Perform the following steps:
- Navigate to the Custom domains blade of the Azure function app for which you would like to configure a domain:
- If you have created a custom domain from the Azure portal, it will prompt you to choose the hostnames, as shown in the App Service Domain blade:
- If you have chosen both of them, then that's it. All the work in integrating the function app and the custom domain is pretty much done for you by the Azure Management portal. You can view the integration of the hostnames here: