{"id":54747,"date":"2020-01-03T00:00:00","date_gmt":"2020-01-02T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/sravnenie-proizvoditelnosti-http-1-1-http-2-i-http-2-server-push"},"modified":"2020-02-18T14:02:48","modified_gmt":"2020-02-18T11:02:48","slug":"sravnenie-proizvoditelnosti-http-1-1-http-2-i-http-2-server-push","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/sravnenie-proizvoditelnosti-http-1-1-http-2-i-http-2-server-push","title":{"rendered":"Confronto delle prestazioni tra HTTP\/1.1, HTTP\/2 e HTTP\/2 + Server Push","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/evertpot.com\/h2-parallelism\/\">Pubblicati<\/a><\/noindex> risultati dello studio sulle prestazioni dei diversi metodi di estrazione di una raccolta di risorse, utilizzando i protocolli per l'accesso al server HTTP\/1.1, HTTP\/2 e HTTP\/2 + Server Push. Nella ricerca \u00e8 stata anche valutata l'influenza delle prestazioni nella memorizzazione dei dati richiesti nella cache del browser e nella manipolazione delle risorse a livello della logica operativa dell'applicazione (riduzione delle risorse in un unico blocco JSON).<\/p>\n<p>Il test delle prestazioni eseguendo 25 richieste ha mostrato risultati complessivamente prevedibili \u2014 un notevole ritardo nella richiesta tramite HTTP\/1.1 con cache vuota e il predominio del rilascio delle risorse in un singolo blocco (test contrassegnati come \u00abcompound\u00bb). Le prestazioni di Firefox e Chrome erano all'incirca allo stesso livello, ma la presenza di dati nella cache non ha portato al previsto aumento dell'efficienza.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/pics_base\/0_1578035907.png\"><img decoding=\"async\" alt=\"Confronto delle prestazioni tra HTTP\/1.1, HTTP\/2 e HTTP\/2 + Server Push\" src=\"\/wp-content\/uploads\/2020\/01\/65220a8e8b90cf034469b7cfc302a4d9.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Tuttavia, nel test con 500 richieste \u00e8 emerso un notevole ritardo di Chrome rispetto a Firefox nella trasmissione di un gran numero di richieste, e un ritardo di Firefox rispetto a Chrome nell'uso del meccanismo Server Push e nella situazione di utilizzo di HTTP\/2 con la maggior parte dei dati nella cache del browser. Chrome ha mostrato un funzionamento pi\u00f9 efficiente con la cache, mentre Firefox una gestione pi\u00f9 efficace delle richieste esterne.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/pics_base\/0_1578035953.png\"><img decoding=\"async\" alt=\"Confronto delle prestazioni tra HTTP\/1.1, HTTP\/2 e HTTP\/2 + Server Push\" src=\"\/wp-content\/uploads\/2020\/01\/1ca56f910b6f15900504b9ed40fb567e.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/pics_base\/0_1578036180.png\"><img decoding=\"async\" alt=\"Confronto delle prestazioni tra HTTP\/1.1, HTTP\/2 e HTTP\/2 + Server Push\" src=\"\/wp-content\/uploads\/2020\/01\/1b34283595dbdc23d3876541c3b44142.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Al termine dei test, si \u00e8 giunti alla conclusione che HTTP\/2 consente di gestire abbastanza efficacemente richieste separate di una grande raccolta di risorse. Le differenze di prestazioni tra schemi semplici di erogazione separata delle risorse e metodi in cui le risorse vengono aggregate in un unico blocco non sono cos\u00ec significative da giustificare un notevole complicamento della logica di elaborazione sul lato dell'applicazione e <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-los-angeles\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3593\">server<\/a>. L'aggregazione ha senso solo in situazioni in cui le prestazioni hanno la massima priorit\u00e0. Quando \u00e8 pi\u00f9 importante semplificare la logica e avere un'API semplice, ha senso utilizzare l'elaborazione separata delle risorse.<\/p>\n<p>Un'altra conclusione \u00e8 che la cache del browser, nell'uso di HTTP\/2, non ha un impatto significativo sulle prestazioni nell'elaborazione delle richieste (l'esecuzione completa di 501 richieste \u00e8 risultata pi\u00f9 lenta rispetto all'esecuzione di 51 richieste con un riempimento della cache del 90%, rispettivamente di 1,2 volte in Firefox e di 2,3 volte in Chrome). L'uso di Server Push non ha mostrato vantaggi significativi in Firefox, ma si \u00e8 rivelato efficace nel caricamento di un gran numero di risorse in Chrome. Gli autori dello studio hanno anche notato che l'ottimizzazione della parte server ha un impatto pi\u00f9 sostanziale sulle prestazioni rispetto all'ottimizzazione del codice client eseguito nel browser.<\/p>\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=52129\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0438\u0437\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0438\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438\u044f \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u0438 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u0434\u043b\u044f \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u044f \u043a \u0441\u0435\u0440\u0432\u0435\u0440\u0443 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u044b HTTP\/1.1, HTTP\/2 \u0438 HTTP\/2 + Server Push. \u0412 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0438 \u0442\u0430\u043a\u0436\u0435 \u043e\u0446\u0435\u043d\u0435\u043d\u043e \u0432\u043b\u0438\u044f\u043d\u0438\u0435 \u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u043d\u0430\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0435 \u0437\u0430\u043f\u0440\u0430\u0448\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u043a \u043a\u044d\u0448\u0435 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430 \u0438 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0440\u0435\u0441\u0443\u0440\u0441\u0430\u043c\u0438 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u043b\u043e\u0433\u0438\u043a\u0438 \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f (\u0441\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u0432 \u0435\u0434\u0438\u043d\u044b\u0439 JSON-\u0431\u043b\u043e\u043a). \u0422\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f 25 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u043e \u0432 [&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-54747","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0438\u0437\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0438\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438\u044f 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