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kubernetes/cmd/kubeadm/app/discovery/https/https.go 

// RetrieveValidatedConfigInfo connects to the API Server and makes sure it can talk
// securely to the API Server using the provided CA cert and
// optionally refreshes the cluster-info information from the cluster-info ConfigMap
func RetrieveValidatedConfigInfo(httpsURL string, discoveryTimeout time.Duration) (*clientcmdapi.Config, error) { … }