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From your project's Hosting page, enter the wizard for connecting a custom domain:
- If you have only one Hosting site, click Connect domain.
- If you have more than one Hosting site, click View for the desired site, then click Connect domain.
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Enter the custom domain that you'd like to connect to your Hosting site.
Optionally, you can also check the box to configure a redirect of all requests on the custom domain to another specified domain.
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Click Continue to initiate the validation process. Then, if requested, verify your domain ownership by following the on-screen instructions.
These steps ensure that your domain hasn't already been linked with a Firebase project and that you own the specified domain.
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To complete the custom domain setup, you can use the Quick Setup mode in most cases.
However, if you already have a site running on another hosting provider and need a zero-downtime migration, then select Advanced Setup from the setup mode dropdown list.
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Quick Setup — Point the DNS A records for your domain to Firebase Hosting.
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Advanced Setup — Follow the on-screen instructions either to update your domain's DNS TXT records or to upload a file to a specified location on your existing site. After verification is complete, you can safely point your DNS A records to Firebase Hosting.
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Firebase provisions an SSL certificate within 24 hours after you point your DNS A records to Firebase Hosting.
Connect a custom domain
For your custom domain, if your DNS records have A records or CNAME records that point to other providers, Firebase is unable to provision an SSL certificate.
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