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Once published, you can try calling your API - see Try out API.
You can always retrieve the openapi spec from a client, by calling the base url with a GET request and adding ?openapi.json or ?swagger.json (if the API is a WSDL, you must use ?wsdl instead) - with the above example, https://test.ceptor.io:8443/example/1?openapi.json will return the OpenAPI Spec modified to include the correct security settings and hostname for the appropriate environment.