# HTTPDNS Flutter SDK (SNI Hidden v1.0.0)

## 1. Initialization

```dart
import 'package:new_httpdns/new_httpdns.dart';

await NewHttpdns.init(
  appId: 'app1f1ndpo9',
  primaryServiceHost: 'httpdns-a.example.com',
  backupServiceHost: 'httpdns-b.example.com', // optional
  servicePort: 443,
  secretKey: 'your-sign-secret', // optional if sign is enabled
);

await NewHttpdns.setHttpsRequestEnabled(true);
await NewHttpdns.build();
```

## 2. Resolve

```dart
final result = await NewHttpdns.resolveHostSyncNonBlocking(
  'api.business.com',
  ipType: 'both',
);

final ipv4 = result['ipv4'] ?? <String>[];
final ipv6 = result['ipv6'] ?? <String>[];
```

## 3. Official HTTP Adapter (IP + Host)

```dart
final adapter = NewHttpdns.createHttpAdapter(
  options: const NewHttpdnsAdapterOptions(
    ipType: 'auto',
    connectTimeoutMs: 3000,
    readTimeoutMs: 5000,
    allowInsecureCertificatesForDebugOnly: false,
  ),
);

final resp = await adapter.request(
  Uri.parse('https://api.business.com/v1/ping'),
  method: 'GET',
  headers: {'Accept': 'application/json'},
);

print(resp.statusCode);
print(resp.usedIp);
```

Behavior is fixed:
- Resolve host by `/resolve`.
- Connect to resolved IP over HTTPS.
- Keep `Host` header as the real business domain.
- No fallback to domain direct request.

## 4. Public Errors

- `NO_IP_AVAILABLE`
- `TLS_EMPTY_SNI_FAILED`
- `HOST_ROUTE_REJECTED`
- `RESOLVE_SIGN_INVALID`

## 5. Deprecated Params Removed

The public init API no longer accepts:
- `accountId`
- `serviceDomain`
- `endpoint`
- `aesSecretKey`