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    <p>Your proposed solution sounds like <a href="https://stackoverflow.com/questions/333664/simple-long-polling-example-code">long polling</a>, which could work really well.</p> <p>You would request <code>/game/17/move/5</code> and the server will not send any data, until move 5 has been completed. If the connection drops, or you get a time-out, you simply reconnect until you get a valid response.</p> <p>The benefit of this is it's very quick - as soon as the server has new data, the client will get it. It's also resilient to dropped connections, and works if the client is disconnected for a while (you could request <code>/game/17/move/5</code> an hour after it's been moved and get the data instantly, then move onto <code>move/6/</code> and so on)</p> <p>The issue with long polling is each "poll" ties up a server thread, which quickly breaks servers like Apache (as it runs out of worker-threads, so can't accept other requests). You need a specialised web-server to serve the long-polling requests.. The Python module <a href="http://twistedmatrix.com/trac/" rel="nofollow noreferrer"><code>twisted</code></a> (an "an event-driven networking engine") is great for this, but it's more work than regular polling..</p> <p>In answer to your comment about Jetty/Tomcat, I don't have any experience with Java, but it seems they both use a similar pool-of-worker-threads system to Apache, so it will have that same problem. I did find <a href="http://www.ibm.com/developerworks/web/library/wa-aj-hiperform/index.html" rel="nofollow noreferrer">this post</a> which seems to address exactly this problem (for Tomcat)</p>
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    1. COI'm using Jetty as a Java servlet container. It seems to work just fine for "long polling". Does it have the same problems as Apache (namely, running out of worker threads)? What about Tomcat?
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