Vr mode can't use in IOS 12.2

Questions
6

Safari on IOS 12.2:
https://www.babylonjs-playground.com/#GM1XMV#1
my project in playground,gyro is ok,
but my project in my server,
http://183.3.139.134:8886/
gyro is unuseful,
Safari < IOS12.2:
everything is ok