Reverse Ajax

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Reverse Ajax refers to the combined use of Ajax for sending data from client to server, and some mechanism for pushing server data back to the browser.[1]

This server–client communication takes one of several forms:

  • Comet, a connection between a server and client is kept open, by slowly loading a page in a hidden frame.
  • Polling, the client repetitively queries (poll) the server.

Reverse Ajax is an umbrella term which describes the implementation of any of these models.

[edit] Examples

As a simple example, imagine we have 2 clients and 1 server, and client1 needs to send the message "hello" to every other client.

With polling
  • client1 sends the message "hello"
  • server receives the message "hello"
  • client2 polls the server
  • client2 receives the message "hello"
  • client1 polls the server (unnecessary traffic starts)
  • client1 receives the message "hello"
  • client2 polls the server
  • client2 receives the message "hello" (unnecessary traffic continues)
and these last lines repeat forever.
With Comet
  • client1 sends the message "hello"
  • server receives the message "hello"
  • server sends the message "hello" to all clients

Note that in the Comet less traffic is generated.

[edit] See also

[edit] External links


Implementations
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