please help me, how to analyze this response message body?

HTTP/1.1 200 OK Cache-Control: private Content-Type: text/plain; charset=utf-8 Vary: Accept-Encoding Server: Microsoft-IIS/7.5 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Wed, 28 Jun 2017 08:51:55 GMT Content-Length: 48

AAABAAAAAQAAAAEAAAABAAAABQcAOTQ3NzE4OajJOxYAAAAA

access http://ift.tt/2uk5Rns, get this response message,next acess http://ift.tt/2tmUXjI. I don't know how to analyze 'AAABAAAAAQAAAAEAAAABAAAABQcAOTQ3NzE4OajJOxYAAAAA'