application/yaml

YAML went twenty years without a registered type, so the wild is full of inventions — text/yaml, application/x-yaml, text/x-yaml — none of them standard. RFC 9512 finally settled it in 2024: application/yaml, plus a +yaml suffix for derived types. If your API or config service emits YAML, this is the label, and the x- variants persist only as folklore. UTF-8, like every YAML stream.

mime-db doesn't map .yaml or .yml to this type yet, so servers usually need the mapping configured by hand.

Defined by RFC 9512 · IANA registration. Registry facts from the IANA media-types registry via mime-db.