How to make Virtualbox available on Windows via localhost

Sometimes fate forces us to work with Windows.
Because Linux is so good, we get a VirtualBox to emulate it.

How can we access a webapplication via localhost:8080 from the Windows machine inside of a Webbrowser?

VirtualBox Manager -> VM-Tools -> Settings -> Network -> Port Forwarding

Name: http8080 
Protocol: TCP
HostIP: empty
Host-Port: 8080
Guest-IP: empty
Guest-Port: 8080


Name: ssh 
Protocol: TCP
HostIP: 127.0.0.1
Host-Port: 2222
Guest-IP: empty
Guest-Port: 22