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HTTP/2
? ?? ?? ??
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??? ??
? ???
? NAVER LABS?? ????? ? ?????? ???
? ? HTTP: The Definitive Guide ???
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?? ???? ?
? HTTP/2?
? ? ????
? ? ???
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? ????
? HTTP/1? ?? ???
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HTTP/1? ? ???
? HTTP/1? ??:
? ?????? ??? ??? ???.
? ??? ??????? ?? ?? ??? ???.
? ???? ???? round trip ??? ???
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HTTP/1? ? ???
? ??? ??? ??? ????? ??? ??
? ?? <=> ??: 8ms
? ?? <=> ??: 35ms
? ?? <=> ??: 200ms
? ?? <=> ??: 8? ~ 48?
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??? HTTP
HTML x 1
PNG x 20
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??? HTTP
? TCP ??? ?? (3-way handshake)
? HTML ?? 1? ???
? TCP ??? ??
? PNG ?? 1? ???
? TCP ??? ??
20? ??
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??? HTTP
? HTML ?? 1? ???
? TCP ??? ??
? PNG ?? 1? ???
? TCP ??? ??
42 RTT
20? ??
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HTTP/1.0+ (KEEP-ALIVE)
? HTML ?? 1? ???
? PNG ?? 1? ??? (20? ??)
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HTTP/1.0+ (KEEP-ALIVE)
? HTML ?? 1? ???
? PNG ?? 1? ??? (20? ??)
22 RTT
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PARALLEL CONNECTIONS
? HTML ?? 1? ???
? TCP ??? 7? ? ?? (3-way handshake)
? PNG ?? 8? ???
? PNG ?? 8? ? ???
? PNG ?? 4? ? ???
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PARALLEL CONNECTIONS
? HTML ?? 1? ???
? TCP ??? 7? ? ?? (3-way handshake)
? PNG ?? 8? ???
? PNG ?? 8? ? ???
? PNG ?? 4? ? ???
6 RTT
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PIPELINING
? HTML ?? 1? ???
? PNG ?? 20? ???
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PIPELINING
? HTML ?? 1? ???
? PNG ?? 20? ???
3 RTT
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PIPELINING
? HTML ?? 1? ???
? PNG ?? 20? ???
??? ????
? ??!
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HTTP/1? ? ??? 2
? ??? ?? ? (?? ??)
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?? ??? ?? ?? ???
? HTTP-NG ???? (1997)
? Roy Fielding? WAKA ??
? S+M(Speedy+Mobility, ???????)
? SPDY (??, 2009)
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HTTP/2
? HTTP ????? SPDY? ???? HTTP/2 ?? ??
(2012? 10?)
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HTTP/2? ? ???
?Header Compression
?Multiplexed Streams
?Server Push
?Stream Priority
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HEADER COMPRESSION
?Huffman Coding
?Header Tables
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HEADER COMPRESSION
??? ?? “date:Mon, 21 Oct 2013
20:13:21 GMT”? ??????? ??
date:Mon, 21 Oct 2013 20:13:21 GMT C S
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HEADER COMPRESSION
??? ?? “date:Mon, 21 Oct 2013
20:13:21 GMT”? ??????? ??
C S
..date..z...T.D. .....f...-..
???? Huffman Coding
??: 34 => 29
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HEADER COMPRESSION
??? ?? “date:Mon, 21 Oct 2013
C 20:13:21 GMT”? ??????? ??
S ..date..z...T.D. .....f...-..
Index Header Name Header Value
1 :authority
... ... ...
33 date
... ... ...
61 www-authenticate
Static Table
Dynamic Table
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HEADER COMPRESSION
??? ?? “date:Mon, 21 Oct 2013
C 20:13:21 GMT”? ??????? ??
S ....z...T.D. .....f...-..
1 :authority
... ... ...
33 date
... ... ...
61 www-authenticate
Static Table
Dynamic Table
?? ??? Static Table
???? ??: 29 => 24
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HEADER COMPRESSION
??? ?? “date:Mon, 21 Oct 2013
C 20:13:21 GMT”? ??????? ??
S ....z...T.D. .....f...-..
1 :authority
... ... ...
33 date
... ... ...
61 www-authenticate
Static Table
62 date
Mon, 21 Oct
2013 20:13:21
GMT
Dynamic Table
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HEADER COMPRESSION
??? ?? “date:Mon, 21 Oct 2013
C 20:13:21 GMT”? ??????? “?” ??
S
1 :authority
... ... ...
33 date
... ... ...
61 www-authenticate
Static Table
62 date
Mon, 21 Oct
2013 20:13:21
GMT
Dynamic Table
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HEADER COMPRESSION
??? ?? “date:Mon, 21 Oct 2013
C 20:13:21 GMT”? ??????? “?” ??
S
1 :authority
... ... ...
33 date
... ... ...
61 www-authenticate
Static Table
62 date
Mon, 21 Oct
2013 20:13:21
GMT
Dynamic Table
.
?? ??? Dynamic Table
???? ??: 24 => 1
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MULTIPLEXED STREAMS
? ????? ??? ??
???? ?? ?? ? ??
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MULTIPLEXED STREAMS
HTML x 1
PNG x 20
Max Connections: 8
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MULTIPLEXED STREAMS
? HTTP/1.1
? TCP ??? 1?? ??
? HTML ?? 1?? ???? ??
? TCP ??? 7?? ? ??
? PNG ?? 8?? ???? ??
? PNG ?? 8?? ? ???? ??
? PNG ?? 4?? ? ???? ??
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MULTIPLEXED STREAMS
? HTTP/1.1
? TCP ??? 1?? ??
? HTML ?? 1?? ???? ??
? TCP ??? 7?? ? ??
? PNG ?? 8?? ???? ??
? PNG ?? 8?? ? ???? ??
? PNG ?? 4?? ? ???? ??
? HTTP/2
? TCP ??? 1?? ??
? HTML ?? 1?? ???? ??
? PNG ?? 20?? ???? ??
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MULTIPLEXED STREAMS
C S
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MULTIPLEXED STREAMS
GET /a.png
GET /b.png
GET /c.png
...
C S
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MULTIPLEXED STREAMS
1: GET /a.png
3: GET /b.png
5: GET /c.png
...
C 1 3 5 7 9 11 13 15 17 19
S
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MULTIPLEXED STREAMS
1: GET /a.png
3: GET /b.png
5: GET /c.png
Frame
...
C 1 3 5 7 9 11 13 15 17 19
S
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MULTIPLEXED STREAMS
C 1 3 5 7 9 11 13 15 17 19
S 1 1 3 5 5 3 5 1 1 3 1: a.png
3: b.png
5: c.png
...
Frame
1: GET /a.png
3: GET /b.png
5: GET /c.png
...
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MULTIPLEXED STREAMS
Stream 1: GET /a.png
Stream 3: GET /b.png
Stream 5: GET /c.png
...
C 1 3 5 7 9 11 13 15 17 19
S
1 1 3 5 5 3 5 1 1 3 Stream 1: a.png
Stream 3: b.png
Stream 5: c.png
...
Frame
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SERVER PUSH
??? ??? ?? ????
??? ???? ??
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SERVER PUSH
HTML x 1
PNG x 2
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SERVER PUSH
? Server Push ???:
? TCP ??? 1?? ??
? HTML ?? 1?? ???? ??
? ?? ?? 2?? ???? ??
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SERVER PUSH
? Server Push ???:
? TCP ??? 1?? ??
? HTML ?? 1?? ???? ??
? ?? ?? 2?? ???? ??
? Server Push ??:
? TCP ??? 1?? ??
? HTML ?? 1?? ???? ??
?? 2?? ?? ??
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SERVER PUSH
C 1
S
1 1 1 1 2 1 2 4 1 4 1: PUSH_PROMISE (2: a.png)
1: PUSH_PROMISE (4: b.png)
1: a.html
2: a.png
4: b.png
1: GET /a.html
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SERVER PUSH
C 1
S
1 1 1 1 2 1 2 4 1 4 1: PUSH_PROMISE (2: a.png)
1: PUSH_PROMISE (4: b.png)
1: a.html
2: a.png
4: b.png
1: GET /a.html
a.png? 2? ????? ???
??? ???? ???
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STREAM PRIORITY
??? ??? ???
??? ? ??
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STREAM PRIORITY
HTML x 1
CSS x 1
PNG x 2
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STREAM PRIORITY
? ??? ?? ???:
? TCP ??? 1?? ??
? HTML ?? 1?? ???? ??
? CSS ?? 1?? ?? ?? 2??
???? ??
? CSS ??? ?? ?? ????
???
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STREAM PRIORITY
? ??? ?? ???:
? TCP ??? 1?? ??
? HTML ?? 1?? ???? ??
? CSS ?? 1?? ?? ?? 2??
???? ??
? CSS ??? ?? ?? ????
???
? ??? ????:
? TCP ??? 1?? ??
? HTML ?? 1?? ???? ??
? CSS ?? 1?? ?? ?? 2??
???? ??. ?? ??? CSS
? ???? ??? ???.
? CSS ??? ?? ?? ????
???
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STREAM PRIORITY
C 7 5 3
S
3 3 3 3 7 5 5 7 7 5 3: a.css
5: 1.png
7: 2.png
3: GET /a.css
5: GET /1.png (3? ??)
7: GET /2.png (3? ??)
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STREAM PRIORITY
C 7 5 3
S
3 3 3 3 7 5 5 7 7 5 3: a.css
5: 1.png
7: 2.png
3: GET /a.css
5: GET /1.png (3? ??)
7: GET /2.png (3? ??)
??? ??? ??????
?? ??? ?? ??
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HTTP/1?? ??? ?
? HTTP ??? ??
? HTTP ??? ????
? Connection ?? ???
? chunked ??? ?? ??
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??? ?? ?
? “HTTP's existing semantics remain unchanged.”
? RFC 7231, 7232, 7233, 7234, 7235 ??? ???
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SPDY? ?? ?
?? ??
SPDY
HTTP/2
zlib
HPACK
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SPDY? ?? ?
?? ??
SPDY
HTTP/2
zlib
HPACK
CRIME
???
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???? ??
? IE 11 on Windows 8
? Firefox 34
? Chrome --enable-spdy4
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?? HTTP/2 ????
?Working Group Last Call (??? ??)
? 2015? 2? RFC? ??? “??”
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HTTP/2? ?????
? HTTP/2 ?? HPACK ??? ??,
? ietf-http-wg@w3.org ? ??? ????.
? ?? ?? ?? ?? https://github.com/http2/http2-spec
? PullRequest? ??? ????.
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? ?? ?? ??: HTTP/2

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