{"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\/it\/blog\/novosti-interneta\/v-chrome-dobavlena-eksperimentalnaya-podderzhka-protokola-http-3","title":{"rendered":"In Chrome \u00e8 stata aggiunta la supporto sperimentale per il protocollo HTTP\/3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nelle versioni sperimentali <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\">aggiunta<\/a><\/noindex> supporto per il protocollo HTTP\/3, che implementa un'astrazione per permettere il funzionamento di HTTP sul protocollo QUIC. Il protocollo QUIC \u00e8 stato integrato nel browser cinque anni fa e da allora viene utilizzato per ottimizzare l'interazione con i servizi Google. Tuttavia, la variante di QUIC utilizzata in Chrome differiva in alcuni dettagli rispetto a quella delle <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">specifiche<\/a><\/noindex> IETF, ma ora le implementazioni sono sincronizzate.<\/p>\n<p>HTTP\/3 standardizza l'uso di QUIC come trasporto per HTTP\/2. Per abilitare HTTP\/3 e la variante QUIC di <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">23 bozza<\/a><\/noindex> \u00c8 necessario avviare Chrome con le opzioni &#171;&#8212;enable-quic &#8212;quic-version=h3-23&#187;, dopo di che, aprendo il sito di test <noindex><a rel=\"nofollow\" href=\"https:\/\/quic.rocks:4433\/\">quic.rocks:4433<\/a><\/noindex> in modalit\u00e0 ispezione della rete negli strumenti per sviluppatori, l'attivit\u00e0 su HTTP\/3 verr\u00e0 visualizzata come &#171;http\/2+quic\/99&#187;.<\/p>\n<p>Ricordiamo che il protocollo <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/quic\/\">QUIC<\/a><\/noindex> (Quick UDP Internet Connections) sviluppato da Google dal 2013 come alternativa alla combinazione TCP+TLS per il web, affronta i problemi di lungo tempo di inizializzazione e negoziazione delle connessioni in TCP, eliminando anche i ritardi causati dalla perdita di pacchetti durante la trasmissione dei dati. QUIC \u00e8 un'estensione del protocollo UDP, supporta il multiplexing di pi\u00f9 connessioni e fornisce metodi di crittografia equivalenti a TLS\/SSL. Questo protocollo \u00e8 gi\u00e0 integrato nell'infrastruttura server di Google ed \u00e8 parte di Chrome, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48312\">programmato<\/a><\/noindex> per la sua attivazione in Firefox ed \u00e8 ampiamente utilizzato per gestire le richieste dei clienti sui server di Google. <\/p>\n<p>Principali <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.google.com\/document\/d\/1lmL9EF6qKrk7gbazY8bIdvq3Pno2Xj_l_YShP40GLQE\/preview?sle=true#\">caratteristiche<\/a><\/noindex> QUIC:\n<\/p>\n<ul>\n<li class=\"l\"> Elevata sicurezza, simile a TLS (in sostanza, QUIC offre la possibilit\u00e0 di utilizzare TLS sopra UDP);\n<\/li>\n<li class=\"l\"> Controllo dell'integrit\u00e0 del flusso, prevenendo la perdita di pacchetti;\n<\/li>\n<li class=\"l\"> Possibilit\u00e0 di stabilire una connessione istantaneamente (0-RTT, in circa il 75% dei casi \u00e8 possibile trasmettere dati subito dopo l'invio del pacchetto di inizializzazione) e garantire latenze minime tra l'invio della richiesta e la ricezione della risposta (RTT, Round Trip Time);\n<\/li>\n<li class=\"l\"> Non utilizzare lo stesso numero di sequenza nella ritrasmissione dei pacchetti, per evitare ambiguit\u00e0 nella determinazione dei pacchetti ricevuti e eliminare i timeout;\n<\/li>\n<li class=\"l\"> La perdita di pacchetti influisce solo sulla consegna del flusso correlato e non interrompe la consegna dei dati nei flussi trasmessi in parallelo attraverso la connessione attuale;\n<\/li>\n<li class=\"l\"> Strumenti di correzione degli errori che minimizzano i ritardi causati dalla ritrasmissione dei pacchetti persi. Utilizzo di codici di correzione degli errori a livello di pacchetto per ridurre le situazioni che richiedono la ritrasmissione dei dati del pacchetto perso.\n<\/li>\n<li class=\"l\"> I confini crittografici dei blocchi sono allineati con i confini dei pacchetti QUIC, riducendo l'impatto delle perdite di pacchetti sulla decodifica del contenuto dei pacchetti successivi;\n<\/li>\n<li class=\"l\"> Assenza di problemi di blocco della coda TCP;\n<\/li>\n<li class=\"l\"> Supporto dell'identificatore della connessione, che consente di ridurre il tempo per stabilire una connessione di ripristino per i clienti mobili;\n<\/li>\n<li class=\"l\"> Possibilit\u00e0 di collegare meccanismi avanzati di controllo della congestione della connessione;\n<\/li>\n<li class=\"l\"> L'uso di tecniche di previsione della capacit\u00e0 in ogni direzione per garantire un'intensit\u00e0 ottimale nell'invio dei pacchetti, evitando di scivolare in uno stato di sovraccarico in cui si verifica la perdita di pacchetti;\n<\/li>\n<li class=\"l\">  Notevole <noindex><a rel=\"nofollow\" href=\"http:\/\/web.cs.wpi.edu\/~claypool\/ms\/quic\/quic-thesis.pdf\">il guadagno<\/a><\/noindex> prestazioni e capacit\u00e0 rispetto a TCP. Per i servizi video, come YouTube, l'applicazione di QUIC ha mostrato una riduzione delle operazioni di buffering durante la visione dei video del 30%.\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 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sopra-strato per garantire il funzionamento di HTTP sopra il protocollo QUIC. Il protocollo QUIC \u00e8 stato aggiunto al browser cinque anni fa ed \u00e8 stato utilizzato da allora per ottimizzare i servizi Google. 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