fetch method
Fetches the request
and returns the Response
Implementation
Future<Response> fetch(dynamic /*Request|String*/ request,
[RequestInit? requestInit]) {
List args = [_wrapRequest(request)];
if (requestInit != null) {
args.add(requestInit);
}
return promiseToFuture<Object, Response>(
_callMethod(_delegate, 'fetch', args), Response._);
}