It seems like HTTP requests these days, generally, don't come with a referer header? It's a shame in a way because if something you wrote is getting a lot of hits you can't tell where they're coming from.
@d23fc1b0 Huh! I checked my recent logs and see 83% with no referer.
Sounds like this is the root of the missing referer headers. https://developer.chrome.com/blog/referrer-policy-new-chrome-default/