ResponseType.stream is not working on web.

[mrsrmn]

Package

dio

Version

5.4.3+1

Operating-System

Web

Adapter

Default Dio

Output of flutter doctor -v

[✓] Flutter (Channel stable, 3.22.2, on macOS 14.5 23F79
    darwin-arm64, locale tr-TR)
    • Flutter version 3.22.2 on channel stable at
      /Users/emirs/Downloads/flutter
    • Upstream repository
      https://github.com/flutter/flutter.git
    • Framework revision 761747bfc5 (3 weeks ago), 2024-06-05
      22:15:13 +0200
    • Engine revision edd8546116
    • Dart version 3.4.3
    • DevTools version 2.34.3

[✓] Android toolchain - develop for Android devices (Android
    SDK version 34.0.0)
    • Android SDK at /Users/emirs/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: /Users/emirs/Applications/Android
      Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      17.0.10+0-17.0.10b1087.21-11609105)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15F31d
    • CocoaPods version 1.13.0

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

[✓] Android Studio (version 2024.1)
    • Android Studio at /Users/emirs/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
      17.0.10+0-17.0.10b1087.21-11609105)

[✓] IntelliJ IDEA Ultimate Edition (version 2024.1.3)
    • IntelliJ at /Users/emirs/Applications/IntelliJ IDEA
      Ultimate.app
    • 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

[✓] Connected device (4 available)
    • Emir’s iPhone (mobile)          •
      00008101-000A58240A98001E • ios            • iOS 17.5.1
      21F90
    • macOS (desktop)                 • macos
      • darwin-arm64   • macOS 14.5 23F79 darwin-arm64
    • Mac Designed for iPad (desktop) • mac-designed-for-ipad
      • darwin         • macOS 14.5 23F79 darwin-arm64
    • Chrome (web)                    • chrome
      • web-javascript • Google Chrome 126.0.6478.63

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

• No issues found!

Dart Version

3.4.3

Steps to Reproduce

1. simply create a POST request with the responseType set as ResponseType.stream

Expected Result

return the stream, as it does on other platforms.

Actual Result

instead of a stream, it directly gives the response body as one when the stream finishes.

[AlexV525]

Streaming response is unavailable on the Web platform with XHR-based implementations. dart-lang/http#593