{"id":7500,"date":"2016-01-27T12:22:59","date_gmt":"2016-01-27T11:22:59","guid":{"rendered":"https:\/\/www.websupport.sk\/blog\/?p=7500"},"modified":"2025-03-11T21:06:40","modified_gmt":"2025-03-11T20:06:40","slug":"nasadili-sme-rychlejsie-a-bezpecnejsie-http2","status":"publish","type":"post","link":"https:\/\/www.websupport.sk\/blog\/2016\/01\/nasadili-sme-rychlejsie-a-bezpecnejsie-http2\/","title":{"rendered":"Nasadili sme r\u00fdchlej\u0161ie a bezpe\u010dnej\u0161ie HTTP\/2"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\"><b>Doba \u010d\u00edtania:<\/b><\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">min.<\/span><\/span><p>Super spr\u00e1va pre v\u0161etk\u00fdch z\u00e1kazn\u00edkov. V\u00e4\u010d\u0161ina str\u00e1nok na zdie\u013eanom hostingu s SSL certifik\u00e1tom je u\u017e nieko\u013eko dn\u00ed dostupn\u00e1 cez nov\u00fd protokol HTTP\/2. Novinka s\u013eubuje v\u00e4\u010d\u0161iu r\u00fdchlos\u0165 a bezpe\u010dnos\u0165.<\/p>\n<p>Len m\u00e1lo\u010do dok\u00e1\u017ee vystihn\u00fa\u0165 pojem dynamika tak dokonale ako internet. Virtu\u00e1lne miesto, kde sa trendy menia zo d\u0148a na de\u0148 na takmer v\u0161etk\u00fdch \u00farovniach. Web je stelesnen\u00edm superr\u00fdchlej evol\u00facie. Bohu\u017eia\u013e, jedna vec a\u017e dodnes dlh\u00e9 roky zaost\u00e1vala. Paradoxne bola jej absol\u00fatnym z\u00e1kladom. Protokol HTTP.<\/p>\n<p>HTTP (Hypertext Transfer Protocol) patr\u00ed medzi aplika\u010dn\u00e9 protokoly. Komunikuje pod\u013ea modelu klient &#8211; server, \u010di\u017ee v jednoduchosti vysvetlen\u00e9, internetov\u00fd prehliada\u010d si od webservera vyp\u00fdta obsah str\u00e1nky a t\u00e1 mu je zaslan\u00e1. Implement\u00e1cia HTTP vo verzii 1.1 je z roku 1999, \u010do sa d\u00e1 z dne\u0161n\u00e9ho poh\u013eadu poklada\u0165 za pravek. Dnes s\u00fa weby komplikovanej\u0161ie, poskladan\u00e9 z mno\u017estva statick\u00e9ho obsahu ako CSS, obr\u00e1zkov a JavaScriptov. Nielen t\u00fdmto v\u00fdzvam m\u00e1 \u010deli\u0165 nov\u00e1 verzia HTTP\/2, ktor\u00e1 je \u0161tandardom u\u017e od m\u00e1ja minul\u00e9ho roka.<\/p>\n<h2>Hist\u00f3ria<\/h2>\n<p>Za ideu a realiz\u00e1ciu HTTP\/2 sa d\u00e1 prip\u00edsa\u0165 nemal\u00e1 z\u00e1sluha Googlu. T\u00e1to spolo\u010dnos\u0165 u\u017e v roku 2012 predstavila svoj vlastn\u00fd otvoren\u00fd protokol SPDY, ktor\u00fd mal prinies\u0165 ni\u017e\u0161iu latenciu a vy\u0161\u0161iu bezpe\u010dnos\u0165. Oba body sa mu podarilo splni\u0165 pomocou kompresie, multiplexingu, prioritiz\u00e1cii a vy\u017eadovan\u00edm TLS.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/vEYKRhETy4A\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>SPDY mal podporu na strane webov\u00fdch serverov ako Nginx a Apache (mod_spdy), ale aj na strane prehliada\u010dov. Google Chrome asi nie je prekvapen\u00edm, no pozn\u00e1 ho aj Opera, Firefox, Safari \u010di Internet Explorer. Ke\u010f\u017ee je u\u017e HTTP\/2 schv\u00e1len\u00fd ako \u0161tandard, Google tento rok SPDY ako projekt ukon\u010d\u00ed &#8211; u\u017e ho nebude treba.<br \/>\nZa HTTP\/2 stoj\u00ed pracovn\u00e1 skupina <a href=\"https:\/\/http2.github.io\/#snip=false\" target=\"_blank\" rel=\"noopener noreferrer\">HTTP<\/a> z The Internet Engineering Task Force (IETF). Ke\u010f bola podan\u00e1 v\u00fdzva na predkladanie n\u00e1vrhov na nov\u00fd protokol, tak SPDY bol viac-menej jasnou vo\u013ebou a \u013eudia z Googlu priamo pracovali na HTTP\/2. Ako u\u017e bolo spomenut\u00e9, tak v m\u00e1ji 2015 uzrelo svetlo sveta <a href=\"https:\/\/tools.ietf.org\/html\/rfc7540\/#snip=false\" target=\"_blank\" rel=\"noopener noreferrer\">RFC 7540<\/a> a <a href=\"https:\/\/tools.ietf.org\/html\/rfc7541\/#snip=false\" target=\"_blank\" rel=\"noopener noreferrer\">RFC 7541<\/a>, ktor\u00e9 popisuj\u00fa kompresiu hlavi\u010diek HPACK.<\/p>\n<h2><b>Rozdiel oproti HTTP\/1.1<\/b><\/h2>\n<p>HTTP\/2 nie je \u00faplne novou implement\u00e1ciou protokolu. Je len vylep\u0161en\u00edm a roz\u0161\u00edren\u00edm, aby jeho s\u00e9mantika, met\u00f3dy a statusov\u00e9 k\u00f3dy zostali zachovan\u00e9. Existuj\u00fa v\u0161ak z\u00e1sadn\u00e9 veci, v ktor\u00fdch sa <a href=\"https:\/\/http2.github.io\/faq\/\" target=\"_blank\" rel=\"noopener noreferrer\">odli\u0161uje<\/a>:<\/p>\n<ul>\n<li>je bin\u00e1rny, nie textov\u00fd, \u010do by malo zn\u00ed\u017ei\u0165 chybovos\u0165 pri anal\u00fdze spr\u00e1v (parsovan\u00ed)<\/li>\n<li>pou\u017e\u00edva kompresiu hlavi\u010diek pre zn\u00ed\u017eenie objemu d\u00e1t a latencie, r\u00e1dovo v milisekund\u00e1ch. SPDY p\u00f4vodne pou\u017e\u00edval GZIP pre ich kompresiu, nakoniec kv\u00f4li bezpe\u010dnosti padla vo\u013eba na vlastn\u00fa implement\u00e1ciu v podobe HPACK<\/li>\n<li>multiplexing, \u010di\u017ee s\u00fa\u010dasn\u00e9 vybavovanie viacer\u00fdch po\u017eiadaviek, dokonca v r\u00f4znom porad\u00ed, minimaliz\u00e1cia v\u00fdpadkov alebo preru\u0161en\u00ed komunik\u00e1cie<\/li>\n<li>server push umo\u017e\u0148uje posiela\u0165 viacero po\u017eiadaviek s\u00fa\u010dasne, napr\u00edklad CSS by malo pr\u00eds\u0165 rovno s HTML a nie a\u017e v \u010fal\u0161ej po\u017eiadavke<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/GIDXISQs67w\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2><b>\u0160ifrovan\u00e9 spojenie nie je podmienkou, ale\u2026<\/b><\/h2>\n<p>Aj ke\u010f samotn\u00e1 \u0161pecifik\u00e1cia nevy\u017eaduje, aby bola komunik\u00e1cia \u0161ifrovan\u00e1 (\u010do bolo d\u00f4vodom mnoh\u00fdch diskusi\u00ed), tak \u201cv\u00fdrobcovia\u201d prehliada\u010dov ju vy\u017eadova\u0165 bud\u00fa cez <a href=\"https:\/\/sk.wikipedia.org\/wiki\/Transport_Layer_Security\">TLS<\/a>. \u00c1no, certifik\u00e1ty nie s\u00fa najlacnej\u0161ie, a pr\u00e1ve preto vznikla iniciat\u00edva <a href=\"https:\/\/www.websupport.sk\/blog\/2016\/02\/lets-encrypt-ssl-certifikat-zadarmo-pre-kazdeho\/\">Let\u2019s Encrypt<\/a>. Ide o aktivitu nieko\u013ek\u00fdch firiem, ktor\u00e9 vyd\u00e1vaj\u00fa SSL certifik\u00e1ty zdarma. Viac o nej a o tom, ako je implementovan\u00e1 v r\u00e1mci na\u0161ich hostingov\u00fdch slu\u017eieb, nabud\u00face.<\/p>\n<p><a href=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2016\/01\/http-vs-http2-multiplexing-serving-all-together.gif\" rel=\"attachment wp-att-7510\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-7510\" src=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2016\/01\/http-vs-http2-multiplexing-serving-all-together.gif\" alt=\"http-vs-http2-multiplexing-serving-all-together\" width=\"700\" height=\"685\" \/><\/a><\/p>\n<h2><b>\u010co m\u00f4\u017eete o\u010dak\u00e1va\u0165 od HTTP\/2<\/b><\/h2>\n<p>Prechod na protokol HTTP\/2 bude pre v\u00e1s takmer nepostrehnute\u013en\u00fd. Prehliada\u010d, ktor\u00fd ho podporuje m\u00e1te u\u017e pravdepodobne nain\u0161talovan\u00fd, no jedna drobnos\u0165 sa predsa len zmen\u00ed &#8211; webov\u00e9 str\u00e1nky by sa v\u00e1m mali na\u010d\u00edta\u0165 r\u00fdchlej\u0161ie a s men\u0161\u00edm objemom prenesen\u00fdch d\u00e1t.<\/p>\n<blockquote class=\"twitter-tweet\" data-lang=\"cs\">\n<p dir=\"ltr\" lang=\"und\">\u010eakujeme, \u017ee sledujete n\u00e1\u0161 nov\u00fd technologick\u00fd kan\u00e1l <a href=\"https:\/\/twitter.com\/websupport_tech\">@websupport_tech<\/a><\/p>\n<p>\u2014 WebSupport Tech (@websupport_tech) <a href=\"https:\/\/twitter.com\/websupport_tech\/status\/727059318235914240\">2. kv\u011btna 2016<\/a><\/p><\/blockquote>\n<p><script async=\"\" src=\"\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>Situ\u00e1cia sa v\u0161ak men\u00ed pre v\u00fdvoj\u00e1rov, ktor\u00ed komunikuj\u00fa cez nov\u00fd protokol. T\u00fdm m\u00f4\u017ee pomoc\u0165 preh\u013ead jeho <a href=\"https:\/\/github.com\/http2\/http2-spec\/wiki\/Implementations\" target=\"_blank\" rel=\"noopener noreferrer\">implement\u00e1cie pre r\u00f4zne jazyky<\/a> a n\u00e1strojov pre jeho <a href=\"https:\/\/blog.cloudflare.com\/tools-for-debugging-testing-and-using-http-2\/\" target=\"_blank\" rel=\"noopener noreferrer\">testovanie, ladenie a pou\u017e\u00edvanie<\/a>.<\/p>\n<p>Zmeny najviac postihn\u00fa hlavne hostingov\u00e9 spolo\u010dnosti a prev\u00e1dzkovate\u013eov vlastn\u00fdch webov\u00fdch serverov. Tam treba updatova\u0165, pr\u00edpadne si po\u010dka\u0165 na stabiln\u00fa implement\u00e1ciu.<\/p>\n<p>My sme protokol SPDY podporovali vy\u0161e roka. V t\u00fdchto d\u0148och sme pre\u0161li na loadbalanceroch na HTTP\/2. Ak prist\u00fapite k va\u0161im str\u00e1nkam cez https:\/\/, pravdepodobne p\u00f4jdete u\u017e cez protokol HTTP\/2.<\/p>\n<h2><b>Bude HTTP\/3?<\/b><\/h2>\n<p>Je jasn\u00e9, \u017ee HTTP\/2 asi nevyrie\u0161i v\u0161etky probl\u00e9my. Na z\u00e1klade toho, ako sa bud\u00fa vyv\u00edja\u0165 \u010fal\u0161ie technol\u00f3gie, bud\u00fa sa postupne objavova\u0165 nov\u00e9 a nov\u00e9 po\u017eiadavky. Kedy teda o\u010dak\u00e1va\u0165 \u010fal\u0161\u00ed upgrade? To je \u0165a\u017eko predv\u00eddate\u013en\u00e9 a ve\u013emi bude z\u00e1le\u017ea\u0165 od toho, ako r\u00fdchlo sa HTTP\/2 udom\u00e1cni a ako bude prebieha\u0165 v\u00e4\u010d\u0161ina komunik\u00e1cie cez tento nov\u00fd protokol.<br \/>\n[mc4wp_form]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Super spr\u00e1va pre v\u0161etk\u00fdch z\u00e1kazn\u00edkov. V\u00e4\u010d\u0161ina str\u00e1nok na zdie\u013eanom hostingu s SSL certifik\u00e1tom je u\u017e nieko\u013eko dn\u00ed dostupn\u00e1 cez nov\u00fd protokol HTTP\/2. Novinka s\u013eubuje v\u00e4\u010d\u0161iu r\u00fdchlos\u0165 a bezpe\u010dnos\u0165. Len m\u00e1lo\u010do dok\u00e1\u017ee vystihn\u00fa\u0165 pojem dynamika tak dokonale ako internet. Virtu\u00e1lne miesto, kde sa trendy menia zo d\u0148a na de\u0148 na takmer v\u0161etk\u00fdch \u00farovniach. Web je stelesnen\u00edm [&hellip;]<\/p>\n","protected":false},"author":105,"featured_media":7502,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,7,11],"tags":[264,354,355,580,699,942,956],"class_list":["post-7500","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novinky","category-technologie","category-zakulisie","tag-evolucia","tag-http","tag-http2","tag-novinka","tag-protokol","tag-web-protokol","tag-websupport"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Nasadili sme r\u00fdchlej\u0161ie a bezpe\u010dnej\u0161ie HTTP\/2 - Websupport.sk Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.sk\/blog\/2016\/01\/nasadili-sme-rychlejsie-a-bezpecnejsie-http2\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nasadili sme r\u00fdchlej\u0161ie a bezpe\u010dnej\u0161ie HTTP\/2 - Websupport.sk Blog\" \/>\n<meta property=\"og:description\" content=\"Super spr\u00e1va pre v\u0161etk\u00fdch z\u00e1kazn\u00edkov. V\u00e4\u010d\u0161ina str\u00e1nok na zdie\u013eanom hostingu s SSL certifik\u00e1tom je u\u017e nieko\u013eko dn\u00ed dostupn\u00e1 cez nov\u00fd protokol HTTP\/2. Novinka s\u013eubuje v\u00e4\u010d\u0161iu r\u00fdchlos\u0165 a bezpe\u010dnos\u0165. Len m\u00e1lo\u010do dok\u00e1\u017ee vystihn\u00fa\u0165 pojem dynamika tak dokonale ako internet. Virtu\u00e1lne miesto, kde sa trendy menia zo d\u0148a na de\u0148 na takmer v\u0161etk\u00fdch \u00farovniach. 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