- (void)postPath:(NSString *)path
  parameters:(NSDictionary *)parameters
     success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
     failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure   
请问，我用这个方法网络成功后，怎样获取server返回的status code 。现在server有部分接口值返回状态码，没有responseObject。