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HTTP/2 Server Push Considered Harmful
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Moto Ishizawa
April 14, 2015
Technology
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HTTP/2 Server Push Considered Harmful
Moto Ishizawa
April 14, 2015
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Transcript
HTTP/2 Server Push ʹؔ͢ΔҰߟ
Moto Ishizawa (@summerwind)
Ծઆ HTTP/2 ͷ Server Push Λͬͯɺ Above the fold ͷϦιʔεΛϓογϡͨ͠Β
ϨϯμϦϯά͕͘ͳΔͷͰʁ
ݕূϖʔδ
ςετڥ αʔόʔ • CentOS 7.0 • H2O (1.1.2-alpha1) • Nginx
(1.7.11) ΫϥΠΞϯτ • Chrome Canary (44.0.2364.0) ωοτϫʔΫ • Uplink delay: 100ms • Downlink delay: 100ms
HTTP/2 ը૾ͷಡΈࠐΈ͔֬ʹ͘ͳ͍ͬͯΔ Above the fold ͷϦιʔεΛαʔόʔϓογϡ͢Δ HTTP/2 (Pushed above the
fold)
HTTP/2 JS ͕ϨϯμϦϯάΛϒϩοΫ͍ͯ͠Δ Above the fold ͷϦιʔεΛαʔόʔϓογϡ͢Δ HTTP/2 (Pushed above
the fold)
HTTP/2 DOM ߏஙλΠϛϯά͕վળ JavaScript Λαʔόʔϓογϡ͢Δ HTTP/2 (Pushed JavaScript)
HTTP/2 CSS ͕ϨϯμϦϯάΛϒϩοΫ͍ͯ͠Δ JavaScript Λαʔόʔϓογϡ͢Δ HTTP/2 (Pushed JavaScript)
HTTP/2 (Pushed CSS & JavaScript) DOM ߏஙλΠϛϯά͕͞Βʹվળ CSS ͱ JavaScript
Λαʔόʔϓογϡ͢Δ HTTP/2
HTTP/2 (Pushed CSS & JavaScript & Above the fold) ͋Εɺվળ͞Ε͍ͯͳ͍…
શ෦αʔόʔϓογϡ͢Δ HTTP/2
HTTP/2 (Pushed CSS & JavaScript & Above the fold) ͦͦ
Chrome ͕ࢦఆ͢Δ Priority ͕ߟྀ͞Ε͍ͯͳ͍…? શ෦αʔόʔϓογϡ͢Δ HTTP/2
HTTP/1.1 HTTP/2 vs HTTP/1.1 HTTP/2 HTTP/1.1 ͷํ͕ DOM ߏஙλΠϛϯά͕͍
nghttpx H2O vs nghttpx H2O ϓογϡ͠ͳͯ͘ DOM ͷߏஙλΠϛϯά͕͍
nghttpx H2O vs nghttpx H2O CSSɺJavaScriptɺը૾ͷॱ൪ʹసૹ͞Ε͍ͯΔ
nghttpx nghttpx Ͱ Above the fold ͷϦιʔεΛαʔόʔϓογϡ͢Δ Ұ൪࠷ޙʹαʔόʔϓογϡͷ͕సૹ͞Ε͍ͯΔ nghttpx (Pushed
Above the fold)
·ͱΊ • Above the fold ͷϦιʔεΛϓογϡͯ͘͠ͳΒͳ͍ • ϒϥβ૬खͷ߹ϨϯμϦϯάͷ͜ͱΛߟྀͯ͋͛͠Δඞཁ͕͋Δ • HTTP/2
Ͱαʔόʔͷ࣮࣍ୈͰɺϨϯμϦϯάύϑΥʔϚϯεมΘͬͯ͘Δ • nghttp2 ͷεέδϡʔϥʔϒϥβͱ૬ੑ͕ྑ͍ • H2O ͷεέδϡʔϥʔվળͷ༨͕͋Δ͔ • ͳΜͰαʔόʔϓογϡ͢Ε͘ͳΔɺͱ͍͏ͷͰͳ͍ • ϞόΠϧΞϓϦͱ Web API ͷΈ߹Θͤͷ߹ͬͱΧδϡΞϧʹ͑ͦ͏
Thank you :-)