Callback The key that identifies the Path Item Object is a runtime expression that can be evaluated in the context of a runtime HTTP request/response to identify the URL to be used for the callback request.

OpenAPI is the root of an OpenAPI v3.1.0 document See https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.1.0.md.

The Header Object follows the structure of the Parameter Object with the following changes: 1.