2012-06-18 06:28
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什么是 Long-Polling、 Websockets、 Server-Sent Events (SSE)和 Comet?

I have tried reading some articles, but I am not very clear on the concepts yet.

Would someone like to take a shot at explaining to me what these technologies are:

  1. Long Polling
  2. Server-Sent Events
  3. Websockets
  4. Comet

One thing that I came across every time was, the server keeps a connection open and pushes data to the client. How is the connection kept open, and how does the client get the pushed data? (How does the client use the data, maybe some code might help?)

Now, which one of them should I use for a real-time app. I have been hearing a lot about websockets (with [a node.js library]) but why not PHP?


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