ios 的上架时被退回两次，信息中写的是因为 IPv6 的支持问题，具体内容如下：
Upon further review of your application, we found the following issue to be unresolved. We discovered one or more bugs in your app when reviewed on iPad running iOS 9.3.2 and iPhone running iOS 9.3.2 on Wi-Fi. Specifically, your app displayed an error message when logging in with the provided demo account. Next Steps Please run your app on a device to identify the issue(s), then revise and resubmit your app for review. Apps are reviewed on an IPv6 network. Please ensure that your app supports IPv6 networks, as IPv6 compatibility is required. For additional information about supporting IPv6 Networks, please refer to Supporting IPv6 DNS64/NAT64 Networks. For a networking overview, see About Networking. 我们调用接口是用的域名，自己测试也没法重现失败的情况，请问这个应该怎么重现，代码上应该怎么处理呢，谢谢各位
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