code: func (api *API) CustomHostname(zoneID string, customHostnameID string) (CustomHostname, error) {
  	uri := "/zones/" + zoneID + "/custom_hostnames/" + customHostnameID
  	res, err := api.makeRequest("GET", uri, nil)
  	if err != nil {
  		return CustomHostname{}, errors.Wrap(err, errMakeRequestError)
  	}
  
  	var response CustomHostnameResponse
  	err = json.Unmarshal(res, &response)
  	if err != nil {
  		return CustomHostname{}, errors.Wrap(err, errUnmarshalError)
  	}
  
  	return response.Result, nil
  }
docs: // CustomHostname inspects the given custom hostname in the given zone.
  //
  // API reference: https://api.cloudflare.com/#custom-hostname-for-a-zone-custom-hostname-configuration-details