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Ajax long polling

Hwo can tell me about long polling ajax+php. And if you can give example.

2/10/2017 9:54:40 PM

Жадный Кот

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Web apps were created for clients making request to a server. Then, a server can't push data into the clients. Long polling was the first atempt to simulate such behavior. The client makes a request to the server, and this keep the request pendient until an update is ready