HTTP/2 最速実装 v3

)551࠷଎࣮૷W IUUQESBGUରԠ൛ !TZV@DSFBN

໨࣍ w )551ͷ؆୯ͳઆ໌ w )551Yͷ͓͞Β͍ w )551ͷಛ௃ w )551࠷଎࣮૷ͷղઆ w
࠷௿ݶߦ͏΂͖࣮૷ʹ͍ͭͯ w ಈ࡞֬ೝํ๏ w ֤छࢿྉ

)551ͷ ؆୯ͳઆ໌

)551YͷϦΫΤετ w ݪଇDPOOFDUJPOSFRVFTU w Ұൠతͳϒϥ΢β͸ಉ࣌ʹίωΫγϣϯ͔͠։͔ͳ͍

)551ͷ1JQFMJOJOH w ίωΫγϣϯͰෳ਺ϦΫΤετΛ౤͛ΒΕΔ w ͨͩ͠ॱংΛकΒͳ͚Ε͹ͳΒͳ͍ w ͜ͷ੍໿ͷͨΊϨεϙϯε͕ϒϩοΫ͢ΔةݥੑΞϦ )FBEPG-JOF#MPDLJOH server client
1 1.,GET,/hoge.gif 2.,GET,/fuga.html 3.,GET,/piyo.css

)551Yͷϔομ w ςΩετͰϔομΛ΍ΓऔΓ w ϔομͱϘσΟͷ۠੾Γ͸ۭվߦ w 6TFS"HBOUͳͲ΄ͱΜͲมΘΒͳ͍ͷʹԿ౓΋ૹ৴͢Δඞཁ͕͋Γɺ৑௕ (&5)551 )PTUMPDBMIPTU "DDFQU
$3 -' )5510, 4FSWFSOHJOY %BUF'SJ 4FQ(.5 $POUFOU5ZQFUFYUIUNM $POUFOU-FOHUI -BTU.PEJpFE'SJ 4FQ(.5 $POOFDUJPOLFFQBMJWF &5BHBGF "DDFQU3BOHFTCZUFT $3 -' ϦΫΤετϔομͷྫ Ϩεϙϯεϔομͷྫ

)551ͷಛ௃ w ࿦ཧతͳίωΫγϣϯ ετϦʔϜ ʹΑΔฒྻ௨৴ w ݪଇతʹίωΫγϣϯ͸ຊ͚ͩுΔ w ϝοηʔδΛόΠφϦϑϨʔϜͰදݱ w
ϔομΛಠࣗͷܗࣜͰѹॖ )1"$, w αʔό͔Βͷࣗൃతͳ௨৴ αʔόϓογϡ w ετϦʔϜͷ༏ઌ౓෇͚

ετϦʔϜ w ͭͷίωΫγϣϯ͚ͩுΓɺͦͷ্ͰετϦʔϜΛ։͘ w )551௨৴͸ετϦʔϜ্ͰߦΘΕΔ w ετϦʔϜͷॲཧ͸ϒϩοΫ͠߹Θͳ͍ w ετϦʔϜʹ͸Ұҙͳ*%͕ৼΒΕΔ w
ΫϥΠΞϯτ͔Β։͘৔߹ح਺ɺαʔό͔Β։͘৔߹ۮ਺Λ࢖༻ w 4USFBN*%͸؅ཧ༻ʹ࢖༻͞ΕΔ server client TCP HTTP/2 HTTP/20 HTTP/20

όΠφϦϑϨʔϜ w ϝοηʔδΛόΠφϦͷʮϑϨʔϜʯͰදݱ w ϑϨʔϜʹ͸ϔομ͕෇༩͞ΕΔ w ϑϨʔϜ௕ɺλΠϓɺϑϥάɺετϦʔϜ*% w ϑϨʔϜͷϑΥʔϚοτ͸Լهͷ௨Γ

ϑϨʔϜλΠϓ w ϑϨʔϜ͸༻్ʹԠͯ͡Լهͷ༷ʹ෼ྨ͞ΕΔ w %"5" ϘσΟΛදݱ w )&"%&34 ϔομΛදݱ
w 13*03*5: ετϦʔϜͷ༏ઌ౓ઃఆ w 345@453&". ετϦʔϜΛҟৗऴྃ w 4&55*/(4 ίωΫγϣϯͷઃఆ w 164)@130.*4& αʔόϓογϡͷ௨஌ w 1*/( ίωΫγϣϯͷࢮ׆֬ೝ w (0"8": ίωΫγϣϯͷऴྃ௨஌ w 8*/%08@61%"5& ϑϩʔ੍ޚ w $0/5*/6"5*0/ )&"%&34ʹೲ·Βͳ͍෼ͷϔομͷૹ৴

ϔομѹॖ w )1"$,ͱ͍͏ܗࣜͰѹॖ͞ΕΔ w IUUQUPPMTJFUGPSHIUNMESBGUJFUGIUUQCJTIFBEFS DPNQSFTTJPO w ѹॖํ๏ w ϔομͷ໊લ΍஋ΛϋϑϚϯූ߸Խ
w Α͘࢖ΘΕΔϔομͷηοτΛJOEFYͰࢦఆ w ҎલૹͬͨϔομΛJOEFYͰࢦఆ

)551࠷଎࣮૷ͷ ղઆ

)551࠷଎࣮૷ͱ͸ w )551͸Yͱࠩ෼͕ଟ͍ w ਅ໘໨ʹ࣮૷͍ͯ͠Δͱ͕͔͔࣌ؒΔʜ w ࠷௿ݶϦΫΤετ͕ॲཧ͞ΕΔͱ͜Ζ·ͰΛ࣮૷͠Α͏ʂ w IUUQTHJUIVCDPNIUUQKQIUUQKQHJUIVCJPXJLJ)551 &$&'&"&'
&"&# w ΫϥΠΞϯτ͔Β࣮૷ͨ͠ํָ͕ w ຊࢿྉ΋ΫϥΠΞϯτͷ࣮૷Λ૝ఆͯ͠࡞੒͍ͯ͠·͢

࠷଎࣮૷Ͱ΍Δ΂͖ൣғ w όΠφϦϑϨʔϜॲཧ w ಛఆछྨͷϑϨʔϜ͚ͩ΍Γ·͢ w %"5" )&"%&34 4&55*/(4 (0"8":
w ετϦʔϜ؅ཧ w αϘΓ·͢ɻTUSFBNJE͚ͩΛ࢖༻ w ঢ়ଶ΋؅ཧ͠ͳ͍ɻ͋ΔॱংͰϑϨʔϜ͕དྷΔ͜ͱΛ૝ఆɻ w ϔομѹॖ w αϘΓ·͢ɻFODPEF͚ͩ͸)1"$,ͷϑΥʔϚοτʹͳΔ΂͘߹Θͤ·͢ɻ

࠷଎࣮૷ʹΑΔ ΫϥΠΞϯταʔόͷ΍ΓऔΓ server client 0.,$"& % 1.,Connec0on,Preface( 24,octets,), 2.,
,SETTINGS,frame, 3.,SETTINGS,frame ACK 5.,HEADERS,frame ! 6.,HEADERS,frame,(#%) 7.,DATA,frame,(#%) 8.,GOAWAY,frame, 4.,ACK

ϓϩτίϧ ωΰγΤʔγϣϯ w )551Λ࢖͏ࣄΛDMJFOUTFSWFSؒͰͲ͏ܾఆ͢Δ͔ʁ w ਅ໘໨ʹ΍Δ৔߹ w IUUQTͳΒ5-4/1/PS5-4"-1/ w IUUQͳΒ6QHSBEF
"MU4WD w ࠷଎࣮૷Ͱ͸%JSFDU ωΰγΤʔγϣϯ͠ͳ͍ Ͱߦ͖·͢ w ૬ख͕)551͠Ό΂ΕΔ૝ఆͰ௨৴

$POOFDUJPO1SFGBDF w )551ηογϣϯ։࢝࣌ʹΦΫςοτͷจࣈྻΛૹ৴ w 13* )551aSaOaSaO4.aSaOaSaOz w )551YͰ͸l13*ϝιου͕དྷͨzͱղऍ͞ΕΔ w )551͠Ό΂Εͳ͍αʔόʹૣظʹηογϣϯΛ੾ͬͯ໯͑Δ
! w ࢀߟIUUQTVNNFSXJOEKQEPDTESBGUJFUGIUUQCJTIUUQ TFDUJPO

4&55*/(4GSBNF w ίωΫγϣϯશମʹؔΘΔઃఆΛ΍ΓऔΓ͢Δ w αʔόϓογϡڐՄɺಉ࣌ετϦʔϜͷ࠷େ਺ͳͲ w ϖΠϩʔυ͸ۭ ϑϨʔϜͷMFOHUI Ͱ΋Α͍
w ϖΠϩʔυͷϑΥʔϚοτ͸Լهͷ௨Γ ! w ࢀߟIUUQTVNNFSXJOEKQEPDTESBGUJFUGIUUQCJTIUUQTFDUJPO

4&55*/(4GSBNF "$, w 4&55*/(4डऔଆ͸"$,Λฦ͢ඞཁ͕͋Δ w ϑϨʔϜϔομͷϑϥάͰYΛཱͯΔ w ϖΠϩʔυ͸ۭʹ͢Δ !
w ࢀߟIUUQTVNNFSXJOEKQEPDTESBGUJFUG IUUQCJTIUUQTFDUJPO

)&"%&34 ϦΫΤετ w ϦΫΤετϔομΛૹ৴ w )FBEFS#MPDL'SBHNFOUҎ֎೚ҙ w )FBEFS#MPDL'SBHNFOU͸)1"$,ͷܗࣜʹΤϯίʔυ͢Δ ޙड़
! w ࢀߟIUUQTVNNFSXJOEKQEPDTESBGUJFUGIUUQCJTIUUQTFDUJPO

)1"$, w )551ͷϔομѹॖܗࣜ w IUUQUPPMTJFUGPSHIUNMESBGUJFUGIUUQCJTIFBEFS DPNQSFTTJPO w ࠷଎࣮૷Ͱ͸-JUFSBM)FBEFS'JFMEXJUIPVU*OEFYJOHΛ࢖༻ w ϋϑϚϯූ߸ԽɺΠϯσΫγϯάΛߦΘͳ͍
w ඞਢͷϔομ͕͋ΔͷͰͦΕ͸ؚ·ͤΔ͜ͱ w ϦΫΤετͰ͸NFUIPE TDIFNF BVUIPSJUZ QBUI w ϨεϙϯεͰ͸TUBUVT

)1"$,ΤϯίʔυͷΠϝʔδ w ϑΥʔϚοτ͸ࠨԼͷਤͷ௨Γ w )͸ϋϑϚϯූ߸Խϑϥάɻʹ͓ͯ͘͠ w -FOHUIͷ ͸೚ҙ௕ɻࠓճ͸Ϗοτʹೲ·Δ૝ఆͰ࣮૷ɻ w
ਅ໘໨ʹ࣮૷͢ΔͳΒ*OUFHFS3FQSFTFOUBUJPOΛࢀর w 4USJOHͷ෦෼͸"4$**ίʔυΛೖΕΔ w /BNF͕lNFUIPEzɺ7BMVF͕l(&5zͷ৔߹ɺӈͷΠϝʔδͷΑ͏ʹ͢Δ -JUFSBM)FBEFS'JFMEXJUIPVU*OEFYJOHϑΥʔϚοτ cccccc ccc clNFUIPEzc ccc cl(&5zc ΤϯίʔυޙͷΠϝʔδ 4USJOH෦෼͸࣮ࡍʹ͸จࣈྻ෼ͷPDUFUΛ࢖༻

)&"%&34 Ϩεϙϯε w ϨεϙϯεϔομΛड৴ w ϖΠϩʔυ͸)1"$,ͷΤϯίʔυͱٯͷ࣮૷Λॻ͚͹0, w ͨͩ͠૬ख͕ϋϑϚϯූ߸ɺΠϯσΫγϯάͯ͘͠ΔՄೳੑ͋Γ w ࠷଎Ͱ͸࣮૷ΛαϘΓ·͠ΐ͏X
w ϑϨʔϜͷ-FOHUI෼͚ͩόοϑΝΛಡΈඈ͹ͦ͏ɻɻɻ w ༨༟͕͋Ε͹࣮૷ͯ͠Έ͍ͯͩ͘͞

%"5" Ϩεϙϯε w ϨεϙϯεϘσΟΛड৴ w ϖΠϩʔυ͸%BUB ͷ෦෼͚ͩΛ૝ఆ w όοϑΝΛͻͨ͢ΒಡΈग़͚ͩ͢Ͱ0, w
ϨεϙϯεϘσΟ͕ςΩετͳΒɺͦͷ··ग़ྗͯ͠ΈΑ͏ʂ

(0"8": w ηογϣϯऴྃΛ௨஌͢Δ w -BTU4USFBN*%ɺ&SSPS$PEF w "EEJUJJPOBM%FCVH%BUB͸ෆཁ ! w ࢀߟIUUQTVNNFSXJOEKQEPDTESBGUJFUGIUUQCJTIUUQ
TFDUJPO

͜͜·ͰͰ͖Ε͹࠷଎࣮૷ ׬ྃͰ͢ ͓ർΕ͞·Ͱͨ͠

ಈ࡞֬ೝํ๏ w ΫϥΠΞϯτΛ࣮૷͢Δ৔߹ w 1VCMJD5FTU4FSWFSΛ࢖͏ w IUUQTOHIUUQPSH w OHIUUQEΛ࢖͏ %PDLFSJNBHF༻ҙ͠·ͨ͠
w ࠷଎࣮૷αʔόΛ࢖͏ w αʔόΛ࣮૷͢Δ৔߹ w OHIUUQ ΫϥΠΞϯτ࣮૷ Λ࢖͏ %PDLFSJNBHF༻ҙ͠·ͨ͠ w ࠷଎࣮૷ΫϥΠΞϯτΛ࢖͏

OHIUUQ༻%PDLFSJNBHF w OHIUUQ࢖͑Δ%PDLFSJNBHF༻ҙ͠·ͨ͠ w ࢖༻ํ๏ w EPDLFSQVMMTZVDSFBNOHIUUQI w EPDLFSSVOJQUTZVDSFBN OHIUUQICJOCBTI
w ίϯςφ಺ OHIUUQEWOPUMT

࠷଎࣮૷ྫ w ࠷଎࣮૷ͯ͠Έ·ͨ͠ɻࢀߟʹ͍ͯͩ͘͠͞ɻ w IUUQTHJUIVCDPNTZVDSFBN .JOJNVN)551

ࢀߟࢿྉ w IUUQESBGU೔ຊޠ༁ w IUUQTVNNFSXJOEKQEPDTESBGUJFUGIUUQCJTIUUQ w )1"$,ESBGU w IUUQUPPMTJFUGPSHIUNMESBGUJFUGIUUQCJTIFBEFS DPNQSFTTJPO
w )551ϋοΧιϯୈҰճɺୈೋճͷࢿྉ w IUUQXXXTMJEFTIBSFOFU,BPSV.BFEBIUUQTJNQMF w IUUQXXXTMJEFTIBSFOFU:PTIJIJSP*XBOBHBIUUQ

ൃల՝୊ w ࠷଎࣮૷͕ऴΘͬͨΒԼه΋௅ઓͯ͠ΈͯԼ͍͞ w )1"$,FODPEFSEFDPEFSϑϧ࣮૷ w ετϦʔϜͷঢ়ଶ؅ཧ w ଞλΠϓͷϑϨʔϜॲཧ࣮૷

HTTP/2 最速実装 v3

HTTP/2 最速実装 v3

Ryo Okubo

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)551࠷଎࣮૷W IUUQESBGUରԠ൛ !TZV@DSFBN

໨࣍ w )551ͷ؆୯ͳઆ໌ w )551Yͷ͓͞Β͍ w )551ͷಛ௃ w )551࠷଎࣮૷ͷղઆ w

)551ͷ ؆୯ͳઆ໌

)551YͷϦΫΤετ w ݪଇDPOOFDUJPOSFRVFTU w Ұൠతͳϒϥ΢β͸ಉ࣌ʹίωΫγϣϯ͔͠։͔ͳ͍

)551ͷ1JQFMJOJOH w ίωΫγϣϯͰෳ਺ϦΫΤετΛ౤͛ΒΕΔ w ͨͩ͠ॱংΛकΒͳ͚Ε͹ͳΒͳ͍ w ͜ͷ੍໿ͷͨΊϨεϙϯε͕ϒϩοΫ͢ΔةݥੑΞϦ )FBEPG-JOF#MPDLJOH server client

)551Yͷϔομ w ςΩετͰϔομΛ΍ΓऔΓ w ϔομͱϘσΟͷ۠੾Γ͸ۭվߦ w 6TFS"HBOUͳͲ΄ͱΜͲมΘΒͳ͍ͷʹԿ౓΋ૹ৴͢Δඞཁ͕͋Γɺ৑௕ (&5)551 )PTUMPDBMIPTU "DDFQU

)551ͷಛ௃ w ࿦ཧతͳίωΫγϣϯ ετϦʔϜ ʹΑΔฒྻ௨৴ w ݪଇతʹίωΫγϣϯ͸ຊ͚ͩுΔ w ϝοηʔδΛόΠφϦϑϨʔϜͰදݱ w

ετϦʔϜ w ͭͷίωΫγϣϯ͚ͩுΓɺͦͷ্ͰετϦʔϜΛ։͘ w )551௨৴͸ετϦʔϜ্ͰߦΘΕΔ w ετϦʔϜͷॲཧ͸ϒϩοΫ͠߹Θͳ͍ w ετϦʔϜʹ͸Ұҙͳ*%͕ৼΒΕΔ w

όΠφϦϑϨʔϜ w ϝοηʔδΛόΠφϦͷʮϑϨʔϜʯͰදݱ w ϑϨʔϜʹ͸ϔομ͕෇༩͞ΕΔ w ϑϨʔϜ௕ɺλΠϓɺϑϥάɺετϦʔϜ*% w ϑϨʔϜͷϑΥʔϚοτ͸Լهͷ௨Γ

ϑϨʔϜλΠϓ w ϑϨʔϜ͸༻్ʹԠͯ͡Լهͷ༷ʹ෼ྨ͞ΕΔ w %"5" ϘσΟΛදݱ w )&"%&34 ϔομΛදݱ

ϔομѹॖ w )1"$,ͱ͍͏ܗࣜͰѹॖ͞ΕΔ w IUUQUPPMTJFUGPSHIUNMESBGUJFUGIUUQCJTIFBEFS DPNQSFTTJPO w ѹॖํ๏ w ϔομͷ໊લ΍஋ΛϋϑϚϯූ߸Խ

)551࠷଎࣮૷ͷ ղઆ

)551࠷଎࣮૷ͱ͸ w )551͸Yͱࠩ෼͕ଟ͍ w ਅ໘໨ʹ࣮૷͍ͯ͠Δͱ͕͔͔࣌ؒΔʜ w ࠷௿ݶϦΫΤετ͕ॲཧ͞ΕΔͱ͜Ζ·ͰΛ࣮૷͠Α͏ʂ w IUUQTHJUIVCDPNIUUQKQIUUQKQHJUIVCJPXJLJ)551 &$&'&"&'

࠷଎࣮૷Ͱ΍Δ΂͖ൣғ w όΠφϦϑϨʔϜॲཧ w ಛఆछྨͷϑϨʔϜ͚ͩ΍Γ·͢ w %"5" )&"%&34 4&55*/(4 (0"8":

࠷଎࣮૷ʹΑΔ ΫϥΠΞϯταʔόͷ΍ΓऔΓ server client 0.,$"& % 1.,Connec0on,Preface( 24,octets,), 2.,

ϓϩτίϧ ωΰγΤʔγϣϯ w )551Λ࢖͏ࣄΛDMJFOUTFSWFSؒͰͲ͏ܾఆ͢Δ͔ʁ w ਅ໘໨ʹ΍Δ৔߹ w IUUQTͳΒ5-4/1/PS5-4"-1/ w IUUQͳΒ6QHSBEF

$POOFDUJPO1SFGBDF w )551ηογϣϯ։࢝࣌ʹΦΫςοτͷจࣈྻΛૹ৴ w 13* )551aSaOaSaO4.aSaOaSaOz w )551YͰ͸l13*ϝιου͕དྷͨzͱղऍ͞ΕΔ w )551͠Ό΂Εͳ͍αʔόʹૣظʹηογϣϯΛ੾ͬͯ໯͑Δ

4&55*/(4GSBNF w ίωΫγϣϯશମʹؔΘΔઃఆΛ΍ΓऔΓ͢Δ w αʔόϓογϡڐՄɺಉ࣌ετϦʔϜͷ࠷େ਺ͳͲ w ϖΠϩʔυ͸ۭ ϑϨʔϜͷMFOHUI Ͱ΋Α͍

4&55/(4GSBNF "$, w 4&55/(4डऔଆ͸"$,Λฦ͢ඞཁ͕͋Δ w ϑϨʔϜϔομͷϑϥάͰYΛཱͯΔ w ϖΠϩʔυ͸ۭʹ͢Δ !

)&"%&34 ϦΫΤετ w ϦΫΤετϔομΛૹ৴ w )FBEFS#MPDL'SBHNFOUҎ֎೚ҙ w )FBEFS#MPDL'SBHNFOU͸)1"$,ͷܗࣜʹΤϯίʔυ͢Δ ޙड़

)1"$, w )551ͷϔομѹॖܗࣜ w IUUQUPPMTJFUGPSHIUNMESBGUJFUGIUUQCJTIFBEFS DPNQSFTTJPO w ࠷଎࣮૷Ͱ͸-JUFSBM)FBEFS'JFMEXJUIPVU*OEFYJOHΛ࢖༻ w ϋϑϚϯූ߸ԽɺΠϯσΫγϯάΛߦΘͳ͍

)1"$,ΤϯίʔυͷΠϝʔδ w ϑΥʔϚοτ͸ࠨԼͷਤͷ௨Γ w )͸ϋϑϚϯූ߸Խϑϥάɻʹ͓ͯ͘͠ w -FOHUIͷ ͸೚ҙ௕ɻࠓճ͸Ϗοτʹೲ·Δ૝ఆͰ࣮૷ɻ w

)&"%&34 Ϩεϙϯε w ϨεϙϯεϔομΛड৴ w ϖΠϩʔυ͸)1"$,ͷΤϯίʔυͱٯͷ࣮૷Λॻ͚͹0, w ͨͩ͠૬ख͕ϋϑϚϯූ߸ɺΠϯσΫγϯάͯ͘͠ΔՄೳੑ͋Γ w ࠷଎Ͱ͸࣮૷ΛαϘΓ·͠ΐ͏X

%"5" Ϩεϙϯε w ϨεϙϯεϘσΟΛड৴ w ϖΠϩʔυ͸%BUB ͷ෦෼͚ͩΛ૝ఆ w όοϑΝΛͻͨ͢ΒಡΈग़͚ͩ͢Ͱ0, w

(0"8": w ηογϣϯऴྃΛ௨஌͢Δ w -BTU4USFBN*%ɺ&SSPS$PEF w "EEJUJJPOBM%FCVH%BUB͸ෆཁ ! w ࢀߟIUUQTVNNFSXJOEKQEPDTESBGUJFUGIUUQCJTIUUQ

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