{"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\/pt\/blog\/news\/v-chrome-dobavlena-eksperimentalnaya-podderzhka-protokola-http-3","title":{"rendered":"O Chrome adicionou suporte experimental para o protocolo HTTP\/3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Em compila\u00e7\u00f5es experimentais <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\">foi adicionada<\/a><\/noindex> suporte ao protocolo HTTP\/3, que implementa uma camada para operar HTTP sobre o protocolo QUIC. O protocolo QUIC foi adicionado ao navegador h\u00e1 cinco anos e desde ent\u00e3o \u00e9 utilizado para otimizar a intera\u00e7\u00e3o com os servi\u00e7os do Google. Nesse meio tempo, a vers\u00e3o do QUIC utilizada no Chrome diferiu em alguns detalhes da vers\u00e3o do <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">especifica\u00e7\u00f5es<\/a><\/noindex> IETF, mas agora as implementa\u00e7\u00f5es est\u00e3o sincronizadas.<\/p>\n<p>HTTP\/3 padroniza o uso do QUIC como transporte para HTTP\/2. Para habilitar o HTTP\/3 e a vers\u00e3o do QUIC do <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">23 rascunho<\/a><\/noindex> As especifica\u00e7\u00f5es do IETF requerem que o Chrome seja iniciado com as op\u00e7\u00f5es \u2014enable-quic \u2014quic-version=h3-23, ap\u00f3s o que ao abrir o site de teste <noindex><a rel=\"nofollow\" href=\"https:\/\/quic.rocks:4433\/\">quic.rocks:4433<\/a><\/noindex> no modo de inspe\u00e7\u00e3o de rede nas ferramentas para desenvolvedores, a atividade do HTTP\/3 ser\u00e1 exibida como 'http\/2+quic\/99'.<\/p>\n<p>Vale lembrar que o protocolo <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/quic\/\">QUIC<\/a><\/noindex> (Quick UDP Internet Connections) tem sido desenvolvido pela Google desde 2013 como uma alternativa \u00e0 combina\u00e7\u00e3o TCP+TLS para a Web, resolvendo problemas de alta lat\u00eancia ao estabelecer e negociar conex\u00f5es TCP e eliminando os atrasos causados pela perda de pacotes durante a transmiss\u00e3o de dados. O QUIC \u00e9 uma camada sobre o protocolo UDP, que suporta multiplexa\u00e7\u00e3o de v\u00e1rias conex\u00f5es e oferece m\u00e9todos de criptografia equivalentes ao TLS\/SSL. O protocolo discutido j\u00e1 est\u00e1 integrado na infraestrutura de servidores da Google, faz parte do Chrome, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48312\">programado<\/a><\/noindex> para ser inclu\u00eddo no Firefox e \u00e9 amplamente utilizado para atender as solicita\u00e7\u00f5es dos clientes nos servidores da Google. <\/p>\n<p>Principais <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.google.com\/document\/d\/1lmL9EF6qKrk7gbazY8bIdvq3Pno2Xj_l_YShP40GLQE\/preview?sle=true#\">Caracter\u00edsticas<\/a><\/noindex> QUIC:\n<\/p>\n<ul>\n<li class=\"l\"> Alta seguran\u00e7a, equivalente ao TLS (na pr\u00e1tica, o QUIC possibilita o uso do TLS sobre UDP);\n<\/li>\n<li class=\"l\"> Controle da integridade do fluxo, prevenindo a perda de pacotes;\n<\/li>\n<li class=\"l\"> Capacidade de estabelecer uma conex\u00e3o instantaneamente (0-RTT, em cerca de 75% dos casos, os dados podem ser transmitidos imediatamente ap\u00f3s o envio do pacote de configura\u00e7\u00e3o da conex\u00e3o) e garantir lat\u00eancias m\u00ednimas entre o envio da solicita\u00e7\u00e3o e o recebimento da resposta (RTT, Round Trip Time);\n<\/li>\n<li class=\"l\"> N\u00e3o reutilizar o mesmo n\u00famero de sequ\u00eancia ao retransmitir um pacote, o que ajuda a evitar ambiguidades na identifica\u00e7\u00e3o dos pacotes recebidos e elimina timeouts;\n<\/li>\n<li class=\"l\"> A perda de um pacote afeta apenas a entrega do fluxo relacionado e n\u00e3o interrompe a entrega de dados em fluxos paralelos transmitidos atrav\u00e9s da conex\u00e3o atual;\n<\/li>\n<li class=\"l\"> Mecanismos de corre\u00e7\u00e3o de erros que minimizam atrasos devido \u00e0 retransmiss\u00e3o de pacotes perdidos. Uso de c\u00f3digos especiais de corre\u00e7\u00e3o de erros em n\u00edvel de pacote para reduzir situa\u00e7\u00f5es que exigem a retransmiss\u00e3o de dados de pacotes perdidos.\n<\/li>\n<li class=\"l\"> As fronteiras criptogr\u00e1ficas dos blocos est\u00e3o alinhadas com as fronteiras dos pacotes QUIC, o que reduz o impacto das perdas de pacotes na decodifica\u00e7\u00e3o do conte\u00fado dos pr\u00f3ximos pacotes;\n<\/li>\n<li class=\"l\"> Aus\u00eancia de problemas de bloqueio de fila TCP.\n<\/li>\n<li class=\"l\"> Suporte a identificadores de conex\u00e3o, permitindo reduzir o tempo de estabelecimento de novas conex\u00f5es para clientes m\u00f3veis.\n<\/li>\n<li class=\"l\"> Capacidade de conectar mecanismos avan\u00e7ados de controle de congestionamento.\n<\/li>\n<li class=\"l\"> Uso de t\u00e9cnicas de previs\u00e3o de largura de banda em cada dire\u00e7\u00e3o para garantir a intensidade ideal de envio de pacotes, evitando um estado de sobrecarga em que ocorre a perda de pacotes.\n<\/li>\n<li class=\"l\">  Not\u00e1vel <noindex><a rel=\"nofollow\" href=\"http:\/\/web.cs.wpi.edu\/~claypool\/ms\/quic\/quic-thesis.pdf\">aumento<\/a><\/noindex> de desempenho e capacidade em compara\u00e7\u00e3o ao TCP. Para servi\u00e7os de v\u00eddeo, como o YouTube, a aplica\u00e7\u00e3o do QUIC demonstrou uma redu\u00e7\u00e3o de 30% nas opera\u00e7\u00f5es de buffering durante a reprodu\u00e7\u00e3o de v\u00eddeos.\n<\/li>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <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 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 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