1. This is a sample app created for demonstration certificate pinning in Android.
2. You can select pinned on unpinned mode from options menu
3. Unpinned mode allows all https urls as long as android OS trusts it (default behavior)
4. Pinned mode pins www.ssllabs.com public certificate. All other https calls will fail in this mode.
5. More details - http://opensourceforgeeks.blogspot.in/2016/06/certificate-pinning-in-android.html