title: Multiple domains on 1 cloud service
body: <p>I have a app which is a website builder. Lets say the app is on a azure webrole and its domain is called www.myapp.com. </p>
  
  <p>I want to offer a service where users can use their custom domain with my app. So User 1 has a domain called ww.user1.com, user2 has www.user2.com etc. Whenever someone types www.user1.com, I want them to be able to see come to my my app ie www.myapp.com, with the browser still showing www.user1.com. You can assume I have complete access to the DNS and nameservers of these custom domains. I just need to understand how to configure this in azure. </p>