No upgrade chat

This isn't by any means a new technique: it's a variation of Comet, specifically XHR long polling, and/or BOSH.

Having a large-number of long-running concurrent requests makes the Apache part of the standard LAMP stack a dubious implementation choice.

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Another challenge is ensuring the timely delivery of the messages themselves.

The project I'm currently working on, Facebook Chat, offered a nice set of software engineering challenges: The most resource-intensive operation performed in a chat system is not sending messages.

It is rather keeping each online user aware of the online-idle-offline states of their friends, so that conversations can begin.

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No upgrade chat introduction

No upgrade chat

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