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A macOS/iOS Flutter plugin that provides access to the
[Foundation URL Loading System][].

## Motivation

Using the [Foundation URL Loading System][], rather than the socket-based
[dart:io HttpClient][] implemententation, has several advantages:

1. It automatically supports iOS/macOS platform features such VPNs and HTTP
   proxies. 
2. It supports many more configuration options such as only allowing access
   through WiFi and blocking cookies.
3. It supports more HTTP features such as HTTP/3 and custom redirect handling.

## Using

The easiest way to use this library is via the the high-level interface
defined by [package:http Client][].

This approach allows the same HTTP code to be used on all platforms, while
still allowing platform-specific setup.

```dart
late Client client;
if (Platform.isIOS) {
  final config = URLSessionConfiguration.ephemeralSessionConfiguration()
    ..allowsCellularAccess = false
    ..allowsConstrainedNetworkAccess = false
    ..allowsExpensiveNetworkAccess = false;
  client = CupertinoClient.fromSessionConfiguration(config);
} else {
  client = IOClient(); // Uses an HTTP client based on dart:io
}

final response = await client.get(Uri.https(
    'www.googleapis.com',
    '/books/v1/volumes',
    {'q': 'HTTP', 'maxResults': '40', 'printType': 'books'}));
```

[package:http runWithClient][] can be used to configure the
[package:http Client][] for the entire application.

```dart
void main() {
  late Client client;
  if (Platform.isIOS) {
    client = CupertinoClient.defaultSessionConfiguration();
  } else {
    client = IOClient();
  }

  runWithClient(() => runApp(const MyApp()), () => client);
}

...

class MainPageState extends State<MainPage> {
  void someMethod() {
    // Will use the Client configured in main.
    final response = await get(Uri.https(
        'www.googleapis.com',
        '/books/v1/volumes',
        {'q': 'HTTP', 'maxResults': '40', 'printType': 'books'}));
  }
  ...
}
```

You can also use the [Foundation URL Loading System] API directly.

```dart
final url = Uri.https(
    'www.googleapis.com',
    '/books/v1/volumes',
    {'q': 'HTTP', 'maxResults': '40', 'printType': 'books'});
final session = URLSession.sharedSession();
final task = session.dataTaskWithCompletionHandler(URLRequest.fromUrl(url),
    (data, response, error) {
  if (error == null && response!.statusCode == 200) {
    print(data!.bytes);
  }
});
task.resume();
```

[package:http Client]: https://pub.dev/documentation/http/latest/http/Client-class.html
[package:http runWithClient]: https://pub.dev/documentation/http/latest/http/runWithClient.html
[Foundation URL Loading System]: https://developer.apple.com/documentation/foundation/url_loading_system
[dart:io HttpClient]: https://api.dart.dev/stable/dart-io/HttpClient-class.html