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POPushing data from the server to browser via http
 

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    <p>In general chat application, client's browser always poll to server to check for new messages.</p> <pre><code>// the function to check new messages in server function check(){ // but this question is less about jQuery. $.ajax({ type: "POST", url: "check.aspx", data: "someparam=123", success: function(msg){ // process msg here // CHECK IT AGAIN, but sometimes we need to make delay here check(); } }); } </code></pre> <p>Then I read <a href="http://blogs.msdn.com/drnick/archive/2006/10/20/keeping-connections-open-in-iis.aspx" rel="nofollow noreferrer">Nicholas Allen's blog about Keeping Connections Open in IIS</a>. </p> <p>It makes me think if it is possible to push data from my server to client's browser by transfer chunked HTTP (it means like streaming, right?) and <b>keep the connection open</b>. </p> <p>while keeping the connection open, in server, I have idea to keep something run to check new messages. something like this, maybe</p> <pre><code>while(connectionStillOpen) { // any new message? if( AnyMessage() ) { // send chunked data, can I? SendMessageToBrowser(); // may be we need to make delay here Sleep(forSomeTime); } } </code></pre> <p>that's a raw idea.</p> <p>My Chat App created in ASP.net. With my less understanding of WCF and advanced IIS streaming module, I need your advice about to implement this idea.</p> <p>yea, <b>Impossible</b> is probably the answer. But I need to know why if its still impossible.</p> <p><strong><em>UPDATE (3 years later):</em></strong></p> <p>This is exactly what I was looking for: <a href="http://weblogs.asp.net/davidfowler/archive/2012/11/11/microsoft-asp-net-signalr.aspx" rel="nofollow noreferrer">Microsoft ASP.NET SignalR</a></p>
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