create method
Creates a firewall rule for the application.
request - The metadata request object.
Request parameters:
appsId - Part of parent. Name of the parent Firewall collection in
which to create a new rule. Example: apps/myapp/firewall/ingressRules.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a FirewallRule.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<FirewallRule> create(
  FirewallRule request,
  core.String appsId, {
  core.String? $fields,
}) async {
  final body_ = convert.json.encode(request);
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'v1/apps/' +
      commons.escapeVariable('$appsId') +
      '/firewall/ingressRules';
  final response_ = await _requester.request(
    url_,
    'POST',
    body: body_,
    queryParams: queryParams_,
  );
  return FirewallRule.fromJson(
      response_ as core.Map<core.String, core.dynamic>);
}