This is required for the substitution of different HTTP servers or the newer HttpServer.dll without having to commit to a particular implementation.
This is also required to write regression tests that involve the HTTP layer.
If you need to recompile, all you need to do is replace OSHttpRequest/OSHttpResponse references with IOSHttpRequest/IOSHttpResponse.
This is to accomodate situations where the authorization service is being used by the hypergrid, where visitors have no user account.
See http://opensimulator.org/mantis/view.php?id=5517, this code is somewhat adapted/cleaned up from Michelle's patch
I'm a little ambivalent about this since visitors could put anything in firstname/lastname so it's not much of an auth measure.
It's up to the auth service to decide which data it actually uses.
Possibly we should be passing through other info such as agent circuit ip
