正常抓是不走代理的，需要给dio对象配置代理：
Dio dio = Dio();
(dio.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate = (HttpClient client) {
client.findProxy = (uri) {
return "PROXY localhost:8888";
};
};
localhost mac电脑可以用ifconfig命令看，或者直接在Charles——>Help——>Local IP Address
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