Cannot connect to server on Flutter web

[juliusarden]

ddpClient.connect() cannot be run on the web.

...
  onPressed: () {
      DdpClient client =
          DdpClient(xxx, xxx, xxx);
      client.connect(); // Died on this line
  },

This code works fine on mobile (IOS and Android), it does not work for web.
Here is the error message:

══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
js_primitives.dart:30 The following UnsupportedError was thrown while handling a gesture:
js_primitives.dart:30 Unsupported operation: Platform._version
js_primitives.dart:30 
js_primitives.dart:30 When the exception was thrown, this was the stack:
js_primitives.dart:30 package:dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 194:49  throw_
js_primitives.dart:30 package:dart-sdk/lib/_internal/js_dev_runtime/patch/io_patch.dart 284:5               _version
js_primitives.dart:30 package:dart-sdk/lib/io/platform_impl.dart 121:32                                     get version
js_primitives.dart:30 package:dart-sdk/lib/io/platform.dart 74:37                                           get _version
js_primitives.dart:30 package:dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/utils.dart 75:6     get
js_primitives.dart:30 package:dart-sdk/lib/io/platform.dart 231:32                                          get version
js_primitives.dart:30 package:dart-sdk/lib/_http/http_impl.dart 3234:26                                     _getHttpVersion
js_primitives.dart:30 package:dart-sdk/lib/_http/http_impl.dart 2071:22                                     new
js_primitives.dart:30 package:dart-sdk/lib/_http/http.dart 1473:18                                          new
js_primitives.dart:30 package:dart-sdk/lib/_http/websocket_impl.dart 993:45                                 get _httpClient
js_primitives.dart:30 package:dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/utils.dart 75:6     get
js_primitives.dart:30 package:dart-sdk/lib/_http/websocket_impl.dart 1046:8                                 connect
js_primitives.dart:30 package:dart-sdk/lib/_http/websocket.dart 380:22                                      connect
js_primitives.dart:30 package:ddp/ddp_client.dart 137:8                                                     connect
...