My team is trying to setup an Apache reverse proxy from a customer\'s site into one of our web applications.
http://www.example.com/app1/some-path maps to http://intern
Basically, ProxyPassReverse
should take care of rewriting the Location header for you, as Kevin Hakanson pointed out.
One pitfall I have encountered is missing the trailing slash in the url argument. Make sure to use:
ProxyPassReverse / http://internal1.example.com/some-path/
(note the trailing slash!)