A GET operation to https://<host>:<port>/v9/ will return a simple HTML page that lists all supported REST API server operations and the parameters they take.
curl -k -H \"X-Api-Key:sample-api-key\" https://10.20.30.40:8444/v9/
Or, for more detailed information about the supported API calls, the parameters they take, and the expected responses, a JSON formatted OpenAPI specification document can be generated using the following command:
curl -k -H \"X-Api-Key:sample-api-key\"
https://10.20.30.40:8444/v9/storage/openapi/openapi.json \> openapi.json
The JSON file produced can be loaded into third party tools and used to view the documentation, along with examples, or client code can be automatically generated in various different languages.