Otherwise CDN (Akamai) downloads file without the headers. The sequence
is following:
1. Ansible uploads file to CF.
2. Akamai downloads the file and caches it in CDN.
3. Ansible sets headers.
As a result Akamai serves file without headers.
This is backwards incompatible change, because headers keys are not
prefixed with `x-object-meta-`. Which allows user to set headers like
`Access-Control-Allow-Origin`.
