add task manager

lib/utils/websocket.dart

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+export './websocket_io.dart' if (dart.library.html) './websocket_web.dart';

lib/utils/websocket_io.dart

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+import 'package:web_socket_channel/io.dart';
+import 'package:web_socket_channel/web_socket_channel.dart';
+import '../globals.dart';
+
+Future<WebSocketChannel> connectWebSocket(Uri uri) async {
+  final Map<String, String> headers = {};
+  final jar = cookieJar;
+  if (jar != null) {
+    final nuri =Uri(
+      scheme: uri.scheme == "wss" ? "https" : "http",
+      userInfo: uri.userInfo,
+      host: uri.host,
+      port: uri.port,
+      path: uri.path,
+      query: uri.query,
+    );
+    final cookies = await jar.loadForRequest(nuri);
+    final list = <String>[];
+    for (var cookie in cookies) {
+      list.add('${cookie.name}=${cookie.value}');
+    }
+    headers['cookie'] = list.join('; ');
+  }
+  return IOWebSocketChannel.connect(uri, headers: headers);
+}

lib/utils/websocket_web.dart

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+import 'package:web_socket_channel/html.dart';
+import 'package:web_socket_channel/web_socket_channel.dart';
+
+Future<WebSocketChannel> connectWebSocket(Uri uri) async {
+  return HtmlWebSocketChannel.connect(uri, binaryType: BinaryType.list);
+}