I've changed this blog's protocol to HTTPS. If you use a feed reader, please update your feed reader's URL for this site. The new one is mostly the same, but uses HTTPS: https://david.dlma.com/blog/atom/1.
Whenever I have to change a feed URL, I either redirect from the old one, or when I can't, I leave a message like this as the last message on the old feel URL.
I had to do this once before, in 2012. Here's a mention of practicing good feed hygiene back then, too.