# HTTPDNS iOS SDK (SNI Hidden v1.0.0)

## 1. Init

```objc
#import <TrustHTTPDNS/TrustHTTPDNS.h>

HttpdnsEdgeService *service = [[HttpdnsEdgeService alloc]
    initWithAppId:@"app1f1ndpo9"
primaryServiceHost:@"httpdns-a.example.com"
 backupServiceHost:@"httpdns-b.example.com"
        servicePort:443
         signSecret:@"your-sign-secret"]; // optional if sign is enabled
```

## 2. Resolve

```objc
[service resolveHost:@"api.business.com" queryType:@"A" completion:^(HttpdnsEdgeResolveResult * _Nullable result, NSError * _Nullable error) {
    if (error != nil) {
        return;
    }
    NSLog(@"requestId=%@ ipv4=%@ ipv6=%@ ttl=%ld", result.requestId, result.ipv4s, result.ipv6s, (long)result.ttl);
}];
```

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

```objc
NSURL *url = [NSURL URLWithString:@"https://api.business.com/v1/ping"];
[service requestURL:url method:@"GET" headers:@{@"Accept": @"application/json"} body:nil completion:^(NSData * _Nullable data, NSHTTPURLResponse * _Nullable response, NSError * _Nullable error) {
    if (error != nil) {
        return;
    }
    NSLog(@"status=%ld", (long)response.statusCode);
}];
```

Behavior is fixed:
- Resolve by `/resolve`.
- Connect to resolved IP over HTTPS.
- Keep `Host` header as 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. Removed Public Params

Do not expose legacy public parameters:
- `accountId`
- `serviceDomain`
- `endpoint`
- `aesSecretKey`