Media type of yaml is not like described in RFC 9512

[true-false-maybe]

As of February 14th 2024, RFC 9512opens in a new tab formally registers application/yaml as the media type for all YAML content, and adds +yaml as a standard structured suffix for all YAML-based more specific media types. With this registration, it's now included in the official media types listopens in a new tab maintained by the IANA.

While a few applications have been using application/yaml and +yaml like this already, many haven't (e.g. Rails still usesopens in a new tab application/x-yaml, and others like text/yaml and even text/x-yaml are frequently seen in the wild) and there's never been clear agreement on exactly how this should work. Hopefully with this RFC we'll be able to start picking a single media type consistently from now on, though updating older applications here will obviously take some time.

source https://httptoolkit.com/blog/yaml-media-type-rfc/

currently the code uses application/x-yaml