{"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\/ro\/blog\/news\/v-chrome-dobavlena-eksperimentalnaya-podderzhka-protokola-http-3","title":{"rendered":"Chrome a ad\u0103ugat suport experimental pentru protocolul HTTP\/3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00cen versiunile experimentale <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\">a fost ad\u0103ugat\u0103<\/a><\/noindex> suport pentru protocolul HTTP\/3, care realizeaz\u0103 un overlay pentru a permite func\u021bionarea HTTP peste protocolul QUIC. Protocolul QUIC a fost inclus \u00een browser \u00een urm\u0103 cu cinci ani \u0219i de atunci este folosit pentru optimizarea interac\u021biunii cu serviciile Google. Varianta QUIC utilizat\u0103 \u00een Chrome a diferit \u00een detalii de cea din <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">specifica\u021biilor<\/a><\/noindex> IETF, dar acum implement\u0103rile sunt sincronizate.<\/p>\n<p>HTTP\/3 standardizeaz\u0103 utilizarea QUIC ca transport pentru HTTP\/2. Pentru a activa HTTP\/3 \u0219i varianta QUIC din <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">draftul 23<\/a><\/noindex> Specifica\u021biile IETF necesit\u0103 lansarea Chrome cu op\u021biunile  &#171;&#8212;enable-quic &#8212;quic-version=h3-23&#187;, dup\u0103 care, c\u00e2nd deschide\u021bi site-ul de testare <noindex><a rel=\"nofollow\" href=\"https:\/\/quic.rocks:4433\/\">quic.rocks:4433<\/a><\/noindex> \u00een modul de inspectare a re\u021belei \u00een instrumentele pentru dezvoltatori, activitatea pe HTTP\/3 va fi afi\u0219at\u0103 ca &#171;http\/2+quic\/99&#187;.<\/p>\n<p>Aminte\u0219te c\u0103 protocolul <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/quic\/\">QUIC<\/a><\/noindex> (Quick UDP Internet Connections) este dezvoltat de Google din 2013 ca o alternativ\u0103 la combina\u021bia TCP+TLS pentru web, rezolv\u00e2nd problemele cu timpul mare de configurare \u0219i negociere a conec\u021biunilor \u00een TCP \u0219i elimin\u00e2nd \u00eent\u00e2rzierile cauzate de pierderea pachetelor \u00een timpul transferului de date. QUIC este o extensie a protocolului UDP, care suport\u0103 multiplexarea mai multor conexiuni \u0219i ofer\u0103 metode de criptare echivalente cu TLS\/SSL. Protocolul discutat este deja integrat \u00een infrastructura serverelor Google, face parte din Chrome, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48312\">este planificat\u0103<\/a><\/noindex> pentru a fi activat \u00een Firefox \u0219i utilizat activ pentru a r\u0103spunde cererilor clien\u021bilor pe serverele Google. <\/p>\n<p>Principalele <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.google.com\/document\/d\/1lmL9EF6qKrk7gbazY8bIdvq3Pno2Xj_l_YShP40GLQE\/preview?sle=true#\">grafica realizat\u0103 prin WebGL \u0219i<\/a><\/noindex> QUIC:\n<\/p>\n<ul>\n<li class=\"l\"> Securitate \u00eenalt\u0103, similar\u0103 cu TLS (\u00een esen\u021b\u0103, QUIC ofer\u0103 posibilitatea utiliz\u0103rii TLS peste UDP);\n<\/li>\n<li class=\"l\"> Controlul integrit\u0103\u021bii fluxului, prevenind pierderea pachetelor;\n<\/li>\n<li class=\"l\"> Posibilitatea de a stabili instantaneu o conexiune (0-RTT, \u00een aproximativ 75% din cazuri, datele pot fi transmise imediat dup\u0103 trimiterea pachetului de stabilire a conexiunii) \u0219i de a asigura \u00eent\u00e2rzieri minime \u00eentre trimiterea cererii \u0219i primirea r\u0103spunsului (RTT, Round Trip Time);\n<\/li>\n<li class=\"l\"> Neutilizarea la retransmiterea pachetului cu acela\u0219i num\u0103r de secven\u021b\u0103, ceea ce permite evitarea ambiguit\u0103\u021bilor \u00een determinarea pachetelor primite \u0219i eliminarea timeout-urilor;\n<\/li>\n<li class=\"l\"> Pierderea unui pachet afecteaz\u0103 livrarea doar a fluxului asociat \u0219i nu opre\u0219te livrarea datelor \u00een fluxurile transmise \u00een paralel prin conexiunea curent\u0103;\n<\/li>\n<li class=\"l\"> Mijloace de corectare a erorilor, care minimizeaz\u0103 \u00eent\u00e2rzierile cauzate de retransmisia pachetelor pierdute. Utilizarea unor coduri speciale de corectare a erorilor la nivel de pachet pentru a reduce situa\u021biile care necesit\u0103 retransmiterea datelor din pachetul pierdut.\n<\/li>\n<li class=\"l\"> Grani\u021bele criptografice ale blocurilor sunt aliniate cu grani\u021bele pachetelor QUIC, ceea ce reduce impactul pierderilor de pachete asupra decod\u0103rii con\u021binutului pachetelor urm\u0103toare;\n<\/li>\n<li class=\"l\"> Lipsa problemelor cu blocarea cozii TCP;\n<\/li>\n<li class=\"l\"> Suport pentru identificatorul de conexiune, care permite reducerea timpului de reinstaurare a conexiunii pentru clien\u021bi mobile;\n<\/li>\n<li class=\"l\"> Posibilitatea de a activa mecanisme extinse de control al supra\u00eenc\u0103rc\u0103rii conexiunii;\n<\/li>\n<li class=\"l\"> Utilizarea tehnicii de previzionare a capacit\u0103\u021bii de transmisie \u00een fiecare direc\u021bie pentru a asigura o intensitate optim\u0103 a trimiterii pachetelor, prevenind astfel ajungerea \u00eentr-o stare de supra\u00eenc\u0103rcare, \u00een care se observ\u0103 pierderi de pachete;\n<\/li>\n<li class=\"l\">  Un salt semnificativ <noindex><a rel=\"nofollow\" href=\"http:\/\/web.cs.wpi.edu\/~claypool\/ms\/quic\/quic-thesis.pdf\">\u00een performan\u021b\u0103<\/a><\/noindex> \u0219i l\u0103\u021bime de band\u0103, comparativ cu TCP. Pentru serviciile video, cum ar fi YouTube, utilizarea QUIC a ar\u0103tat o reducere a opera\u021biunilor de rebuffering \u00een timpul vizion\u0103rii video cu 30%.\n<\/li>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Sursa: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51526\">opennet.ro<\/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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