How to implement dual communication between server and client via http

Posted by Alex Sebastiano on Stack Overflow See other posts from Stack Overflow or by Alex Sebastiano
Published on 2011-01-15T17:49:35Z Indexed on 2011/01/15 17:53 UTC
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http

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networking

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server

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client

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communication

I have a AJAX client which must receive messages from server. Some messages from server not like request-response type. For example, imaging game in which players can enter. Server must send to client info about player entering. But how can server send message to client via http without request from client? Only decision that i can invent: client send request to server (getNewPlayerEnter request) with big timeout, server checks state of player set, if in set new players are, then server send info to client, if not server 'sleeps' on some time, and after 'sleeping' server checks players set again. I think my desicion a little stupid(maybe not little). How implement it right?
p.s. sorry for my english

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