Httpd with mod_proxy redirect

Hi team,

I was like unable to solve this interview question, Any help from them experts here please..

"Your supervisor requires that all web requests for "http://dev.example.net" be passed to "http://newdev.example.net". She states that upon redirect, the URL in the web browser must remain "http://dev.example.net". Please configure Apache using mod_proxy so that her proxy requirements are met. Note: The newdev.example.net landing page is stored at /var/www/index.html"

The question is consist on mod_proxy!

It seems that they were asking to just direct the new site to the old url. I believe that is handled in the main config file.
It could also possibly be an alias configuration add.
I will do some more digging and post back.