title: React on different subdomains
body: <p>I have a folder on my FTP with a React / Nextjs app in /myapp. My url my.app points to that folder.
  Is it possible to to add different subdomains (e.g. user1.my.app and user2.my.app) that point to the same folder /myapp. The app detects the subdomain and can set different states based on the subdomains?</p>