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Ajax

AJAX = Asynchronous JavaScript and XML.
 
AJAX  how many types of ready states in ajax?

Four ready state

0: request not initialized
1: server connection established
2: request received
3: processing request
4: request finished and response is ready

Return A 200 Ok Status Programmatically To Ajax Request?

I ask this question for the comment of this answer: url

EDIT

I missed an important point,should also keep the connection not closed.

I'm trying to figure out how long polling actually works.

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