Flex :: File Upload - 4 FileReference With Firefox

May 11, 2011

I'm trying to perform a file upload using a FileReference from a Flex app running in Firefox 4. However when I attempt to call the upload() method, the Filereference throws an IOError with the following Error #2038: File I/O Error. URL: [URL] If I don't explicitly add a listener for the IOErrorEvent, then I get a Flash player popup stating SecurityError: Error #2000: No active security context.

The request doens't even hit my server (I can verify by placing breakpoints in the Java code and watching the HTTP Requests that go out using HTTPFox), so it seems to me that this is a client side issue (right?). I've done some searching for the problem on google and the suggestions included wrapping the upload() call in a timeout/callLater, and attempting to attach the sessionId to the request (since Firefox creates a new thread for the upload and doesn't attach the proper cookies). Neither of these approaches has worked for me. I don't experience this problem with Internet Explorer, only Firefox.


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