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Andreas Bjärlestam   2012-02-23
SPDY quick overview
• An evolution of HTTP
• Developed by Google since 2009
• Openly available spec
Why the hell would you want to
        replace HTTP?
HTTP is fantastic

it has totally changed the world
but…
HTTP is over 20 years old


HTTP 1.1 is 12 years old
Webpages in 1999
SPDY - or maybe HTTP2.0
Webpages in 2012
SPDY - or maybe HTTP2.0
Mobile internet usage




source: svenskarnaoch internet 2011 https://www.iis.se/docs/SOI2011.pdf
This is how more and more of us
        consume the web…
Often it feels a lot like…
People no longer have patience to
       wait for slow pages
Web pages February 2012
•   www.facebook.com - ca 100 http requests
•   www.bostonglobe.com - ca 100 http requests
•   www.svtplay.se - ca 90 http requests
•   www.aftonbladet.se - ca 350 http requests




                              source: http://httparchive.org/
What does it look like over the
network fetching 100 resources?
SPDY - or maybe HTTP2.0
Can you spot the problem?
Its all synchronous
How come an advanced page like
  facebook.com loads in under 4
seconds when its all synchronous?
Hacky optimizations

        CSS sprites
base64 images in data-urls
    CSS concatenation
 JavaScript concatenation
6 x HTTP connections
       HTTP/TCP


       HTTP/TCP


       HTTP/TCP


       HTTP/TCP


       HTTP/TCP


       HTTP/TCP
What is the problem with this? Why
          not even more?
Wasted resources
TCP Congestion control
2 connections per host recommended
          by HTTP 1.1 spec


  6 connections in most browsers
Domain sharding

• www.bostonglobe.com - 59 connections
• www.svtplay.se - 22 connections
• www.aftonbladet.se - 118 connections




                          source: http://www.webpagetest.org
We kind of abuse TCP
when we open more
    connections
and…
New TCP connections are slow
3 way handshake
On my macbook
 Ping 20ms ≈ 30ms to set up a
         connection


      On my mobile (3G)
Ping 300ms ≈ 450ms to set up a
         connection
TCP Slow start
    HTTP/TCP


    HTTP/TCP


    HTTP/TCP

    HTTP/TCP

    HTTP/TCP

    HTTP/TCP
It turns out that page load time for a moderately
   complex site is almost no faster over
   20mbits/sec than over 2mbits/sec
So… we need to utilize our TCP
     connections better
Enter
Don’t we break the web if we replace
              HTTP?
Nope
The semantics of HTTP is kept
or in simpler words…

SPDY implements the HTTP API
HTTP -> SPDY

   GET                        GET
   PUT                        PUT
              HEADERS                    HEADERS
   POST                       POST
    …                          …




Use of URLs   Use of TCP   Use of URLs   Use of TCP
You can switch to SPDY with no
changes to your web application
SPDY runs over TCP and will not
  require upgraded network
          equipment
HTTP -> SPDY

                    HTTP


 HTTP               SPDY


TLS/SSL            TLS/SSL


TCP/IP             TCP/IP
Designed with
   speed as
 primary goal
1 TCP connection



     HTTP/TCP
But it will be on fire!



        HTTP/TCP
SPDY is multiplexed
This is a typical HTTP session
             GET

            200 OK

             GET

            200 OK

             GET

            200 OK
Multiplexing
    GET 1
    GET 2
    GET 3


   200 OK 2
   200 OK 3
   200 OK 1
Stream priorities
SPDY is binary
Will be difficult to just fire up telnet
           and hack away
Every decent site will be encrypted
      and gzipped anyways
TLS/SSL is mandatory
Communication should be
        secure by default


Users should not
  have to care
Using SSL ensures that
communication over existing
   proxies is not broken
..but you will not be able to
 use proxies for caching etc
Headers are compressed
How will the client know that it can
   use SPDY towards a server?
NPN

TLS Next Protocol Negotiation
Server Push
Server Push
So is it worth it?
Google tested 25 of the
   “top 100” sites
Average speedup

  39% - 55%
SPDY could make your life easier

Less need for hacky optimizations
       like CSS sprites, file
concatenations, domain sharding
                etc
Should I add SPDY support to my
     servers on Monday?
Probably not…
Implementations
•   Apache mod_spdy
•   Nginx – in roadmap
•   node_spdy – requires node.js 0.7
•   netty
•   more…
Example…
Browsers
• Chrome (since version 6)
• Firefox 11 (turned off by default)
• (Amazon silk)
CDNs
• Strangeloop
• Contendo
CDNs

             SPDY     Your web
Browser
            Gateway    server
Google
• Support SPDY on most of their services
• 90% of their SSL traffic is over SPDY
Amazon silk


  Silk    SPDY      SPDY     HTTP     The
Browser            Gateway          Internet
The spec
• Draft spec, version 3
• Plan is to submit it to IETF as input to HTTP2.0
• IETF HTTPbis WG chair recently proposed to
  start work on HTTP2.0
Alternatives
HTTP Pipelining
• Not as effective as multiplexing
• Hard to implement in browser
• Opera is the only desktop browser that has a
  full implementation enabled by default
• Android, IOS5 and Opera mobile browsers do
  some amount of pipelining
• Not used by most proxies
Synchronous   Pipelining     Multiplexing

    GET            GET 1          GET 1
                   GET 2          GET 2
   200 OK
                   GET 3          GET 3
    GET
   200 OK         200 OK 1       200 OK 2

    GET           200 OK 2       200 OK 3
                  200 OK 3       200 OK 1
   200 OK
Alternative transport protocols
• SCTP
• BEEP
Roundup
•   ~ 50% Faster page loads than HTTP
•   Backwards compatible with HTTP
•   Better utilization of TCP
•   Secured by default
•   Binary + compressed
•   Will likely be the base for HTTP2.0
Attributions
• http://en.wikipedia.org/wiki/File:US_Robotics_56K_M
  odem_Front.JPG
• https://www.iis.se/docs/SOI2011.pdf
• http://www.flickr.com/photos/howi/6366423373/
• http://www.flickr.com/photos/wwarby/5110037138/
• http://www.flickr.com/photos/alicetragedy/497729529
  8/
• http://www.flickr.com/photos/koltregaskes/624914973
  /in/photostream/

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SPDY - or maybe HTTP2.0