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application/yaml

YAML text. Registered in 2024; before that, servers sent unregistered names.

Extensions: .yaml .yml
Header: Content-Type: application/yaml
Registered: Yes, in the IANA media type registry.
References: IANA · RFC 9512

What servers send

The type each server's own mime.types gives these extensions, as it ships.

Extension	Apache httpd 2.4.69	nginx 1.31.6
.yaml	Not listed	Not listed
.yml	Not listed	Not listed

The IANA registry also gives these extensions to application/asyncapi+json, application/asyncapi+yaml, application/vnd.oai.workflows and application/vnd.oai.workflows+yaml.

Common application types

Every media type, in one table