How to prevent reverse proxying on certain ports (mod_proxy)? - apache

Question

I am using apache to proxy to tomcat webapps, which works fine. I previously had tomcat listen directly on :8080, so I would like to inform users of my webapp of the move. To that end, I defined a vhost to listen to 8080 where a static html page should be served with the new link. To that end, I defined the following vhost:
Listen 8080
NameVirtualHost domain.example.com:8080
<VirtualHost domain.example.com:8080>
ProxyPass /webapp !
DocumentRoot /var/www/htdocs/vhost-8080
</VirtualHost>
Where the directory vhost-8080 has an index.html with the new link in it.
But every time I load domain.example.com:8080/webapp, I am directed towards tomcat and the webapp, even though domain.example.com:8080/ loads the index.html file I put in the vhost-8080 directory. How can I prevent proxying on this port and only enable it on 80?
For the sake of completeness, here's my proxy configuration:
ProxyPreserveHost On
ProxyRequests Off
<Proxy ajp://localhost/webapp >
Order Deny,Allow
Deny from none
Allow from all
</Proxy>
<Location /webapp>
ProxyPass ajp://localhost:18009/webapp timeout=1200
ProxyPassReverse http://localhost/webapp
</Location>
Tomcat has ajp connector enabled and http connector disabled.