cloudfront s3 设置缓存策略

1、为什么 Amazon CloudFront 不按我指定的时间长度缓存文件？

https://aws.amazon.com/cn/premiumsupport/knowledge-center/cloudfront-cache-files-time/

2、Amazon CloudFront 缓存策略（过期时间）

https://docs.aws.amazon.com/zh_cn/AmazonCloudFront/latest/DeveloperGuide/Expiration.html#ExpirationDownloadDist

3、aws s3设置缓存时间

https://docs.aws.amazon.com/zh_cn/AmazonCloudFront/latest/DeveloperGuide/Expiration.html 

Cache-Control: max-age=86400, s-maxage=3600