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Web Sockets

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Paul Fryer
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WebSockets Plugging Into The Web Paul Fryer Software Architect Fiserv
What is a WebSocket? Full-duplex bidirectional communication channel. A very low overhead TCP connection. Supported in HTML5 browsers. Cross Domain Capable.
Why WebSockets? Way more faster than Log Polling. Works with firewalls/proxies. Go from kilobytes of data to 2 bytes. Go from 150ms to 50ms latency.
Polling vs. WebSockets Image Source: Kazzing.com
Polling vs. WebSockets Image Source: WebSocket.org
Browser Support
Where is it used? Rich Internet Applications (RIA) Online Games (Farmville) Chat Applications Streaming Applications Financial Data Real Time News Real Time Alerts Analytics (chartbeat)
Pusher Pusher (pusher.com) is a hosted API for quickly, easily and securely adding scalable real-time functionality via WebSockets to web and mobile apps. Example Apps Built on Pusher: http://retrospectiveapp.heroku.com http://jzlabs.com/stuff/marblepaint
Client Handshake GET /demo HTTP/1.1 Host: example.com Connection: Upgrade Sec-WebSocket-Key2: 12998 5 Y3 1 .P00 Sec-WebSocket-Protocol: sample Upgrade: WebSocket Sec-WebSocket-Key1: 4 @1 46546xW%0l 1 5 Origin: http://example.com ^n:ds[4U
Server Handshake HTTP/1.1 101 WebSocketProtocol Handshake Upgrade: WebSocket Connection: Upgrade Sec-WebSocket-Origin: http://example.com Sec-WebSocket-Location: ws://example.com/demo Sec-WebSocket-Protocol: sample 8jKS'y:G*Co,Wxa-
The Connection Data is sent in the form of UTF-8 text. Each frame of data starts with 0x00 byte. Each frame of data ends with 0xFF byte. UTF-8 text is in-between the start and ending bytes.
JavaScript API onopen: When a socket has opened onmessage: When a message has been received onclose: When a socket has been closed
JavaScript API var socket = new WebSocket("ws://localhost:8000/ServiceEndpoint/");   socket.onopen = function(){  alert("Socket has been opened!");   socket.onmessage = function(msg){   alert(msg); //Awesome!  }  
Socket.io Socket IO is a library that supports non WebSocket JS clients. It will leverage websockets if available, but fall back to other transports for earlier browsers. http://socket.io
Kaazing Enterprise Gateway
Building a WebSocket Server .Net web socket server: http://superwebsocket.codeplex.com/ Easy to build your own web socket service on base classes. Comes with an example chat application.
Everyone Go Here: bit.ly/r2a459
Ideas for Financial Industry More responsive user interfaces. Financial Dashboards Corporate Small Business Even Personal Real time reporting. Connected Devices (real time location).

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Web Sockets

  • 1. WebSockets Plugging Into The Web Paul Fryer Software Architect Fiserv
  • 2.
  • 3. What is a WebSocket? Full-duplex bidirectional communication channel. A very low overhead TCP connection. Supported in HTML5 browsers. Cross Domain Capable.
  • 4.
  • 5. Why WebSockets? Way more faster than Log Polling. Works with firewalls/proxies. Go from kilobytes of data to 2 bytes. Go from 150ms to 50ms latency.
  • 6. Polling vs. WebSockets Image Source: Kazzing.com
  • 7. Polling vs. WebSockets Image Source: WebSocket.org
  • 9. Where is it used? Rich Internet Applications (RIA) Online Games (Farmville) Chat Applications Streaming Applications Financial Data Real Time News Real Time Alerts Analytics (chartbeat)
  • 10. Pusher Pusher (pusher.com) is a hosted API for quickly, easily and securely adding scalable real-time functionality via WebSockets to web and mobile apps. Example Apps Built on Pusher: http://retrospectiveapp.heroku.com http://jzlabs.com/stuff/marblepaint
  • 11. Client Handshake GET /demo HTTP/1.1 Host: example.com Connection: Upgrade Sec-WebSocket-Key2: 12998 5 Y3 1 .P00 Sec-WebSocket-Protocol: sample Upgrade: WebSocket Sec-WebSocket-Key1: 4 @1 46546xW%0l 1 5 Origin: http://example.com ^n:ds[4U
  • 12. Server Handshake HTTP/1.1 101 WebSocketProtocol Handshake Upgrade: WebSocket Connection: Upgrade Sec-WebSocket-Origin: http://example.com Sec-WebSocket-Location: ws://example.com/demo Sec-WebSocket-Protocol: sample 8jKS'y:G*Co,Wxa-
  • 13. The Connection Data is sent in the form of UTF-8 text. Each frame of data starts with 0x00 byte. Each frame of data ends with 0xFF byte. UTF-8 text is in-between the start and ending bytes.
  • 14. JavaScript API onopen: When a socket has opened onmessage: When a message has been received onclose: When a socket has been closed
  • 15. JavaScript API var socket = new WebSocket("ws://localhost:8000/ServiceEndpoint/");   socket.onopen = function(){  alert("Socket has been opened!");   socket.onmessage = function(msg){   alert(msg); //Awesome!  }  
  • 16. Socket.io Socket IO is a library that supports non WebSocket JS clients. It will leverage websockets if available, but fall back to other transports for earlier browsers. http://socket.io
  • 18. Building a WebSocket Server .Net web socket server: http://superwebsocket.codeplex.com/ Easy to build your own web socket service on base classes. Comes with an example chat application.
  • 19. Everyone Go Here: bit.ly/r2a459
  • 20. Ideas for Financial Industry More responsive user interfaces. Financial Dashboards Corporate Small Business Even Personal Real time reporting. Connected Devices (real time location).