301 Redirect but Adding Original URL and Referrer

Thanks Kees.

I got it to work but app owner says that they are seeing below,

Location: https://https://NEW-APP.com/redirect?url=http://old-app.com-help/URI/URI1/URI2/URI3

Instead of this,

Location: https://NEW-APP.com/redirect/?url=http%3A%2F%2Fold-app.com%2FURI%2FURI1%2FURI2%2FURI3

They also want to have a cache-control header

Cache-Control: no-cache, no-store, must-revalidate, max-age=0

Also the referrer does not seem to work as F5 doesn't include the referrer in the redirect URL.

TIA.