Introduction to WebSockets

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  • 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
  • 10. Client-Side Code
  • 11. Example
  • 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