deislabs/hippo#772 introduces API versioning for the server. The Hippo CLI can then check the api-supported-versions header to determine if the API it targets is supported or not. Alternatively we can send the Api-Version header to force Hippo to serve a specific version of the API. If it cannot server that version, then an error will be returned.

This will allow the CLI to inform the user if it is incompatible with the version of Hippo it is targeting.