HTML5 WebSocket & Communication

HTML5 WebSocket & CommunicationAbout HTTP
• HTTP was originally designed for document transfer
• Until now, it has been cumbersome to achieve real time, bi-directional web communication due to the limitations of HTTP
• HTTP is half-duplex (traffic flows in only one direction at a time)
• Header information is sent with each HTTP request and response, which can be an unnecessary overhead

About Ajax and Comet
• Great toilet cleaners…
• Ajax (Asynchronous JavaScript and XML) can be used to build interactive Web apps
o Content can change without refreshing the entire page
o User-perceived low latency
• “Real-time” often achieved through polling and long-polling (Comet or Reverse Ajax)
o Comet lack of a standard implementation
o Comet adds lots of complexity

Polling
• Polling is “nearly real-time”
• Used in Ajax applications to simulate realtime communication
• Browser sends HTTP requests at regular intervals and immediately receives a response
• In low-message-rate situations, many connections are opened and closed needlessly
…

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Click here to download HTML5 WebSocket & Communication.

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