CloudFront ( for DVA)
A Cache
- Demo : https://www.udemy.com/course/aws-certified-developer-associate-dva-c01/learn/lecture/36528154#overview
- objects with CacheKey
- default cachekey
- hostname + resourcePortion
- while hitting origin, it will drop query param as shown.
1. Cache Policy
- to set TTL
- to refine caching key and object.
- while hitting origin, include below which are coming in request.
- HTTP Headers: None – Whitelist
- Cookies: None – Whitelist – Include All-Except – All
- Query Strings: None – Whitelist – Include All-Except – All
- further enhance it before forwarding to origin.
- use Origin request policy. next
2. Origin-request policy
- before hitting origin, can modify http request.
- eg add additional : (not come as part of original req)
- HTTP Headers
- Cookies
- Query Strings
- Note: but cacheKey will be remain as per Cache Policy, (NOt on Origin request policy)
B. Cache behavior
- behaviour-1 for path pattern : /s3/* ==> origin-1 (s3) : cache-policy-1, Origin-request-policy-1, ...
- behaviour-2 for path pattern : /alb-1/* ==> origin-2 (alb): cache-policy-2, Origin-request-policy-2, ...
- behaviour-default for path pattern : /* ==> origin-1/2 (?): cache-policy-3, Origin-request-policy-3, ...
- ...
C. Invalidate cache
- distribution > invalidation tab
- create invalidation
