layer.json， endpoint, is bad

CesiumJS
1

sometime, requestes is bad; Is it normal？

https://assets.cesium.com/1/layer.json

https://api.cesium.com/v1/assets/1/endpoint

2

I think this is the same question as here:

https://groups.google.com/forum/#!topic/cesium-dev/ipmx-w5tCiQ

I posted some questions there to help us debug this further.