code: func lookupProject() (string, error) {
  	req, err := http.NewRequest("GET", "http://metadata.google.internal/computeMetadata/v1/project/project-id", nil)
  	if err != nil {
  		return "", err
  	}
  	req.Header.Add("Metadata-Flavor", "Google")
  
  	resp, err := http.DefaultClient.Do(req)
  	if err != nil {
  		return "", err
  	}
  	defer resp.Body.Close()
  
  	if resp.StatusCode != 200 {
  		return "", fmt.Errorf("discover-gce: invalid status code %d when fetching project id", resp.StatusCode)
  	}
  
  	project, err := ioutil.ReadAll(resp.Body)
  	if err != nil {
  		return "", err
  	}
  	return string(project), nil
  }
docs: // lookupProject retrieves the project name from the metadata of the current node.