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Why must we use the Domain Nameservers method for Wildcard Domains on Vercel?

The Vercel platform provides the option to set up Custom Domains, with the ability to use Wildcard Domains. As described here, you must use the Nameservers method for verification for Wildcard Domains.

Why is the Nameservers method required here?

In order to generate the wildcard certificates, Vercel needs to be able to set DNS records, since the service that Vercel uses to generate those requires us to solve a challenge to verify ownership.

For non-wildcard domains, there is no need to influence DNS records so that it can be done via HTTP.

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