https://www.openpolitics.com/links/cloudfront-cache-control-headers-missing/
Cloudfront cache-control headers missing
cache control headerscloudfrontmissing
https://modpagespeed.com/docs/cache-control/
Set Cache-Control headers — ModPageSpeed 2.0
Set the right Cache-Control headers on your origin for optimal caching with ModPageSpeed 2.0.
cache control headersset