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A custom domain lets people open your published site at an address you own, such as www.yourbrand.com. The project also keeps its Mythos *.r21.dev address.
Mythos connects domains you already own. It does not register or sell domain names.

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Before you start

You need:
  • a Mythos project with a completed Build;
  • a domain registered with a DNS provider;
  • permission to change that domain’s DNS records.
You can prepare the domain before the first publish. It begins serving the site only after the project is published and the domain shows Connected.

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Connect a domain

1

Open Domains

In the project workspace, select More → Domains. You can also start from Add domain in the Publish panel.
2

Enter the hostname

Under Custom domains, select Connect domain and enter the exact address you want to use, such as www.yourbrand.com.
3

Add the DNS records

Sign in to your DNS provider and copy every name and value exactly as Mythos shows it. Do not add https:// or a page path to the hostname.
4

Check the connection

Return to Mythos and select Check. DNS changes are not always immediate, so you may need to wait and check again.
5

Wait for HTTPS

After DNS is valid, Mythos prepares HTTPS for the domain. The domain is ready to share when its status becomes Connected.

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Understand the status

If you connect more than one domain, select Make primary on the address you want to present as the main custom domain.

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Domain and publishing behavior

  • The project must remain published for either the custom domain or its *.r21.dev address to work.
  • Updating the published site updates every connected domain for that project.
  • Changing the Mythos subdomain does not disconnect your custom domains.
  • Unpublishing the project stops the site on all of its addresses.

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Disconnect a domain

Use Disconnect beside the hostname in More → Domains. This removes the domain from the Mythos project, but it does not change or delete records at your DNS provider. Remove those records there if you no longer need them.
Disconnecting a domain breaks links that use that address. Confirm that another working URL is available before removing a domain that visitors already use.

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Troubleshooting

Compare every record with the values shown in Mythos. Some providers automatically append the root domain to a name, and some require ALIAS, ANAME, or CNAME flattening for the root domain. DNS changes can also take time to appear publicly.
Certificate setup starts after DNS verification and may take longer. Leave the records in place and select Check again later.
Confirm that the Mythos project is currently published. A connected domain does not serve a private or unpublished project.