Flutter调试模式下HTTP请求无法解析www.xyz.app主机的问题

数据老陈

2026-7-1

Flutter调试模式下特定网络环境中HTTP POST请求DNS解析失败问题

问题现象

使用Flutter 3.1.3的HTTP包向https://www.xyz.app/api/login发起POST请求时，仅在调试模式下触发以下错误：

SocketException (SocketException: Failed host lookup: 'www.xyz.app' (OS Error: No address associated with hostname, errno = 7))

构建APK后请求可正常执行
调试模式下访问google.com等其他域名无异常
仅在特定网络环境中出现该问题，部分网络可正常运行

相关代码

async {
    try {
        final response = await http.post(
            Uri.parse('https://www.xyz.app/api/login'),
            body: {"mobile": phoneNumber, "password": password},
        );

        print(response);
        print(response.headers);
        print(response.statusCode);

        if (response.statusCode == 200) {
            // Successful login
            final Map<String, dynamic> responseData = json.decode(response.body);
            return responseData;
        } else {
            // Handle error cases
            throw Exception('Failed to login');
        }
    } catch (e) {
        print(e);
        throw Exception(e);
    }
}