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An Introduction to
   WebSockets
      Steve Agalloco


      May 20th 2010


                       twitter.com/anno
                       beforeitwasround.com
                       steveagalloco.com
About Me

• New to Charlotte (Hello!)
• Developer at TradeKing
• recovering Java programmer, currently
  working primarily with Ruby and Rails
• interested in NoSQL, Node, HTML5
Realtime Web

• Round Trips - meta refresh, onchange
  events
• Ajax
• Comet - long polling
• Flash XMLSocket
The ugly side of Ajax
The ugly side of Comet
WebSockets
• Part of HTML5
• Bi-directional communication between
  browser and server
• Works with Proxy/Firewall
• Less network overhead
• Faster than Ajax/Comet
More Details

• It’s own protocol (ws://)
• different headers
• Language support - libraries available for
  Ruby, Node.js, Erlang, PHP, Java, Python, etc.
Possible Uses

• Realtime Data - Chat, Stocks, Sports
• Presence
• Collaboration
• Notifications
Browser Support
• Chrome and WebKit support now
• Safari 4.x (anticipated)
• Firefox 4.0 (expected in November 2010)
• Internet Explorer (no indications it’ll be
  supported in IE 9)
• Fallback to our old friend... Flash
  http://github.com/gimite/web-socket-js
Client-Side Code
Example
In the Wild



• http://hummingbirdstats.com
• http://pusherapp.com
Thank You!


• http://github.com/spagalloco - Fork me!
• http://github.com/spagalloco/websockets-
  example

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Introduction to WebSockets

  • 1. An Introduction to WebSockets Steve Agalloco May 20th 2010 twitter.com/anno beforeitwasround.com steveagalloco.com
  • 2. About Me • New to Charlotte (Hello!) • Developer at TradeKing • recovering Java programmer, currently working primarily with Ruby and Rails • interested in NoSQL, Node, HTML5
  • 3. Realtime Web • Round Trips - meta refresh, onchange events • Ajax • Comet - long polling • Flash XMLSocket
  • 4. The ugly side of Ajax
  • 5. The ugly side of Comet
  • 6. WebSockets • Part of HTML5 • Bi-directional communication between browser and server • Works with Proxy/Firewall • Less network overhead • Faster than Ajax/Comet
  • 7. More Details • It’s own protocol (ws://) • different headers • Language support - libraries available for Ruby, Node.js, Erlang, PHP, Java, Python, etc.
  • 8. Possible Uses • Realtime Data - Chat, Stocks, Sports • Presence • Collaboration • Notifications
  • 9. Browser Support • Chrome and WebKit support now • Safari 4.x (anticipated) • Firefox 4.0 (expected in November 2010) • Internet Explorer (no indications it’ll be supported in IE 9) • Fallback to our old friend... Flash http://github.com/gimite/web-socket-js
  • 12. In the Wild • http://hummingbirdstats.com • http://pusherapp.com
  • 13. Thank You! • http://github.com/spagalloco - Fork me! • http://github.com/spagalloco/websockets- example

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