{"id":79868,"date":"2020-05-01T07:42:17","date_gmt":"2020-05-01T05:42:17","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/microsoft-otkryl-svoyu-realizacziyu-protokola-quic-primenyaemogo-v-http-3"},"modified":"2020-05-01T07:42:17","modified_gmt":"2020-05-01T05:42:17","slug":"microsoft-otkryl-svoyu-realizacziyu-protokola-quic-primenyaemogo-v-http-3","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/microsoft-otkryl-svoyu-realizacziyu-protokola-quic-primenyaemogo-v-http-3","title":{"rendered":"Microsoft a lansat implementarea sa a protocolului QUIC, utilizat \u00een HTTP\/3.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Compania Microsoft <noindex><a rel=\"nofollow\" href=\"https:\/\/techcommunity.microsoft.com\/t5\/networking-blog\/msquic-is-open-source\/ba-p\/1345441\">a anun\u021bat<\/a><\/noindex> despre deschiderea codului bibliotecii <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/microsoft\/msquic\">MsQuic<\/a><\/noindex> cu implementarea protocolului de re\u021bea <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-quic-transport\">QUIC<\/a><\/noindex>. Codul este scris \u00een limbajul C \u0219i <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/microsoft\/msquic\">se r\u0103sp\u00e2nde\u0219te<\/a><\/noindex> sub licen\u021ba MIT. Biblioteca este multiplatform\u0103 \u0219i poate fi utilizat\u0103 nu doar pe Windows, ci \u0219i pe Linux cu ajutorul <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.microsoft.com\/en-us\/windows\/win32\/com\/schannel\">Schannel<\/a><\/noindex> sau OpenSSL pentru TLS 1.3. \u00cen continuare, se preconizeaz\u0103 suport pentru alte platforme.<\/p>\n<p>Biblioteca se bazeaz\u0103 pe codul driver-ului msquic.sys, furnizat \u00een nucleul Windows 10 (Insider Preview) pentru a asigura func\u021bionarea protocoalelor HTTP \u0219i <noindex><a rel=\"nofollow\" href=\"https:\/\/techcommunity.microsoft.com\/t5\/itops-talk-blog\/smb-over-quic-files-without-the-vpn\/ba-p\/1183449\">SMB<\/a><\/noindex> peste QUIC. De asemenea, codul este folosit pentru implementarea HTTP\/3 \u00een stiva intern\u0103 Windows \u0219i \u00een .NET Core. Dezvoltarea bibliotecii MsQuic va fi desf\u0103\u0219urat\u0103 complet pe GitHub, folosind revizuire public\u0103, pull requests \u0219i GitHub Issues. A fost preg\u0103tit\u0103 o infrastructur\u0103 care verific\u0103 fiecare commit \u0219i pull request \u00eentr-un set de peste 4000 de teste. Dup\u0103 stabilizarea mediului de dezvoltare, se preconizeaz\u0103 acceptarea modific\u0103rilor din partea dezvoltatorilor ter\u021bi.<\/p>\n<p>MsQuic poate fi deja utilizat pentru crearea serverelor \u0219i clien\u021bilor, dar nu toat\u0103 func\u021bionalitatea definit\u0103 \u00een specifica\u021bia IETF este \u00een prezent disponibil\u0103. De exemplu, \u00een prezent nu exist\u0103 suport pentru 0-RTT, migrarea clien\u021bilor, Descoperirea Path MTU \u0219i gestionarea preferin\u021belor de adres\u0103 pentru server (Server Preferred Address). Din caracteristicile implementate se remarc\u0103 optimizarea pentru a atinge l\u0103\u021bimi de band\u0103 maxime \u0219i \u00eent\u00e2rzieri minime, suport pentru intrare\/ie\u0219ire asincron, RSS (Receive Side Scaling), capacitatea de a combina fluxurile UDP de intrare \u0219i ie\u0219ire. Implementarea MsQuic a fost verificat\u0103 pentru compatibilitatea cu ramurile experimentale ale browserelor Chrome \u0219i Edge.<\/p>\n<p>Reamintim c\u0103 HTTP\/3 standardizeaz\u0103 utilizarea protocolului QUIC ca transport pentru HTTP\/2. Protocolul <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/quic\/\">QUIC<\/a><\/noindex> (Quick UDP Internet Connections) evolueaz\u0103 din 2013 de c\u0103tre compania Google ca o alternativ\u0103 la combina\u021bia TCP+TLS pentru Web, rezolv\u00e2nd problemele cu timpi mari de stabilire \u0219i negociere a conexiunilor \u00een TCP \u0219i elimin\u00e2nd \u00eent\u00e2rzierile cauzate de pierderea pachetelor \u00een timpul transferului de date. QUIC este o suprastructur\u0103 peste protocolul UDP, care suport\u0103 multiplexarea mai multor conexiuni \u0219i ofer\u0103 metode de criptare echivalente cu TLS\/SSL. <\/p>\n<p>Principalele <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.google.com\/document\/d\/1lmL9EF6qKrk7gbazY8bIdvq3Pno2Xj_l_YShP40GLQE\/preview?sle=true#\">grafica realizat\u0103 prin WebGL \u0219i<\/a><\/noindex> QUIC:\n<\/p>\n<ul>\n<li class=\"l\"> Siguran\u021b\u0103 ridicat\u0103, similar\u0103 TLS (\u00een esen\u021b\u0103 QUIC ofer\u0103 posibilitatea utiliz\u0103rii TLS 1.3 peste UDP);\n<\/li>\n<li class=\"l\"> Controlul integrit\u0103\u021bii fluxului, prevenind pierderea pachetelor;\n<\/li>\n<li class=\"l\"> Posibilitatea de a stabili instantaneu o conexiune (0-RTT, \u00een aproximativ 75% din cazuri, datele pot fi transmise imediat dup\u0103 trimiterea pachetului de stabilire a conexiunii) \u0219i de a asigura \u00eent\u00e2rzieri minime \u00eentre trimiterea cererii \u0219i primirea r\u0103spunsului (RTT, Round Trip Time);<br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/lh3.googleusercontent.com\/o62Ohn1Ppxna6zz0NtavqRyetjryOj-81Sz4bRt3U8lURVblk5RKOaCcf57i6BkmprremePJpq_sQcxfJiuA4wJBmRp3pR4BS1P-yiT6UNUPvnBeP_rLz9bvHxFE15kuNBM2hpE?a.png\"><img decoding=\"async\" alt=\"Microsoft a lansat implementarea sa a protocolului QUIC, utilizat \u00een HTTP\/3.\" src=\"\/wp-content\/uploads\/2020\/05\/1cdf7d0f9fe23fbbdc72416d51adebfe.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<\/li>\n<li class=\"l\"> Neutilizarea la retransmiterea pachetului cu acela\u0219i num\u0103r de secven\u021b\u0103, ceea ce permite evitarea ambiguit\u0103\u021bilor \u00een determinarea pachetelor primite \u0219i eliminarea timeout-urilor;\n<\/li>\n<li class=\"l\"> Pierderea unui pachet afecteaz\u0103 livrarea doar a fluxului asociat \u0219i nu opre\u0219te livrarea datelor \u00een fluxurile transmise \u00een paralel prin conexiunea curent\u0103;\n<\/li>\n<li class=\"l\"> Mijloace de corectare a erorilor, care minimizeaz\u0103 \u00eent\u00e2rzierile cauzate de retransmisia pachetelor pierdute. Utilizarea unor coduri speciale de corectare a erorilor la nivel de pachet pentru a reduce situa\u021biile care necesit\u0103 retransmiterea datelor din pachetul pierdut.\n<\/li>\n<li class=\"l\"> Limitele blocurilor criptografice sunt aliniate cu limitele pachetelor QUIC, ceea ce reduce impactul pierderilor de pachete asupra decodific\u0103rii con\u021binutului pachetelor urm\u0103toare;\n<\/li>\n<li class=\"l\"> Lipsa problemelor cu blocarea cozii TCP;\n<\/li>\n<li class=\"l\"> Suport pentru identificatorul de conexiune, care permite reducerea timpului de reinstaurare a conexiunii pentru clien\u021bi mobile;\n<\/li>\n<li class=\"l\"> Posibilitatea de a activa mecanisme extinse de control al supra\u00eenc\u0103rc\u0103rii conexiunii;\n<\/li>\n<li class=\"l\"> Utilizarea tehnicii de previzionare a capacit\u0103\u021bii de transmisie \u00een fiecare direc\u021bie pentru a asigura o intensitate optim\u0103 a trimiterii pachetelor, prevenind astfel ajungerea \u00eentr-o stare de supra\u00eenc\u0103rcare, \u00een care se observ\u0103 pierderi de pachete;\n<\/li>\n<li class=\"l\">  Un salt semnificativ <noindex><a rel=\"nofollow\" href=\"http:\/\/web.cs.wpi.edu\/~claypool\/ms\/quic\/quic-thesis.pdf\">\u00een performan\u021b\u0103<\/a><\/noindex> \u0219i l\u0103\u021bime de band\u0103, comparativ cu TCP. Pentru serviciile video, cum ar fi YouTube, utilizarea QUIC a ar\u0103tat o reducere a opera\u021biunilor de rebuffering \u00een timpul vizion\u0103rii video cu 30%.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Sursa: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52844\">opennet.ro<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Microsoft \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0430 \u043e\u0431 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u0438 \u043a\u043e\u0434\u0430 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 MsQuic \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 QUIC. \u041a\u043e\u0434 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 \u0421\u0438 \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 MIT. \u0411\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u043a\u0440\u043e\u0441\u0441\u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0435\u043d\u043d\u0430\u044f \u0438 \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \u0432 Windows, \u043d\u043e \u0438 \u0432 Linux \u0441 \u0437\u0430\u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u0438\u0435\u043c Schannel \u0438\u043b\u0438 OpenSSL \u0434\u043b\u044f TLS 1.3. \u0412 \u0434\u0430\u043b\u044c\u043d\u0435\u0439\u0448\u0435\u043c \u043f\u043b\u0430\u043d\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c. \u0411\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 \u043a\u043e\u0434\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":79869,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-79868","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Microsoft \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0430 \u043e\u0431 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u0438 \u043a\u043e\u0434\u0430 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