{"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\/da\/blog\/news\/v-chrome-dobavlena-eksperimentalnaya-podderzhka-protokola-http-3","title":{"rendered":"Eksperimentel underst\u00f8ttelse af HTTP\/3-protokollen tilf\u00f8jet i Chrome","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I eksperimentelle versioner <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\">tilf\u00f8jet<\/a><\/noindex> underst\u00f8ttelse af HTTP\/3-protokollen, der implementerer en overbygning for at sikre HTTP-arbejde over QUIC-protokollen. Selve QUIC-protokollen blev tilf\u00f8jet til browseren for fem \u00e5r siden og har siden da v\u00e6ret brugt til at optimere ydeevnen med Googles tjenester. Den version af QUIC, der blev brugt i Chrome, adskilte sig dog i nogle detaljer fra versionen fra <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">specifikationerne<\/a><\/noindex> IETF, men nu er implementeringerne synkroniseret.<\/p>\n<p>HTTP\/3 standardiserer brugen af QUIC som transport for HTTP\/2. For at aktivere HTTP\/3 og QUIC-versionen fra <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport-23\">det 23. udkast<\/a><\/noindex> IETF-specifikationer kr\u00e6ver, at Chrome startes med indstillingerne &#171;&#8212;enable-quic &#8212;quic-version=h3-23&#187;, hvorefter testwebstedet \u00e5bnes. <noindex><a rel=\"nofollow\" href=\"https:\/\/quic.rocks:4433\/\">quic.rocks:4433<\/a><\/noindex> I netv\u00e6rksinspektionsmodus i udviklerv\u00e6rkt\u00f8jerne vises aktiviteten for HTTP\/3 som &#171;http\/2+quic\/99&#187;.<\/p>\n<p>Det skal bem\u00e6rkes, at protokollen <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/quic\/\">QUIC<\/a><\/noindex> (Quick UDP Internet Connections) er siden 2013 blevet udviklet af Google som et alternativ til TCP+TLS for web, der l\u00f8ser problemer med lang ops\u00e6tnings- og forhandlingsforbindelse i TCP og eliminerer forsinkelser ved tab af pakker under datatransmission. QUIC er en overbygning p\u00e5 UDP-protokollen, der underst\u00f8tter multiplexing af flere forbindelser og tilbyder krypteringsmetoder svarende til TLS\/SSL. Den n\u00e6vnte protokol er allerede integreret i Googles serverinfrastruktur, er en del af Chrome, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48312\">er planlagt<\/a><\/noindex> for at blive aktiveret i Firefox og anvendes aktivt til at betjene kundeanmodninger p\u00e5 Googles servere. <\/p>\n<p>Vigtige <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.google.com\/document\/d\/1lmL9EF6qKrk7gbazY8bIdvq3Pno2Xj_l_YShP40GLQE\/preview?sle=true#\">funktioner<\/a><\/noindex> QUIC:\n<\/p>\n<ul>\n<li class=\"l\"> H\u00f8j sikkerhed svarende til TLS (faktisk giver QUIC mulighed for brug af TLS oven p\u00e5 UDP);\n<\/li>\n<li class=\"l\"> Overv\u00e5gning af str\u00f8mmens integritet, der forhindrer tab af pakker;\n<\/li>\n<li class=\"l\"> Mulighed for straks at etablere forbindelse (0-RTT, i ca. 75% af tilf\u00e6ldene kan data overf\u00f8res straks efter sending af forbindelsespakken) og sikre minimale forsinkelser mellem fremsendelse af anmodning og modtagelse af svar (RTT, Round Trip Time);\n<\/li>\n<li class=\"l\"> Undg\u00e5else af at bruge den samme sekvensnummer ved genoverf\u00f8rsel af pakken, hvilket forhindrer tvetydighed ved identifikation af modtagne pakker og eliminerer timeouts;\n<\/li>\n<li class=\"l\"> Pakketab p\u00e5virker kun leveringen af den tilknyttede str\u00f8m og stopper ikke dataoverf\u00f8rslen i parallelt overf\u00f8rte str\u00f8mme gennem den aktuelle forbindelse;\n<\/li>\n<li class=\"l\"> Fejlkorrektionsmidler, der minimerer forsinkelser p\u00e5 grund af genoverf\u00f8rsel af tabte pakker. Brug af specialiserede fejlkorrektionskoder p\u00e5 pakkeniveau for at reducere situationer, der kr\u00e6ver genoverf\u00f8rsel af data fra en tabt pakke.\n<\/li>\n<li class=\"l\"> Kryptografiske gr\u00e6nser for blokke er justeret med gr\u00e6nserne for QUIC-pakker, hvilket reducerer indflydelsen af pakke-tab p\u00e5 dekodningen af indholdet i de efterf\u00f8lgende pakker;\n<\/li>\n<li class=\"l\"> Ingen problemer med TCP-k\u00f8blokering;\n<\/li>\n<li class=\"l\"> Underst\u00f8ttelse af forbindelsesidentifikatoren, der reducerer tiden til at etablere en genforbindelse for mobile klienter;\n<\/li>\n<li class=\"l\"> Mulighed for at tilslutte udvidede mekanismer til overv\u00e5gning af forbindelsesoverbelastning;\n<\/li>\n<li class=\"l\"> Brug af kapacitetsprognoseteknikker i hver retning for at sikre optimal intensitet i pakkeafsendelsen, hvilket forhindrer at glide ind i en overbelastningssituation, hvor pakkemister forekommer;\n<\/li>\n<li class=\"l\">  Bem\u00e6rkbar <noindex><a rel=\"nofollow\" href=\"http:\/\/web.cs.wpi.edu\/~claypool\/ms\/quic\/quic-thesis.pdf\">v\u00e6kst<\/a><\/noindex> i ydeevne og kapacitet sammenlignet med TCP. For videotjenester som YouTube har brugen af QUIC vist sig at reducere genbufferingsoperationer med 30% under videovisning.\n<\/li>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Kilde: <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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\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 \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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