I am soon to transfer a website to my server for a client. The site is currently at www.xxx.com. On there they have a third party app in a folder on the server at www.xxx.com/app/.
The app is massive, and won't fit on our server, so they want to keep it hosted where it is and just move the rest of the site to my server. But they want to keep the url the same.
So... www.xxx.com -----> My server www.xxx.com/app/ -----> Their server
Is there any way I can achieve this with DNS?