Amazon CloudFront 基础设施，Amazon CloudFront 中国边缘站点网络，目前共4个Points Of Presence (POP)
目前4个边缘站点分别是：北京、上海、中卫和深圳
在官网有详细的说明：https://www.amazonaws.cn/cloudfront/features/?nc1=h_ls
To deliver content to end users with lower latency, Amazon CloudFront China uses a network of 4 Points Of Presence (POP) in 4 cities across China.
CloudFront China currently has POPs in Beijing, Shanghai, Zhongwei, and Shenzhen, all of which are connected by the highly-resilient private backbone directly to Amazon Web Services China (Beijing) Region operated by Sinnet and Amazon Web Services China (Ningxia) Region operated by NWCD.