web link doesn't load outside the main window

I need to use the apis in these samples:

http://ift.tt/1zwDgqM

when I open any of them by clicking or opening in a new window they work. They even work when I open them from the "view source" of the link I posted, so there is no collateral javascript/css code needed. And it let's me do it as many times as I want

But when I copy and paste the link of a sample in any browser I get empty result.

I also get empty result when I download a link to a String in c#:

String res = new System.Net.WebClient().DownloadString("http://ift.tt/1yGCEnC");

I don't understand why....