I have a client with a site at subdomain.example.com/folder
I've cloned it locally in MAMP. Once I've made some changes, I need to host it at an alternative physical server. (I intend to use a dedicated server I have access to with a technical domain name currently). However, the client would like to keep the existing URL as it has been used extensively in marketing.
I've done HTTP redirects and forwards and 301 redirects in the past, but I'm not sure how or even if I can do what the client wants. How can I achieve this, possibly using .htaccess and DNS entries?
Caveats: I can't have the site at a 3rd party domain and the client isn't able/allowed to register any additional domains.