spdy быстрее на 146% (Валентин Бартенев)
TRANSCRIPT
Valentin V. BartenevNGINX, Inc.
SPDY: 146% faster
2 / 16What the fu in the world
is going on SPDY?
● Binary protocol● Developed by Google● Transport layer for HTTP● Works over TLS
– proxy transparency
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A long time ago in a galaxy far, far away....
● Simple sites, light pages– no CSS, no JavaScript
– a few graphics
● Slow clients, low capacity last miles
p.s. http://wayback.archive.org/
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The world is changing● Broadband internet connections● Fat pages● Browser arms race● Hard-to-please customers
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What Is to Be Done?● Metrics: RTT, TTFB● Browser caching● Keepalive, pipelining● JS/CSS catenation, sprites, inlining,
data URI scheme● Async loading, AJAX● Domain sharding● Proxying, CDN
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Pipelining
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SPDY features
● Multiplexing● HTTP headers compression● Flow control● Server push
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Multiplexing
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HTTP headers compression
● Zlib● Dictionary● CRIME
- zero compression level
- zlib hack
- new algorithm in SPDY/4
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Lulz
● Partial alignment● 24 bits for all headers, but 32 bits for
every header name and value● Blowing hot & cold with priority ● Mistakes in comp. dictionary● Chrome flow control fail
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To be or not to be?
● HTTPS ready● Lot of external resources per page● Big RTT● Stats from WordPress:
– faster than HTTPS,
– but slower than plain HTTP
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SPDY in NGINX
● Sponsored and tested by Automattic– WordPress, Gravatar
– Wordpress.com: 70 000 rps, 15+ Gbit/sec
● Timeline– March 2012: the work has started
– 15 June: first public release
– 18 August: last stable version
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May October0
500
1000
1500
2000
2500
3000
3500
4000
SP
DY
do
ma
ins
89%
9%
SPDY Server Survey Nginx
Apache
Other
Results
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How-To● OpenSSL 1.0.1+ (NPN support required)● http://nginx.org/patches/spdy/ (temporary)
server { listen 433 ssl spdy; ssl_certificate path/to/server.crt; ssl_certificate_key path/to/private.key; #spdy_headers_comp 1;}
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Detect SPDY in browser● Chrome/Chromium:
– window.chrome.loadTimes().wasFetchedViaSpdy;
– chrome://net-internals/#spdy
● Firefox:– SPDY indicator
var req = new XMLHttpRequest(); req.open('HEAD', document.location, false);req.send();req.getResponseHeader('X-Firefox-Spdy');
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Valentin V. Bartenevhttp://vbart.info/, [email protected]
Btw,
is hiring!Please submit your CV to
¿Questions?