The Cache-Control header of cdn.dl.k8s.io contains 'no-store', disabling caching completely.

[ysiw]

$ curl --head https://cdn.dl.k8s.io/release/v1.30.0/kubernetes-server-linux-amd64.tar.gz
HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 376899698
Content-Type: application/x-tar
Last-Modified: Wed, 17 Apr 2024 21:23:20 GMT
ETag: "7cf058a841717952027d751c6fd7adaf"
Accept-Ranges: bytes
Age: 79750
Date: Sat, 31 May 2025 11:49:33 GMT
Cache-Control: private, no-store
access-control-allow-origin: *

[BenTheElder]

cc @ameukam

[BenTheElder]

/sig k8s-infra

[ameukam]

we don't cache the HEAD requests to at the edge network per recommendation of the CDN provider and to avoid unnecessary caching.

[BenTheElder]

I think the issue is the header is being reflected from the edge to the client, but the client should be allowed to cache?

It makes sense to set this between the edge and backend as needed, but the edge should probably not prohibit the client caching.

[BenTheElder]

/kind bug