I'm getting
404s for a lot, possibly all things coming from
https://raw.githubusercontent.com/ in general at the moment.
Didn't check everything I have used recently but thigs I know worked came back 404.
Could be a local caching server / front end issue for them or they broke something big.
Edit: see below, they are not supposed to be there. BUT my comment is still valid.
This IS working from some places (home) but not others (office).
https://raw.githubusercontent.com/nginxinc/docker-nginx/1.16.0/stable/stretch/DockerfileHowever, I didn't notice it's not a 404 but
400 error that I am getting from the work PC.
So 2 different issues that with a quick glance look the same.
-Dave