带阿里标识的版本

EdgeUser/web/views/@default/httpdns/apps/docs/flutter.md

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+# Flutter SDK
+
+## 初始化
+
+```dart
+await AliyunHttpdns.init(
+  appId: 'app1f1ndpo9',
+  primaryServiceHost: 'httpdns-a.example.com',
+  backupServiceHost: 'httpdns-b.example.com',
+  servicePort: 443,
+  secretKey: 'your-sign-secret',
+);
+await AliyunHttpdns.build();
+```
+
+## 解析
+
+```dart
+final result = await AliyunHttpdns.resolveHostSyncNonBlocking(
+  'api.business.com',
+  ipType: 'both',
+);
+```
+
+## 官方业务适配器
+
+```dart
+final adapter = AliyunHttpdns.createHttpAdapter();
+final resp = await adapter.request(
+  Uri.parse('https://api.business.com/v1/ping'),
+  method: 'GET',
+);
+```
+
+固定策略：IP 直连 + 空 SNI + Host=真实域名，不回退到带 SNI。