UrlConnection class abstract

Represents a communication link between the application and a Url.

This class serves as the base abstraction for different types of connections (e.g., HTTP, FTP). Concrete subclasses are expected to implement protocol-specific connection logic in the connect method.

Once connected, the UrlConnection provides access to the request and response objects, and allows obtaining an input stream for reading the response body.

Example

class HttpUrlConnection extends UrlConnection {
  HttpUrlConnection(Url url) : super(url);

  @override
  Future<void> connect() async {
    final client = HttpClient();
    final req = await client.getUrl(Uri.parse(url.toString()));
    _setRequest(req);
    _setResponse(await req.close());
  }
}

final connection = HttpUrlConnection(Url.parse('https://example.com'));
await connection.connect();
final stream = connection.getInputStream();
int byte;
while ((byte = await stream.readByte()) != -1) {
  print(byte);
}