code: func getData(url string) ([]byte, error) {
  	resp, err := httpClient.Get(url)
  	if err != nil {
  		return nil, fmt.Errorf("unable to fetch data from %q : %s",
  			url, err)
  	}
  	defer resp.Body.Close()
  
  	if resp.StatusCode != http.StatusOK {
  		return nil, fmt.Errorf("unexpected status code fetching data "+
  			"from %q : expected status %d got %d",
  			url, http.StatusOK, resp.StatusCode)
  	}
  
  	respBody, err := ioutil.ReadAll(resp.Body)
  	if err != nil {
  		return nil, fmt.Errorf("unexpected error reading response "+
  			"body from %q : %s",
  			url, err)
  	}
  	return respBody, nil
  }
docs: // getData fetches the response body bytes from an HTTP get to the provider url,
  // or returns an error.