GitHub and Fastly having partial outage
I know GitHub uses Fastly so there might be a relationship. Personally seeing Fastly's endpoint API returning errors https://api.fastly.com/public-ip-list and Unicorns on cached GitHub pages like looking at code in the main branch.
GitHub: https://www.githubstatus.com/incidents/dlvf3sfmz7dm
Fastly: https://www.fastlystatus.com/? Looks like it's resolving now. I'm no longer seeing issues on either platform.