Github has had problems for 24 hours or so. Yesterday I was getting "secondary rate limit" errors. Just now I followed a link to a github repository which displayed correctly. Clicking on a source file to view the contents got a generic error message. Reloading the page then got the secondary rate limit error.

It seems like GitHub is experiencing some kind of issue that's causing the servers to be down.

Down for me.

Seems to be working for me.

yes