Reality-Loop

Learned today: Reverse Ajax

August 06, 2009 | 1 Minute Read
This post was originally posted on my old blog.

http://directwebremoting.org/dwr/media/dwr-logo-200.gif Issue 1.09 of Javamagazin has an interesting article about DWR.

Particularly nice is the explanation and overview of Reverse Ajax.

There are three techniques how to realize Reverse Ajax:
  • Polling - bases on continuous requests by the client, if the server has data he can put it in a response.


  • Comet - based on long requests, there is always a request available on which the server can send a response. Comet itself can be realized in two ways:

  • Long Polling: Server sends a complete HTTP Response. Request is closed. Client immediately sends a new request.

  • Streaming: The server returns only a Partial HTTP Response, the initial request is not closed.

  • Piggyback - fully passive, client events are needed. Server sends additional data on top of a normal response.



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