Solution:-
- Login to Azure Portal
- Open your Sitecore Azure App Service. Its name should be "mysitecoredev93-111111-single" or similar to this.
- Under Custom Domain, turn ON "HTTPS Only" mode.
Once it is done, now your http://www.example.com should redirect to https://www.example.com.
I hope this quick tip help you in Sitecore Azure App service deployment.