Ok Till thank you for your comment seems like i'm in the right direction...
this is a extract from my vhost file on the website that I want to run apache reverse proxy...
Allow from all
ProxyPass /example http://server2.example.com/
ProxyPassReverse /example http://server2.example.com/
i have also added a CNAME in dns:
It comes up with a error not found which is different than before so I am on the right track "hope"
What am I doing wrong?