{"id":99904,"date":"2021-04-17T10:22:46","date_gmt":"2021-04-17T08:22:46","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vklyuchenie-podderzhki-http-3-v-firefox-namecheno-na-konecz-maya"},"modified":"2021-04-17T10:22:46","modified_gmt":"2021-04-17T08:22:46","slug":"vklyuchenie-podderzhki-http-3-v-firefox-namecheno-na-konecz-maya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/vklyuchenie-podderzhki-http-3-v-firefox-namecheno-na-konecz-maya","title":{"rendered":"Zah\u00e1jen\u00ed podpory HTTP\/3 v prohl\u00ed\u017ee\u010di Firefox je pl\u00e1nov\u00e1no na konec kv\u011btna.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Spole\u010dnost Mozilla ozn\u00e1mila sv\u016fj z\u00e1m\u011br zah\u00e1jit postupn\u00e9 zap\u00edn\u00e1n\u00ed protokol\u016f HTTP\/3 a QUIC ve verzi Firefox 88, pl\u00e1novan\u00e9 na 19. dubna (p\u016fvodn\u011b se o\u010dek\u00e1valo, \u017ee vyd\u00e1n\u00ed prob\u011bhne 20. dubna, ale podle rozvrhu se posune o jeden den). Zpo\u010d\u00e1tku bude podpora HTTP\/3 aktivov\u00e1na pouze pro mal\u00e9 procento u\u017eivatel\u016f a pokud nenastanou ne\u010dekan\u00e9 probl\u00e9my, bude roz\u0161\u00ed\u0159ena na v\u0161echny do konce kv\u011btna. V no\u010dn\u00edch verz\u00edch a beta verz\u00edch byl HTTP\/3 standardn\u011b zapnut na konci b\u0159ezna.    <\/p>\n<p>P\u0159ipom\u00edn\u00e1me, \u017ee implementace HTTP\/3 v prohl\u00ed\u017ee\u010di Firefox je zalo\u017eena na projektu neqo, kter\u00fd rozv\u00edj\u00ed spole\u010dnost Mozilla a poskytuje implementaci klienta a <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-los-angeles\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3702\">serveru<\/a> protokol QUIC. K\u00f3d komponent\u016f na podporu HTTP\/3 a QUIC je naps\u00e1n v jazyce Rust. Pro \u0159\u00edzen\u00ed zap\u00edn\u00e1n\u00ed HTTP\/3 v about:config je k dispozici mo\u017enost \u201enetwork.http.http3.enabled\u201c. Experiment\u00e1ln\u00ed podpora HTTP\/3 byla tak\u00e9 p\u0159id\u00e1na do klientsk\u00e9ho softwaru Chrome a curl, a pro  <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/\"   title=\"servery\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1572\">servery<\/a> je dostupn\u00e1 v nginx, stejn\u011b jako ve form\u011b nginx modulu a testovac\u00edho serveru od spole\u010dnosti Cloudflare. Na stran\u011b web\u016f je podpora HTTP\/3 ji\u017e zaji\u0161t\u011bna na serverech Google a Facebook.     <\/p>\n<p>Protokol HTTP\/3 je zat\u00edm ve f\u00e1zi n\u00e1vrhu a nebyl je\u0161t\u011b definitivn\u011b standardizov\u00e1n v IETF. Pro pou\u017eit\u00ed HTTP\/3 je vy\u017eadov\u00e1na podpora na stran\u011b klienta a serveru shodn\u00e9ho verze n\u00e1vrhu protokolu QUIC a HTTP\/3, kter\u00e1 je uvedena v hlavi\u010dce Alt-Svc (Firefox podporuje n\u00e1vrhy specifikac\u00ed od 27 do 32).            <\/p>\n<p>HTTP\/3 definuje pou\u017e\u00edt\u00ed protokolu QUIC jako transport pro HTTP\/2. Protokol QUIC (Quick UDP Internet Connections) se od roku 2013 vyv\u00edj\u00ed spole\u010dnost\u00ed Google jako alternativa k kombinaci TCP+TLS pro Web, \u0159e\u0161\u00edc\u00ed probl\u00e9my s vysokou latenc\u00ed p\u0159i navazov\u00e1n\u00ed a vyjedn\u00e1v\u00e1n\u00ed spojen\u00ed v TCP a eliminuj\u00edc\u00ed zpo\u017ed\u011bn\u00ed p\u0159i ztr\u00e1t\u011b paket\u016f b\u011bhem p\u0159enosu dat. QUIC p\u0159edstavuje nadstavbu nad protokolem UDP, kter\u00e1 podporuje multiplexov\u00e1n\u00ed v\u00edce p\u0159ipojen\u00ed a poskytuje \u0161ifrovac\u00ed metody ekvivalentn\u00ed TLS\/SSL. B\u011bhem v\u00fdvoje standardu v IETF byly do protokolu provedeny zm\u011bny, co\u017e vedlo k vytvo\u0159en\u00ed dvou paraleln\u011b existuj\u00edc\u00edch v\u011btv\u00ed, jedn\u00e9 pro HTTP\/3 a druh\u00e9, kter\u00e1 je podporov\u00e1na Googlem (Chrome podporuje ob\u011b varianty).    <\/p>\n<p>Hlavn\u00ed vlastnosti QUIC:  <\/p>\n<ul>\n<li class=\"l\"> Vysok\u00e1 bezpe\u010dnost, srovnateln\u00e1 s TLS (v podstat\u011b QUIC poskytuje mo\u017enost pou\u017eit\u00ed TLS nad UDP);  <\/li>\n<li class=\"l\"> Kontrola integrity toku, kter\u00e1 zabra\u0148uje ztr\u00e1t\u011b paket\u016f;    <\/li>\n<li class=\"l\"> Mo\u017enost okam\u017eit\u00e9ho nav\u00e1z\u00e1n\u00ed p\u0159ipojen\u00ed (0-RTT, v p\u0159ibli\u017en\u011b 75 % p\u0159\u00edpad\u016f lze data odes\u00edlat ihned po odesl\u00e1n\u00ed bal\u00ed\u010dku pro nav\u00e1z\u00e1n\u00ed p\u0159ipojen\u00ed) a zaji\u0161t\u011bn\u00ed minim\u00e1ln\u00edch zpo\u017ed\u011bn\u00ed mezi odesl\u00e1n\u00edm \u017e\u00e1dosti a p\u0159\u00edjmem odpov\u011bdi (RTT, Round Trip Time);    <\/li>\n<li class=\"l\"> Pou\u017eit\u00ed p\u0159i op\u011btovn\u00e9m p\u0159enosu paketu jin\u00e9ho po\u0159adov\u00e9ho \u010d\u00edsla, co\u017e umo\u017e\u0148uje vyhnout se nejasnostem p\u0159i ur\u010den\u00ed p\u0159ijat\u00fdch paket\u016f a zbavit se \u010dasov\u00fdch limit\u016f;  <\/li>\n<li class=\"l\"> Ztr\u00e1ta paketu ovliv\u0148uje doru\u010den\u00ed pouze souvisej\u00edc\u00edho toku a nezastavuje doru\u010den\u00ed dat v paraleln\u011b p\u0159en\u00e1\u0161en\u00fdch toc\u00edch p\u0159es aktu\u00e1ln\u00ed spojen\u00ed;    <\/li>\n<li class=\"l\"> N\u00e1stroje pro opravu chyb, kter\u00e9 minimalizuj\u00ed zpo\u017ed\u011bn\u00ed zp\u016fsoben\u00e9 op\u011btovn\u00fdm p\u0159enosem ztracen\u00fdch paket\u016f. Vyu\u017eit\u00ed speci\u00e1ln\u00edch chybov\u00fdch k\u00f3d\u016f na \u00farovni paket\u016f pro sn\u00ed\u017een\u00ed situac\u00ed, kter\u00e9 vy\u017eaduj\u00ed op\u011btovn\u00fd p\u0159enos dat ztracen\u00e9ho paketu.   <\/li>\n<li class=\"l\"> Hranice kryptografick\u00fdch blok\u016f jsou slad\u011bny s hranicemi paket\u016f QUIC, co\u017e sni\u017euje dopad ztr\u00e1ty paket\u016f na dek\u00f3dov\u00e1n\u00ed obsahu n\u00e1sleduj\u00edc\u00edch paket\u016f;    <\/li>\n<li class=\"l\"> \u017d\u00e1dn\u00e9 probl\u00e9my s blokov\u00e1n\u00edm front TCP;    <\/li>\n<li class=\"l\"> Podpora identifik\u00e1toru spojen\u00ed, kter\u00e1 sni\u017euje \u010das pot\u0159ebn\u00fd k op\u011btovn\u00e9mu nav\u00e1z\u00e1n\u00ed spojen\u00ed pro mobiln\u00ed klienty;  <\/li>\n<li class=\"l\"> Mo\u017enost p\u0159ipojen\u00ed roz\u0161\u00ed\u0159en\u00fdch mechanism\u016f \u0159\u00edzen\u00ed p\u0159et\u00ed\u017een\u00ed spojen\u00ed;  <\/li>\n<li class=\"l\"> Pou\u017eit\u00ed techniky predikce \u0161\u00ed\u0159ky p\u00e1sma v ka\u017ed\u00e9m sm\u011bru pro zaji\u0161t\u011bn\u00ed optim\u00e1ln\u00ed intenzity odes\u00edl\u00e1n\u00ed paket\u016f, co\u017e zabra\u0148uje p\u0159echodu do stavu p\u0159et\u00ed\u017een\u00ed, ve kter\u00e9m doch\u00e1z\u00ed ke ztr\u00e1t\u011b paket\u016f;    <\/li>\n<li class=\"l\">  V\u00fdrazn\u00fd n\u00e1r\u016fst v\u00fdkonu a propustnosti ve srovn\u00e1n\u00ed s TCP. Pro video slu\u017eby, jako je YouTube, pou\u017eit\u00ed QUIC uk\u00e1zalo sn\u00ed\u017een\u00ed operac\u00ed op\u011btovn\u00e9ho buffrov\u00e1n\u00ed p\u0159i sledov\u00e1n\u00ed videa o 30%.          <\/li>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54979\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Mozilla \u0441\u043e\u043e\u0431\u0449\u0438\u043b\u0430 \u043e \u043d\u0430\u043c\u0435\u0440\u0435\u043d\u0438\u0438 \u043d\u0430\u0447\u0430\u0442\u044c \u043f\u043e\u044d\u0442\u0430\u043f\u043d\u043e\u0435 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432 HTTP\/3 \u0438 QUIC \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 Firefox 88, \u043d\u0430\u043c\u0435\u0447\u0435\u043d\u043d\u043e\u043c \u043d\u0430 19 \u0430\u043f\u0440\u0435\u043b\u044f (\u0438\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e, \u0440\u0435\u043b\u0438\u0437 \u043e\u0436\u0438\u0434\u0430\u043b\u0441\u044f 20 \u0430\u043f\u0440\u0435\u043b\u044f, \u043d\u043e, \u0441\u0443\u0434\u044f \u043f\u043e \u0433\u0440\u0430\u0444\u0438\u043a\u0443, \u0441\u0434\u0432\u0438\u043d\u0443\u0442 \u043d\u0430 \u043e\u0434\u0438\u043d \u0434\u0435\u043d\u044c). \u0412\u043d\u0430\u0447\u0430\u043b\u0435 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 HTTP\/3 \u0431\u0443\u0434\u0435\u0442 \u0430\u043a\u0442\u0438\u0432\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u043b\u0438\u0448\u044c \u0434\u043b\u044f \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0433\u043e \u043f\u0440\u043e\u0446\u0435\u043d\u0442\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438, \u0435\u0441\u043b\u0438 \u043d\u0435 \u0432\u043e\u0437\u043d\u0438\u043a\u043d\u0435\u0442 \u043d\u0435\u043f\u0440\u0435\u0434\u0432\u0438\u0434\u0435\u043d\u043d\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c, \u0431\u0443\u0434\u0435\u0442 \u0434\u043e\u0432\u0435\u0434\u0435\u043d\u0430 \u0434\u043e \u0432\u0441\u0435\u0445 \u043a \u043a\u043e\u043d\u0446\u0443 [&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-99904","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=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Mozilla \u0441\u043e\u043e\u0431\u0449\u0438\u043b\u0430 \u043e \u043d\u0430\u043c\u0435\u0440\u0435\u043d\u0438\u0438 \u043d\u0430\u0447\u0430\u0442\u044c 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