title: vercel.json redirection from another url
body: <p>I have two domain names: <a href="http://www.domain1.com" rel="nofollow noreferrer">www.domain1.com</a> and <a href="http://www.domain2.com" rel="nofollow noreferrer">www.domain2.com</a>. They need to point to domain3/domain1 (for domain1) and domain3/domain2, but keep their own URL.</p>
  <p>Basically I want to catch in the json what URL the redirection is coming from and then choose where to redirect to BUT keep the URL from where it came from.</p>
  <p>Can someone please help me or let me know if it's possible or not.</p>
  <p>Thanks.</p>