AFNetworking失败情况下获取网络请求状态码

return [mng DELETE:urlString parameters:parameter success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
    [JKRNetwork networkSuccessWithTask:task success:success responseObject:responseObject];
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
    NSURLResponse *response = task.response;
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
    if ([[NSString stringWithFormat:@"%zd", httpResponse.statusCode] hasPrefix:@"2"]) {
        [JKRNetwork networkSuccessWithTask:task success:success responseObject:nil];
    } else {
        [JKRNetwork networkFailureWithTask:task failure:failure error:error];
    }
}];