Testing cache-control directives with Azure Front Door cache

How to test that origin services are responding with the correct cache-control headers that act as directives for Azure Front Door cache. This is a companion to the blog "How Azure Front Door cache can help protect against DDoS attacks" https://techcommunity.microsoft.com/t5/fasttrack-for-azure/how-azure-front-door-cache-can-help-protect-against-ddos-attacks/ba-p/3703272 This is an Azure Lunch video by Daniel Larsen, Principal Customer Experience Engineer at Microsoft. I work for Microsoft, but opinions are my own. This video is provided "AS-IS," WITHOUT WARRANTY OF ANY KIND. Microsoft disclaims all express, implied or statutory warranties, including warranties of quality, title, non-infringement, merchantability and fitness for a particular purpose.