langchain/tools/openapi/utils/openapi_utils.py/OpenAPISpec/_request_bodies_strict
class OpenAPISpec:    def _request_bodies_strict(self) -> Dict[str, Union[RequestBody, Reference]]:
        """Get the request body or err."""
        request_bodies = self._components_strict.requestBodies
        if request_bodies is None:
            raise ValueError("No request body found in spec. ")
        return request_bodies