It looks like a common false positive for Cyberbot II is:
http://www.domain.com/ -> http://domain.com/
or
http://domain.com/ -> http://www.domain.com/
To avoid this, we should only check for redirects if the URL has content after the domain name, i.e. http://www.domain.com/something.
We should also create tests for this. Some potential test cases:
http://astraldynamics.com
http://www.astralbob.com