I am using a MacBook air and I am unable to go to websites unless I specify http or https
My version is 10.10.5
Websites which automatically have https work like youtube.com and netflix.com
cnn.com does not work.
This might be because of your DNS. Simply try changing the DNS and it should work. Open Network settings and try changing your present DNS to Google Public DNS and it should get fixed.
Google Public DNS :