#Multipart.as
A multipart form data request generator
##Demo :
http://labs.positronic.fr/flash/multipart/
##Restrictions :
###navigateToURL :
In Flash Player 10 and later, if you use a multipart Content-Type (for example "multipart/form-data") that contains an upload (indicated by a "filename" parameter in a "content-disposition" header within the POST body), the POST operation is subject to the security rules applied to uploads:
- If the POST operation is cross-domain (the POST target is not on the same server as the SWF file that is sending the POST request), the target server must provide a URL policy file that permits cross-domain access.
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/package.html