How do modern implementations of Comet/Reverse AJAX work? Any stable C# WCF or ASP.NET implementations?

Asked 25/3, 2011 at 1:44 Answered 13/5, 2012 at 1:32

Solved asp.net wcf comet push-notification reverse-ajax

What is the correct way (or best) way to implement Comet, HTTP Push, or Reverse AJAX?

What .NET implementations would you recommend?

Hydrophilic answered 25/3, 2011 at 1:44 Comment(0)

I have hear about, WebSync and PokeIn, both are paid implementations, I have used PokeIn and its pretty straight forward. If you are looking forward to code your own COMET implementation, I just can say that its a complex task, because you need to modify the natural behaviour if IIS. Its a hacky way to get around the limitations of the HTTP protocol and you need to know really well what you doing so don't end up breaking things around =).

It's also known as long-lived requests. This is also by far the most complex method to implement. Basically, a request is made by the client, and the server very slowly responds, which causes the connection to be maintained. Periodically, when the server has something to push, it'll "burst" send the information, so to speak. This approach gives you real-time push, which is great. But, it has a serious down-side: holding connections open like that isn't how the underlying protocols are meant to work, and most servers aren't terribly happy about it. If your traffic gets too great, you'll chew up threads on the server and wind up bringing your site down. ref: http://www.coderanch.com/t/121668/HTML-JavaScript/does-Reverse-Ajax-Works

Jacquie answered 26/3, 2011 at 22:45 Comment(2)

What do you think of using Silverlight's HTTP Push technology as a bridge to Javascript as described here #5450142 – Hydrophilic 30/3, 2011 at 19:32

I have no experience with silverlight, checkout this response #640988, if those are included as part of Silverlight SDK, then it should be safe to use. – Jacquie 30/3, 2011 at 19:51

JOBG is correct re: the complexities; it's probably not a task you want to undertake lightly. I'm one of the authors of WebSync, and I can attest that it's a difficult task.

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