application/toml

TOML's registered type, pointing at a spec that lives at toml.io rather than in an RFC — the IANA registration cites TOML v1.0.0 directly. You will rarely meet it over HTTP; TOML's natural habitat is configuration read straight from disk, from Cargo.toml to pyproject.toml. When it does travel, the spec keeps things simple: a TOML document is UTF-8 by definition, so there is no charset negotiation to get wrong.

Defined by TOML v1.0.0 · IANA registration. Registry facts from the IANA media-types registry via mime-db.