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First, I want to make clear that I am not talking about this question How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers? , which is about simultaneous requests.

Instead, I want know if there is a limit on the number of pending ajax requests, before the browser potentially starts cancelling them or throwing errors.

Running some simple tests, I've seen that when the limit of about 6 simultaneous requests is hit, the browser will start queuing requests in a graceful manner. Once a 'slot' becomes available, it is used and a new request is sent to the server.

I have also seen that Chrome, Firefox and even IE will gracefully handle a queue of about 100 requests.

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    as you're already testing aren't you the best person to answer this question? Commented Aug 19, 2011 at 18:19
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    I would guess that memory is the only limitation. I don't think there is much of a resource impact of queued requests. I guess testing-to-destruction will be the only way to know for sure. Commented Aug 19, 2011 at 18:43
  • This : stackoverflow.com/questions/561046/… Commented Aug 20, 2011 at 0:37
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    As per firefox 3.6.18 config , the network.http.max-connections is 30 ,network.http.max-connections-per-server is 15,network.http.max-persistent-connections-per-server is 6,network.http.pipelining.maxrequests is 4 . From this can you find something??? I'm not sure what this is about! Commented Aug 23, 2011 at 11:21
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    I'm not sure I understand your distinction between 'simultaneous' requests and 'pending' requests..if a request hasn't completed, then it is open, and hence by definition is 'simultaneous' with any requests open at the same time. If I did misunderstand something could you clarify please? Commented Aug 23, 2011 at 21:22

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I also guess that it's indicated from maximum number of current opened connection and here's the situation in IE Max-Connections and this thread also may help How many concurrent AJAX requests are allowed in popular browsers?

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