A new version of FlyingAnt has been released (V1.0 Build 1003). The new version fixes a bug on OSX systems where the server sometimes didn't exit when the exit URL was requested.
The bug was caused by OSX not honouring the no caching directive in the exit pages html. This has been fixed by adding no caching directives to the http headers sent out by the server.
The new version can be found at the downloads page.