# cloudfront
## CachingOptimized

## CachingOptimizedForUncompressedObjects
最小化緩存中的值來優化緩存的效率，不包含查詢字符(不管你給他甚麼東西，他都給你同一個值)、標題或cookie，與上一個差不多，但它禁用緩存壓縮

Policy settings

Minimum TTL: 1 second

Maximum TTL: 31,536,000 seconds (365 days)

Default TTL: 86,400 seconds (24 hours)

Headers included in the cache key: None
## CachingDisabled
禁用緩存，對於動態內容與不可緩存很有效

Policy settings

Minimum TTL: 0 seconds

Maximum TTL: 0 seconds

Default TTL: 0 seconds

Headers included in the cache key: None
## Elemental-MediaPackage
just for AWS Elemental MediaPackage

Minimum TTL: 0 seconds

Maximum TTL: 31,536,000 seconds (365 days)

Default TTL: 86,400 seconds (24 hours)

Headers included in the cache key:

Origin
## Amplify
just for Amplify

Policy settings

Minimum TTL: 2 seconds

Maximum TTL: 600 seconds (10 minutes)

Default TTL: 2 seconds

Headers included in cache key:

Authorization

CloudFront-Viewer-Country

Host
###### tags: `許良宏`