I need to redirect all requests from http://example.com/app to http://app.example.com/. In VirtualHost I can only specify a ServerName as example.com. I only want requests from the host plus a specific path to be redirected to the domain with subdomain.
<VirtualHost *:80>
ServerName example.com/app
ProxyPreserveHost Off
ProxyPass / http://app.example.com/
ProxyPassReverse / http://app.example.com/
</VirtualHost>