How to set up Charles proxy for standalone Flash player during FlexUnit integration tests?

I'd like to record the AMF traffic that happens during some of my Flex application unit tests. I am using Maven/flex开发者_如何学JAVAmojos to compile the unit tests. I've installed Charles proxy and can get it to work from Firefox, but how can I get it to work from the standalone Flash player that flexmojos/FlexUnit invokes to run the integration tests to my BlazeDS backend Java server?

After failing to find anyway to do this (on Ubuntu), I used the reverse-proxy capability of Charles to have it act only as a proxy for the BlazeSD server. So far anyway, it seems very capable of reverse-proxying AMF traffic. Nice.