vhost entry for Etherpad installation behind a reverse proxy

etherpad_apache_reverse_proxy

<VirtualHost *:80>
	ServerName      example.com
	ServerAlias     *.example.com
	ServerAdmin     [email protected]
	ErrorLog        /var/log/apache2/etherpad.error.log
	LogLevel warn
	CustomLog /var/log/apache2/etherpad.access.log combined
	ServerSignature Off
    ProxyPass / http://localhost:9000/ 
    ProxyPassReverse / http://localhost:9000/
    ProxyPreserveHost on
    <Proxy *> 
            Options FollowSymLinks MultiViews
            AllowOverride All
            Order allow,deny
            allow from all
    </Proxy>
</VirtualHost>

thanks, works well