-eksperimentalnaya-podderzhka-protokola-http-3","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/v-chrome-dobavlena-eksperimentalnaya-podderzhka-protokola-http-3","title":{"rendered":"Chrome a ajout\u00e9 un support exp\u00e9rimental pour le protocole HTTP\/3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Assemblages exp\u00e9rimentaux <noindex><a rel=\"nofollow\" href=\"https:\/\/www.google.com\/chrome\/canary\/\">Chrome Canary<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/programmingart\/status\/1174775953316294658\">ajout\u00e9<\/a><\/noindex> prise en charge du protocole HTTP\/3, qui impl\u00e9mente une couche pour ex\u00e9cuter HTTP sur le protocole QUIC. Le protocole QUIC a \u00e9t\u00e9 ajout\u00e9 au navigateur il y a cinq ans et est depuis utilis\u00e9 pour optimiser les services de Google. Cependant, la variante de QUIC utilis\u00e9e dans Chrome diff\u00e9rait sur certains points de celle de <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">sp\u00e9cifications<\/a><\/noindex> l'IETF, mais les impl\u00e9mentations sont d\u00e9sormais synchronis\u00e9es.<\/p>\n<p>HTTP\/3 standardise l'utilisation de QUIC comme transport pour HTTP\/2. Pour activer HTTP\/3 et la variante QUIC de <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">la version 23 de l'\u00e9bauche<\/a><\/noindex> Les sp\u00e9cifications de l'IETF n\u00e9cessitent de lancer Chrome avec les options &#171;&#8212;enable-quic &#8212;quic-version=h3-23&#187;, apr\u00e8s quoi l'ouverture d'un site web de test <noindex><a rel=\"nofollow\" href=\"https:\/\/quic.rocks:4433\/\">quic.rocks:4433<\/a><\/noindex> en mode d'inspection r\u00e9seau dans les outils de d\u00e9veloppement affichera l'activit\u00e9 HTTP\/3 comme &#171;http\/2+quic\/99&#187;.<\/p>\n<p>Rappelons que le protocole <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/quic\/\">QUIC<\/a><\/noindex> (Quick UDP Internet Connections) est d\u00e9velopp\u00e9 depuis 2013 par Google comme une alternative \u00e0 la combinaison TCP+TLS pour le Web, r\u00e9solvant les probl\u00e8mes li\u00e9s aux temps de connexion \u00e9lev\u00e9s et \u00e0 la n\u00e9gociation dans TCP, et \u00e9liminant les retards lors de la perte de paquets pendant la transmission des donn\u00e9es. QUIC est une surcouche sur le protocole UDP, prenant en charge le multiplexage de plusieurs connexions et fournissant des m\u00e9thodes de chiffrement \u00e9quivalentes \u00e0 TLS\/SSL. Ce protocole est d\u00e9j\u00e0 int\u00e9gr\u00e9 dans l'infrastructure serveur de Google, fait partie de Chrome, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48312\">est pr\u00e9vu<\/a><\/noindex> pour \u00eatre activ\u00e9 dans Firefox et est largement utilis\u00e9 pour traiter les demandes des clients sur les serveurs de Google. <\/p>\n<p>Principales <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.google.com\/document\/d\/1lmL9EF6qKrk7gbazY8bIdvq3Pno2Xj_l_YShP40GLQE\/preview?sle=true#\">caract\u00e9ristiques<\/a><\/noindex> QUIC :\n<\/p>\n<ul>\n<li class=\"l\"> Haute s\u00e9curit\u00e9, similaire \u00e0 TLS (en substance, QUIC permet d'utiliser TLS sur UDP) ;\n<\/li>\n<li class=\"l\"> Contr\u00f4le de l'int\u00e9grit\u00e9 du flux, emp\u00eachant la perte de paquets ;\n<\/li>\n<li class=\"l\"> Possibilit\u00e9 d'\u00e9tablir une connexion instantan\u00e9ment (0-RTT, dans environ 75% des cas les donn\u00e9es peuvent \u00eatre transmises imm\u00e9diatement apr\u00e8s l'envoi du paquet d'\u00e9tablissement de connexion) et de garantir des d\u00e9lais minimaux entre l'envoi de la demande et la r\u00e9ception de la r\u00e9ponse (RTT, Round Trip Time) ;\n<\/li>\n<li class=\"l\"> Non-utilisation lors de la retransmission d'un paquet du m\u00eame num\u00e9ro de s\u00e9quence, permettant d'\u00e9viter toute ambigu\u00eft\u00e9 lors de la d\u00e9termination des paquets re\u00e7us et d'\u00e9liminer les d\u00e9lais d'attente ;\n<\/li>\n<li class=\"l\"> La perte d'un paquet n'affecte que la livraison du flux qui lui est associ\u00e9 et ne bloque pas la livraison des donn\u00e9es dans les flux simultan\u00e9ment transmis via la connexion actuelle ;\n<\/li>\n<li class=\"l\"> Les m\u00e9canismes de correction d'erreurs r\u00e9duisent les d\u00e9lais dus \u00e0 la retransmission des paquets perdus. L'utilisation de codes sp\u00e9cifiques de correction d'erreurs au niveau du paquet permet de r\u00e9duire les situations n\u00e9cessitant la retransmission des donn\u00e9es d'un paquet perdu.\n<\/li>\n<li class=\"l\"> Les fronti\u00e8res cryptographiques des blocs sont align\u00e9es sur les fronti\u00e8res des paquets QUIC, ce qui r\u00e9duit l'impact des pertes de paquets sur le d\u00e9codage du contenu des paquets suivants.\n<\/li>\n<li class=\"l\"> Absence de probl\u00e8mes de blocage de la queue TCP.\n<\/li>\n<li class=\"l\"> Support de l'identifiant de connexion, permettant de r\u00e9duire le temps d'\u00e9tablissement d'une reconnexion pour les clients mobiles.\n<\/li>\n<li class=\"l\"> Capacit\u00e9 \u00e0 se connecter \u00e0 des m\u00e9canismes avanc\u00e9s de contr\u00f4le de congestion.\n<\/li>\n<li class=\"l\"> Utilisation de techniques de pr\u00e9vision de bande passante dans chaque direction pour garantir une intensit\u00e9 d'envoi optimale des paquets, emp\u00eachant un glissement vers un \u00e9tat de congestion, o\u00f9 des pertes de paquets sont observ\u00e9es.\n<\/li>\n<li class=\"l\">  Une augmentation <noindex><a rel=\"nofollow\" href=\"http:\/\/web.cs.wpi.edu\/~claypool\/ms\/quic\/quic-thesis.pdf\">remarquable<\/a><\/noindex> de performance et de bande passante par rapport \u00e0 TCP. Pour les services vid\u00e9o tels que YouTube, l'application de QUIC a montr\u00e9 une r\u00e9duction de 30% des op\u00e9rations de re-buffering lors du visionnage de vid\u00e9os.\n<\/li>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Source : <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51526\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0435 \u0441\u0431\u043e\u0440\u043a\u0438 Chrome Canary \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 HTTP\/3, \u0440\u0435\u0430\u043b\u0438\u0437\u0443\u044e\u0449\u0435\u0433\u043e \u043d\u0430\u0434\u0441\u0442\u0440\u043e\u0439\u043a\u0443 \u0434\u043b\u044f \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b HTTP \u043f\u043e\u0432\u0435\u0440\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 QUIC. \u041d\u0435\u043f\u043e\u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b QUIC \u0431\u044b\u043b \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d \u0432 \u0431\u0440\u0430\u0443\u0437\u0435\u0440 \u043f\u044f\u0442\u044c \u043b\u0435\u0442 \u043d\u0430\u0437\u0430\u0434 \u0438 \u0441 \u0442\u0435\u0445 \u043f\u043e\u0440 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0441\u0435\u0440\u0432\u0438\u0441\u0430\u043c\u0438 Google. \u041f\u0440\u0438 \u044d\u0442\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0432\u0448\u0438\u0439\u0441\u044f \u0432 Chrome \u0432\u0430\u0440\u0438\u0430\u043d\u0442 QUIC \u043e\u0442 Google \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0434\u0435\u0442\u0430\u043b\u044f\u0445 \u043e\u0442\u043b\u0438\u0447\u0430\u043b\u0441\u044f \u043e\u0442 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0430 \u0438\u0437 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-38322","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0435 \u0441\u0431\u043e\u0440\u043a\u0438 Chrome Canary\" \/>\n\t<meta name=\"robots\" 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