Exercise 3.1 frontalface.xml and eye.xml doesn't open

I am trying to do exercise 3.1, so i clicked the frontalface.xml and eye.xml in the description of exercise 3.1. But I get this kind of error which means github.com denied the connection.

Hello @김호석 ,

Please open these files in a new tab → right-click in the link and select “Open link in new tab”. It should work OK like this.