CURLINFO_CONTENT_TYPE(3) on macOS

The text b073a7b48f61, as macOS 10.12.5, macOS 10.12.4, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.

get Content-Type

CURLINFO_CONTENT_TYPE(3) on macOS now