Allow custom domains to redirect the default .mintlify.app hostname

[moengadaniel]

Problem

When a Mintlify project connects a custom domain, the default '.mintlify.app' hostname remains publicly accessible and returns HTTP 200 for the same pages.

Canonical tags correctly identify the custom domain, but the legacy hostname can still appear in branded Google searches for several weeks. This fragments brand presentation, creates duplicate public URLs and can confuse visitors about which domain is official.

For example:

• Default hostname: 'https://abcd123.mintlify.app'
• Custom domain: 'https://docs.abcd123.com'

And both serve the same documentation.

Requested capability

Please add an opt-in setting under Domain setup that permanently redirects the default Mintlify hostname to the connected custom domain.

Expected behavior:

https://project.mintlify.app/path?query=value
→ 308 https://docs.example.com/path?query=value