Can't clone repository by Cloud9

Tried to make example from https://markayoder.github.io/PRUCookbook/02start/start.html, but repository did not clone, so i get some commands from stackoverflow
and them did not help anyway:

debian@beaglebone:/var/lib/cloud9$ git clone https://github.com/MarkAYoder/PRUCookbook.git
Cloning into ‘PRUCookbook’…
fatal: unable to access ‘https://github.com/MarkAYoder/PRUCookbook.git/’: Could not resolve host: github.com
debian@beaglebone:/var/lib/cloud9$ git config --global --unset http.proxy
debian@beaglebone:/var/lib/cloud9$ git config --global --unset https.proxy
debian@beaglebone:/var/lib/cloud9$ git clone https://github.com/MarkAYoder/PRUCookbook.git
Cloning into ‘PRUCookbook’…
fatal: unable to access ‘https://github.com/MarkAYoder/PRUCookbook.git/’: Could not resolve host: github.com

debian@beaglebone:~$ git config --global http.proxy http://proxyuser:proxypwd@proxy.server.com:8080
debian@beaglebone:~$ git clone https://github.com/MarkAYoder/PRUCookbook.git
Cloning into ‘PRUCookbook’…
fatal: unable to access ‘https://github.com/MarkAYoder/PRUCookbook.git/’: Could not resolve proxy: proxy.server.com

The repository clones just fine. You have a networking problem, as you
can see the 'could not resolve host: github.com' lines.

I also do not think you should be setting a proxy if your network does
not need one, and if it does, then it has to be a real proxy instead of
the example 'proxy.server.com' that you have used.

So you need to fix the network on whatever device you are git cloning into

Is your desktop, windows, mac or linux.. you need to share your
network connection to the board if you don't have the ethernet jack
plugged in..

Regards,