https://daverupert.com/atom.xml
First, he sends it with a "content-type: application/xml" header. In contrast to most sites that send it with "content-type: application/atom+xml". Which seems to have the nice effect that it renders in Firefox instead of opening the usual "What should Firefox do with this file?" popup.
Secondly, he provides this nice header text "Yahaha, you found me! This is my RSS feed.". It seems to be fetched via this part of the code:
Pretty nice. Are those best practices? Or will "content-type: application/xml" mess with users who have a native feed reader installed and expect the reader to kick in when they click on a feed url?