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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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It is worth noting that browsers can generally only handle 6 ajax requests at a time, this may catch you out.
How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers? Bookmark this question. Show activity on this post. In Firefox 3, the answer is 6 per domain: as soon as a 7th XmlHttpRequest (on any tab) to the same domain is fired, it is queued until one of the other 6 finish.
AJAX just uses a combination of: A browser built-in XMLHttpRequest object (to request data from a web server) JavaScript and HTML DOM (to display or use the data)
Not possible. It's the browser's responsibility.
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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