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What are the differences between polling and long polling? What are the advantages and disadvantages? Is Ajax considered as long-polling?

Sam Jelveh
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polling: hitting a url from a client at some interval

long polling: hitting the url from a client and having the server hold the connection for a period of time, in this way the server can return the connection at the moment when it has information for the client

Not all ajax is long polling. Long polling is best achieved using a framework like cometd. (http://www.cometd.org)

jesse mcconnell
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  • also I have found very good link to answered my question http://stackoverflow.com/questions/3583203/server-polling-with-javascript – Sam Jelveh Jul 12 '12 at 12:43