{"id":99501,"date":"2021-03-21T10:22:35","date_gmt":"2021-03-21T08:22:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-nochnyh-i-beta-sborkah-firefox-vklyuchena-po-umolchaniyu-podderzhka-http-3"},"modified":"2021-03-21T10:22:35","modified_gmt":"2021-03-21T08:22:35","slug":"v-nochnyh-i-beta-sborkah-firefox-vklyuchena-po-umolchaniyu-podderzhka-http-3","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/v-nochnyh-i-beta-sborkah-firefox-vklyuchena-po-umolchaniyu-podderzhka-http-3","title":{"rendered":"O suporte ao HTTP\/3 est\u00e1 ativado por padr\u00e3o nas vers\u00f5es noturnas e beta do Firefox.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nas vers\u00f5es noturnas do Firefox, assim como na vers\u00e3o beta, o suporte ao protocolo HTTP\/3 est\u00e1 ativado por padr\u00e3o. Na vers\u00e3o est\u00e1vel, a ativa\u00e7\u00e3o do HTTP\/3 est\u00e1 prevista para o lan\u00e7amento do Firefox 88, programado para 20 de abril. No Chrome, a ativa\u00e7\u00e3o seletiva do HTTP\/3 come\u00e7ou em outubro de 2020.      <\/p>\n<p>O suporte ao HTTP\/3 no Firefox \u00e9 baseado no projeto neqo, desenvolvido pela Mozilla, que fornece uma implementa\u00e7\u00e3o do cliente e <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/dts-los-angeles\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3679\">servidor<\/a> para o protocolo QUIC. O c\u00f3digo dos componentes para suporte ao HTTP\/3 e QUIC foi escrito na linguagem Rust. Para gerenciar a habilita\u00e7\u00e3o do HTTP\/3 em about:config, h\u00e1 a op\u00e7\u00e3o &#171;network.http.http3.enabled&#187;. A partir do software cliente, o suporte experimental ao HTTP\/3 j\u00e1 foi adicionado no Chrome e no curl, e para  <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1559\">servidores<\/a> dispon\u00edvel no nginx, assim como na forma de m\u00f3dulo nginx e servidor de testes da Cloudflare. V\u00e1rios sites de teste foram lan\u00e7ados para verificar o funcionamento dos clientes HTTP\/3.        <\/p>\n<p>O protocolo HTTP\/3 ainda est\u00e1 em est\u00e1gio de especifica\u00e7\u00e3o preliminar e n\u00e3o est\u00e1 completamente padronizado no IETF. O HTTP\/3 define o uso do protocolo QUIC como transporte para o HTTP\/2. O protocolo QUIC (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 longa lat\u00eancia na configura\u00e7\u00e3o e negocia\u00e7\u00e3o de conex\u00f5es em TCP e eliminando atrasos em casos de perda de pacotes durante a transmiss\u00e3o de dados. O QUIC \u00e9 uma camada sobre o protocolo UDP, suportando multiplexa\u00e7\u00e3o de v\u00e1rias conex\u00f5es e fornecendo m\u00e9todos de criptografia equivalentes a TLS\/SSL. Durante o desenvolvimento da norma no IETF, altera\u00e7\u00f5es foram feitas no protocolo, o que resultou em duas ramifica\u00e7\u00f5es existentes paralelamente, uma para o HTTP\/3 e a outra suportada pela Google (o Chrome suporta ambas as vers\u00f5es).     <\/p>\n<p>Principais caracter\u00edsticas do QUIC:  <\/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);  <\/li>\n<li class=\"l\"> Controle da integridade do fluxo, prevenindo a perda de pacotes;    <\/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);    <\/li>\n<li class=\"l\"> Uso de um n\u00famero de sequ\u00eancia diferente para retransmiss\u00e3o de pacotes, o que permite evitar ambiguidades na determina\u00e7\u00e3o dos pacotes recebidos e eliminar timeouts;  <\/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;    <\/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.   <\/li>\n<li class=\"l\"> Os limites dos blocos criptogr\u00e1ficos est\u00e3o alinhados com os limites dos pacotes QUIC, o que diminui o impacto da perda de pacotes na decodifica\u00e7\u00e3o do conte\u00fado dos pacotes subsequentes.    <\/li>\n<li class=\"l\"> Aus\u00eancia de problemas de bloqueio de fila TCP.    <\/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.  <\/li>\n<li class=\"l\"> Capacidade de conectar mecanismos avan\u00e7ados de controle de congestionamento.  <\/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.    <\/li>\n<li class=\"l\">  Um aumento significativo de desempenho e largura de banda, em compara\u00e7\u00e3o com o TCP. Para servi\u00e7os de v\u00eddeo, como o YouTube, a aplica\u00e7\u00e3o do QUIC mostrou uma redu\u00e7\u00e3o de 30% nas opera\u00e7\u00f5es de buffer durante a exibi\u00e7\u00e3o de v\u00eddeos.          <\/li>\n<\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54801\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043d\u043e\u0447\u043d\u044b\u0445 \u0441\u0431\u043e\u0440\u043a\u0430\u0445 Firefox, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0432 \u0431\u0435\u0442\u0430-\u0432\u0435\u0440\u0441\u0438\u0438 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 HTTP\/3. \u0412 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0435 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 HTTP\/3 \u043d\u0430\u043c\u0435\u0447\u0435\u043d\u043e \u043d\u0430 \u0432\u044b\u043f\u0443\u0441\u043a Firefox 88, \u0437\u0430\u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043d\u0430 20 \u0430\u043f\u0440\u0435\u043b\u044f. \u0412 Chrome \u0432\u044b\u0431\u043e\u0440\u043e\u0447\u043d\u0430\u044f \u0430\u043a\u0442\u0438\u0432\u0430\u0446\u0438\u044f HTTP\/3 \u043d\u0430\u0447\u0430\u043b\u0430\u0441\u044c \u0432 \u043e\u043a\u0442\u044f\u0431\u0440\u0435 2020 \u0433\u043e\u0434\u0430. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 HTTP\/3 \u0432 Firefox \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u043c \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Mozilla \u043f\u0440\u043e\u0435\u043a\u0442\u0435 neqo, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u043c \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f [&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-99501","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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