301 Redirect - Two Azure Web Apps

I have an application running on old-example-app.azurewebsites.net. I want to setup a redirect from that application to another one in Azure that is new-example-app.azurewebsites.net. I want to accomplish this without having to make a code change and redeployment because I don't have deployment slots and my old-example-app has a lot of active users. Is there any setting I can enable or modify on the web app settings in Azure or am I stuck making a new deployment?

Solution

You can make use of Azure Application Gateway with Multi-site listener to route 2 URL's between your old azure web app and new azure web app.

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In your backend pool, Add 2 backend pools 1 for old-example-app.azurewebsites.net App and 2nd for new-example-app.azurewebsites.net like below:-

My App1:-

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My App2:-

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Now, Create a routing rule to route the URL's for both the Backend targets like below:-

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Refer my SO thread for more details.