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Google Stockholm, April 12th
2016
Email:daniel@haxx.se
Twitter:@bagder
Web:daniel.haxx.se
Blog:daniel.haxx.se/blog
Daniel Stenberg
Future
HTTP Today
HTTP/2
Status
Deploy
Internet TodayInternet Today
HTTP forHTTP for everythingeverything
The web hasThe web has changedchanged
significantlysignificantly since the 90ssince the 90s
Request and payload growth
in the last 4 years...
8080
100100
800K800K
2300K2300K
the average website loads 50+ resources on a
single domain
connections per page
Roundtrip Bonanza
Latency adds up
4,000 ms
750 ms
Page load
time
Round trip
time
0 ms 240 ms
Speed of light
The world is still big
+ slower through fiber
+ never the shortest distance
+ buffer (bloat)
+ radio networks =
Several hundred milliseconds
Head of line blockingHead of line blocking
HTTP 1.1HTTP 1.1
workaroundsworkarounds
SpritingSpriting
InliningInlining
.icon {
background:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABGwAAAGDCAIAAADxuBH7AAA
AAXNSR0IArs4c6QAAAAlwSFlzAAAOdQAADnUBuWNRMgAAAAd0SU1FB9kLHRYqOHOE8mAAACAA
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ErmuV5UWaKrvVwiEj+8THxcXHJSBAAAghjAADYIQwAoQAA0KtV2xSoEApBUqBUEoAyE8H...
) no-repeat;
}
Concatenation
$ cat *.js > single-monster.js
Sharding
Http2
HTTP history lesson
1996: HTTP/1.0 RFC 1945
1997: HTTP/1.1 RFC 2068
1999: HTTP/1.1 RFC 2616
2007: HTTPbis started to refresh HTTP/1.1
2009: Google announced SPDY
2011: Chrome and all Google services run SPDY
2012: HTTP/2 work began, based on SPDY
2014: HTTP/1.1 updated, RFC 7230 series
2015: ...
RFC 7540RFC 7540
Just a new framing layer
maintains HTTP paradigms
http:// and https:// URLs remain
HTTP/1.1 will linger for decades
Proxies to convert 1:1
Conservative in what you accept
less optional parts
no minor version
Binary
No more telnet
Easier framing
TLS and compression anyway
Wireshark inspector
frame types, like HEADERS and DATA
Multiplexed (1/2)
Multiple streams over a single physical connection
Max number of parallel streams set by peer
Multiplexed (2/2)
Connection coalescing
1.2.3.4
2.3.4.5
1.2.3.4
3.4.5.6
IP address range overlap
Both SAN names in cert
“unsharded”
One TCP connectionOne TCP connection
Better utilization of bandwidth
Streams
Dependencies
Flow control
Have streams
depend on other
streams that
should arrive first
Priorities
Change a stream’s
“weight” at any time
Allow streams to be
consumed at
different speeds
Header compression
headers are big and repetitive
1.1 has no header compression
HPACK
Server push
Give me HTML please!
Here's HTML for you
Here's CSS for you
Negotiate HTTP/2 on HTTP://
Upgrade:
Negotiate HTTP/2 on HTTPS://
ALPN
HTTPS-only HTTP/2HTTPS-only HTTP/2
TCP on port 80 – HTTP/1 !!
Upgrade: ? No way!
privacy and user protection
Safer HTTPSSafer HTTPS
No compression
No renegotiation
TLS 1.2 or later
Cipher suite requirements
HTTP/2 is not
Mandatory TLS
Changing HTTP headers
Websockets
Implementations
Akamai Ghost, Apache HTTP Server, Apache Traffic
Server, http4s-blaze, Chromium, Chicken Scheme
hpack lib, cl-http2-protocol, curl and libcurl, Dart,
Deuterium, Ericsson MSP, F5, H2O, Haskell http2 lib,
http-2, http2, hyper, hyper, Shaka Technologies
Ishlangu Load Balancer, Jetty, LiteSpeed Enterprise,
Lucid, Microsoft, mod_h2, Mozilla Firefox, Netty,
nghttp2, Radware, NGINX, node-http2, OkHttp,
OpenLiteSpeed, Protocol::HTTP2, Brocade SteelApp
Traffic Manager (formerly Riverbed/Zeus TM), Sasazka,
second-transfer, ShimmerCat, Test GFE, Trusterd,
Twitter, Undertow, Warp, Wireshark, WKWebView
https://github.com/http2/http2-spec/wiki/Implementations
servers
browsers
http://caniuse.com/#search=http2
HTTP/2 in Browsers – April 2016
Browsers only over HTTPS
Firefox: 23% HTTP/2
35% of HTTPS is HTTP/2
HTTP/2 in 85% of browsers in Sweden
Chrome will remove support for SPDY
in May 2016
HTTP/2 for content – April 2016
7% of top 10 million
9% of top 1 million
19% of top 500
>50% for most sites
Akamai went “live” late March 2016
Googlebot groks HTTP/2 ”early 2016”
Amazon Cloudfront “this year”
Jul 15 Jan 16 Apr 16Jan 16
deploydeploy
Poking at it
HTTP/2 and SPDY indicator
Apache, NGINX,
H2O, ATS, Caddy, Litespeed
nghttp2
curl
wireshark
h2i
Challenges for you
h2 is straight-forward, but ...
HTTPS is not
OpenSSL / other TLS-lib versions and ALPN
Mixed content
Certificates
HTTP/2 – what to expect for your site
It depends
20% - 60% faster is common
Server push makes a difference
Remember: HTTPS
Shorten dependency chains!
the HTTP futurethe HTTP future
Improving what we have
h2 server push improvements
h2 client certs?
(slightly) improved cookies
TCP tuning for HTTP
More HTTPS
Better h2 tools, more h2
comparisons
Beyond HTTP/2
Time to drop HTTP/1 legacies
HTTP/3 will happen faster
QUIC…?
QUIC and the OSI model crash
TCP, TLS and HTTP/2 over UDP in userspace
no TCP head of line blocking
other congestion control
move across interfaces
forward error correction
“TCP improvements” - much faster
Final recapFinal recap
binary + multiplexedbinary + multiplexed
primarily over TLSprimarily over TLS
users won't see a “2”users won't see a “2”
deploy!deploy!
Questions?
http://daniel.haxx.se/http2http://hpbn.co/
Doing good is part of our code
Thank you!
Credits
HTTP and TCP trend numbers from
http://httparchive.org
RTT / page load data from Mike Belshe
Front and HTTP future images by Simon
Stålenhag
HTTP/2 lego frame image by Mark Nottingham
HTTP/2 usage numbers by Mozilla Telemetry
Lego pieces borrowed from my kids
License
This presentation and its contents are licensed
under the Creative Commons Attribution 4.0
license:
http://creativecommons.org/licenses/by/4.0/

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