code: func ProtoHost(service, name string) (string, error) {
  	proto, err := Proto(service, name)
  	if err != nil {
  		return "", err
  	}
  	host, err := Host(service, name)
  	if err != nil {
  		return "", err
  	}
  
  	return fmt.Sprintf("%s://%s", proto, host), nil
  }
docs: // ProtoHost finds the specified proto:host combo for a service based off of the service's name and
  // which interface you are accessing. Values are found in environment variables fitting the scheme:
  // SERVICE_{SERVICE NAME}_{INTERFACE NAME}_{PROTO,HOST,PORT}.