DigitalOcean Spaces has a limited support for headers https://docs.digitalocean.com/products/spaces/how-to/set-file-metadata/ allowing any custom header start with x-amz-meta-

This creates incompatibility with Cloudflare Cache-Tag, see https://developers.cloudflare.com/cache/how-to/purge-cache/#add-cache-tag-http-response-headers not allowing to add header "Cache-Tag".

Why there even is such limitation, why not to allow to add any header...

Also why it would add headers x-amz-request-id, X-HW, x-rgw-object-type without our concern, please remove it.