Cache and CDN

CDN Mode

s3:
  use_presigned_url: false
  public_url_base: "https://cdn.example.com"
  path_scheme: "itemsadder/{uid}/{file}"

IAUP builds public_url_base/objectKey and does not prepend the bucket name.

Cache Busting

global:
  cache_bust:
    enabled: true
    param: "v"
    mode: "timestamp"

Modes:

• timestamp: current system milliseconds
• uuid: random UUID without dashes

Disable with enabled: false.

Presigned URL Mode

s3:
  use_presigned_url: true
  presigned_expiry_seconds: 86400

Presigned URLs keep the bucket private but expire, so they can be less stable for client caching.