Introducing Domain Redirects
Starting at today’s Hub release (July 6, 2022), site editors will see a new option to configure a redirect domain on their site.
Domain redirects can be configured by launching the site editor and going to Settings > Domain Settings > Modify Domain Settings > Domain Redirects

What is a domain redirect?
A domain redirect is a URL that can be set for a site that, when visited, will automatically route users to the site's current primary domain.
This is particularly useful in scenarios where a site's domain needs to be updated but links referencing the previous domain have already been shared out or cannot be easily updated. For instance - if a site's domain changes from this-domain.mysite.com to that-domain.mysite.com, setting this-domain.mysite.com as a redirect URL will route users to that-domain.mysite.com without any action needed on the visitor's part.
See redirects in action:

It happens quickly, but you can see that the set redirect - nova.cantilever.dev - automatically routes to the site’s primary domain – cool-site.cantilever.dev.
Important notes about the initial release of domain redirects:
- Redirects can be configured on sites with or without an applied custom domain BUT redirect URLs themselves must follow the same configuration requirements as custom domains:
- The default URL style of domain (*.hub.arcgis.com) cannot be used as a redirect URL
- If a custom domain is set on the site, configured redirects will ONLY point to the custom domain (as opposed to the site's default URL)
- If a custom domain is added or removed while a redirect is configured, the redirects will update to point to the new custom domain (if added/changed) or the default site URL (if custom domain is removed)
- If a redirect domain was not previously used as a custom domain in Hub, there may be a delay before the applied redirect becomes fully functional.
If you have any questions, thoughts, or suggestions for how we can improve domain redirects, please let us know! Ideas can be submitted on the ArcGIS Hub Ideas page.
Happy Hubbing!
Sydney