Long Polling with Ajax and PHP - Apache freezes

Question

We try to implement long-polling based notification service in our company\'s ERP. Similar to Facebook notifications.

Technologies used:

• PHP with

Answer 1

Passerby in first comment of previous post gave me good direction to check out if we hit max browser connections to one server.

As it turns out, each browser has those limit and you can't change them (as far as I know). We made a workaround to make it work.

Let's assume that I was getting AJAX data from

http://domain.com/ajax

To avoid hitting max browser connections, each long-polling AJAX connects to random subdomain, like:

http://31289.domain.com/ajax
http://43289.domain.com/ajax

and so on. There's a wildcard on a DNS server pointing from *.domain.com to domain.com, and subdomain is unique random number, generated by JS on each tab.

For more information, check out this thread.

There's been also some problems with AJAX Same Origin Security, but we managed to work it out, using appropriate headers on both JS and PHP sides.

If you want to know more about headers, check it out here on StackOverflow, and here on Mozilla Developer's page. Thanks!