Na sua configuração do Apache VirtualHost, ambas as linhas leem ProxyPassReverse
:
<Location />
Order deny,allow
Allow from all
ProxyPassReverse http://127.0.0.1:8080
ProxyPassReverse http://git.example.at/
</Location>
Eu acho que deveria ser:
<Location />
Order deny,allow
Allow from all
ProxyPass / http://127.0.0.1:8080
ProxyPassReverse http://git.example.at/
</Location>