Can not catch cancellation exception

[tom-xy]

Package

dio

Version

5.3.3

Operating-System

MacOS

Output of flutter doctor -v

[✓] Flutter (Channel stable, 3.13.9, on macOS 14.1.1 23B81 darwin-arm64, locale zh-Hans-CN)
    • Flutter version 3.13.9 on channel stable at /Users/tom/Library/Flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision d211f42860 (2 weeks ago), 2023-10-25 13:42:25 -0700
    • Engine revision 0545f8705d
    • Dart version 3.1.5
    • DevTools version 2.25.0

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
    • Android SDK at /Users/tom/Library/Android/sdk
    • Platform android-33, build-tools 33.0.2
    • ANDROID_HOME = /Users/tom/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
    • All Android licenses accepted.

[!] Xcode - develop for iOS and macOS (Xcode 15.0)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15A240d
    ✗ Unable to get list of installed Simulator runtimes.
    • CocoaPods version 1.12.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)

[✓] VS Code (version 1.84.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.76.0

[✓] Connected device (3 available)
    • Pixel 4 (mobile) • 98111FFAZ000UV • android-arm64  • Android 13 (API 33)
    • macOS (desktop)  • macos          • darwin-arm64   • macOS 14.1.1 23B81 darwin-arm64
    • Chrome (web)     • chrome         • web-javascript • Google Chrome 119.0.6045.123

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.

Dart Version

No response

Steps to Reproduce

import 'package:dio/dio.dart';
import 'package:path/path.dart' as p;
import 'dart:io';

// https://pub.dev/packages/dio#cancellation

final cancelToken = CancelToken();

void main(List<String> arguments) async {
  download();
  Future.delayed(Duration(seconds: 2)).then((value) {
    cancel();
  });
}

download() async {
  final dio = Dio();
  final url = "https://www.example.com/picture.png"; // For example
  final savePath = p.join(Directory.current.path, "picture.png");

  try {
    await dio.downloadUri(
      Uri.parse(url),
      savePath,
      cancelToken: cancelToken,
      onReceiveProgress: (int count, int total) async {
        print("Received $count, Total received: $total");
      },
    );
  } catch (e) {
    print("Error: $e");
  }
}

cancel() {
  try {
    cancelToken.cancel(); // Not an async method
  } catch (e) {
    print("$e");
  }
}

Expected Result

Cancellation exception caught

Actual Result

Cancellation exception not caught

[AlexV525]

Duplicate of #1869