ActionScript 3.0 :: Polling With URLLoader Gives Sporadic IoError #2032?

Jul 8, 2008

I have a flex app that polls a php script every 1-2 seconds and returns new data. The polling is done with a URLLoader.load call;the requests are HTTP GETs. The app listens for Event.COMPLETE, handles the incoming data, waits for 1 second, then makes another URLLoader.load call.

This process works perfectly for any duration from 4 to 20 minutes. Eventually, a URLLoader.load call fails to return Event.COMPLETE. Instead it hangs for 60 to 180 seconds (depending on which local network I'm using for internet access) and finally returns an ioErrorEvent.IO_ERROR with the message "Error #2032: Stream Error. URL: <mysite.com/foo.php". The app tries to make another URLLoader.load call, but from this point onward, none of the loads return Event.COMPLETE. Also, none of these post-error HTTP GETs appear in the access.log file of my apache (2.0.55) webserver. The app will not work again until I close and reopen the browser.

I've spent several days trying to figure this out! The time until the app crashes appears to be completely random. The problem occurs in both Firefox (2.0.0.15) and IE (7.0.5730.11). I've read that sometimes 2032 errors can be related to caching, but there's no directives (in .htaccess file or httpd.conf file) that sets the Pragma or Cache-Control response header to "no-cache".

I can't tell if the problem is on client or server end. Based on the adobe language references and the forum posts I've read, this seems to be an appropriate use of URLLoader. (In case you're wondering I want the app to respond to events in near real-time. I originally used xmlsocket to push data to app from server. However, this communication is blocked by corporate firewalls, so I need an alternative method)

Here is (cleaned up) code:

[Code]...

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