kubernetes/staging/src/k8s.io/client-go/rest/url_utils.go

// DefaultServerURL converts a host, host:port, or URL string to the default base server API path
// to use with a Client at a given API version following the standard conventions for a
// Kubernetes API.
func DefaultServerURL(host, apiPath string, groupVersion schema.GroupVersion, defaultTLS bool) (*url.URL, string, error) { … }

// DefaultVersionedAPIPath constructs the default path for the given group version, assuming the given
// API path, following the standard conventions of the Kubernetes API.
func DefaultVersionedAPIPath(apiPath string, groupVersion schema.GroupVersion) string { … }

// DefaultServerUrlFor is shared between IsConfigTransportTLS and RESTClientFor. It
// requires Host and Version to be set prior to being called.
func DefaultServerUrlFor(config *Config) (*url.URL, string, error) { … }