Related to customer case TS019772124.
Internal issue https://github.ibm.com/AILifecycle/tracker/issues/7923

Go SDK core authenticators (e.g. CloudPakForDataAuthenticator) does not honor proxy settings from environment variables http_proxy or https_proxy. This happens when authenticator.DisableSSLVerification is set. In such cases custom http.Transport is constructed and its Proxy field is not initialized with http.ProxyFromEnvironment.