I am looking for an example to use Apache as a front end to two tomcat servers running on different ports on same machine.

ProxyPass /site1 http://site1.local.com:8080/

ProxyPassReverse /site1 http://site1.local.com:8080/

as in Apache there is Document Root to serve webpages 

I found Tomcat uses webapps folder and I need to put in my application there.

Which I have done.

But how do I configure a ReverseProxy so that some one can reach from internet.

I tried looking the ProxyPass documentation but I am not clear with how does it rewrites headers or requests.