code: func (c *Client) CreateFirewallRule(ruleOptions *FirewallRuleOptions) (*FirewallRule, error) {
  	rule := new(FirewallRule)
  	_, err := c.MakeApiRequest("POST", "/1.0/firewall_rules", ruleOptions, &rule)
  	if err != nil {
  		return nil, err
  	}
  	return rule, nil
  }
docs: // CreateFirewallRule creates a new firewall rule.
  //
  // It takes a FirewallRuleOptions struct for specifying name and other
  // attributes. Not all attributes can be specified at create time
  // (such as Id, which is allocated for you)