Hi David Levine,
Thanks for providing an update.!
Based on your comment, I understand you want to set up an app gateway to offload the SSL encryption. This could be great An app gateway is a service that acts as a reverse proxy to manage and route web traffic to backend applications, enhancing performance and security.
If you got an information as you mentioned document is got helpful and please let me know if you need any other help and assistance. The setup has been completed with that documentation means could you please accept the answer and give it an "upvote"? This would really help other community members who might be facing the same issue.
By accepting an answer, they can follow the same document it can reach to many members, allowing them to easily get come to a conclusion on this topic.