To enable WebApp1 to handle requests for the website: Add a custom domain name. To point client connections to WebApp1: Modify a DNS record.

For an Azure App Service web app to accept and correctly serve requests addressed to https://www.fabrikam.com rather than only its default *.azurewebsites.net hostname, the custom domain www.fabrikam.com must be added and bound to WebApp1 -- this is the specific configuration step that makes the app recognize and handle that custom hostname at all. Creating a deployment slot supports staged rollout and swap scenarios and does nothing to bind a custom domain, and creating a private endpoint provides private, VNet-restricted connectivity rather than public custom-domain handling, so neither accomplishes the stated goal. Once WEB1 and WEB2 are decommissioned per the migration plan, client traffic that currently resolves to those on-premises-facing web servers must instead be directed to WebApp1; since DNS is what resolves the www.fabrikam.com name to a specific endpoint, the DNS record for that hostname must be modified (typically to a CNAME record pointing at WebApp1 ' s default hostname, together with the domain-verification TXT record Azure requires before it will accept the custom domain binding). Azure Front Door and Azure Traffic Manager are global routing and load-balancing services meant for multi-region or multi-endpoint failover scenarios and are unnecessary complexity for redirecting a single custom domain to a single web app, and adding HTTP redirect rules on WEB1/WEB2 is not a viable option once those servers have been decommissioned. Therefore, adding a custom domain name to WebApp1 and then modifying the DNS record are the two required actions.