Looks like a larger one than usual: <a href="https://www.githubstatus.com/incidents/t2xwk9mz56f4" rel="nofollow">https://www.githubstatus.com/incidents/t2xwk9mz56f4</a>
<a href="https://www.githubstatus.com/incidents/t2xwk9mz56f4" rel="nofollow">https://www.githubstatus.com/incidents/t2xwk9mz56f4</a> should be the URL
requests using the "_gh_sess" cookie are failing. If you can remove that cookie, request will work. Of course that means you cant make any authenticated requests, but its a workaround.