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The real-time story (Polling (AJAX, requests at regular intervals and…
The real-time story
Polling
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Optimization: should know when messages are ready in a predictable manner to reduce number of requests
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Web Sockets
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full-duplex, bidirectional communications
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a true standard that you can use to build scalable, real-time web applications
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Java Applet, Flash, Silverlight
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Developers don't want to depend on plugin environment as they change too often and have compatibility issues