code: func (api *API) ZoneRailgunDetails(zoneID, railgunID string) (ZoneRailgun, error) {
  	uri := "/zones/" + zoneID + "/railguns/" + railgunID
  	res, err := api.makeRequest("GET", uri, nil)
  	if err != nil {
  		return ZoneRailgun{}, errors.Wrap(err, errMakeRequestError)
  	}
  	var r zoneRailgunResponse
  	if err := json.Unmarshal(res, &r); err != nil {
  		return ZoneRailgun{}, errors.Wrap(err, errUnmarshalError)
  	}
  	return r.Result, nil
  }
docs: // ZoneRailgunDetails returns the configuration for a given Railgun.
  //
  // API reference: https://api.cloudflare.com/#railguns-for-a-zone-get-railgun-details