Do you have php5-mysql and what php version are you using?
I tested the system with Bitnami Wampp 7.0
Also I tested the system on Linux Ubuntu with Apache2 + PHP5 + PHP5-MYSQL + MYSQL-SERVER.
And if needed try to use ?page= behind your link.
If you have configured everything right it should work with the serverurl in ue4 http://localhost/api/
You can also try