The github curl worked for me?

  curl -6  https://github.com -o /dev/null
    % Total    % Received % Xferd  Average Speed   Time      Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  100  273k    0  273k    0     0   957k      0 --:--:-- --:--:-- --:--:--  956k