possible for flash widget to send POST request to an external domain?

is it possible for f开发者_如何学编程lash widge on site a.com to send POST request to b.com ?

If so, couldn't this be quite dangerous ? A user would be performing POST to an unknown host.

Yes, it is possible, but the other domain would have to serve a crossdomain.xml policy file. And if you think about it: Every time you hit a button on any page, you could be sending a hidden form to an unknown host. Also, once things are sent to a server, there is no way of telling what happens to them afterwards - they could be forwarded anywhere. So yes, it's dangerous. But it's no more or less dangerous than any other activity on the internet.