Bug：HttpException: Connection closed before full header was received

[Clearlove2015]

Package

dio

Version

5.7.0

Operating-System

Windows

Adapter

Default Dio

Output of flutter doctor -v

[√] Flutter (Channel stable, 3.29.0, on Microsoft Windows [版本 10.0.26100.4061], locale zh-CN) [622ms]
    • Flutter version 3.29.0 on channel stable at D:\Flutter\Android\flutter-sdk\flutter_windows_3.29.0-stable
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 35c388afb5 (4 months ago), 2025-02-10 12:48:41 -0800
    • Engine revision f73bfc4522
    • Dart version 3.7.0
    • DevTools version 2.42.2

[√] Windows Version (Windows 11 or higher, 24H2, 2009) [2.9s]

[√] Android toolchain - develop for Android devices (Android SDK version 35.0.1) [3.8s]
    • Android SDK at D:\Flutter\Android\android-sdk
    • Platform android-36, build-tools 35.0.1
    • ANDROID_HOME = D:\Flutter\Android\android-sdk
    • Java binary at: D:\Flutter\Android\android-studio-narwhal-canary10\jbr\bin\java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13391695-b895.109)
    • All Android licenses accepted.

[√] Chrome - develop for the web [171ms]
    • Chrome at C:\Users\Flutter\AppData\Local\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.13.7) [170ms]
    • Visual Studio at D:\Flutter\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.13.36105.23
    • Windows 10 SDK version 10.0.22621.0

[√] Android Studio (version 2024.3.2) [29ms]
    • Android Studio at D:\Flutter\Android\android-studio-meerkat-feature-drop-canary3
    • 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 21.0.5+-12932927-b750.29)

[√] Android Studio (version 2025.1.1) [27ms]
    • Android Studio at D:\Flutter\Android\android-studio-narwhal-canary10
    • 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 21.0.6+-13391695-b895.109)

[√] Connected device (3 available) [197ms]
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [版本 10.0.26100.4061]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 136.0.7103.93
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 136.0.3240.92

[√] Network resources [607ms]
    • All expected network resources are available.

• No issues found!

Dart Version

3.7.0

Steps to Reproduce

首先，感谢杜文及CFUG各位成员的贡献。 我看这个Bug出现了很长时间，但是都没有得到解决，期望这个问题得到解决。

我查看了已有Issues，也没看到好的解决方案 https://github.com/cfug/dio/issues?q=is%3Aissue%20state%3Aclosed%20HttpException%3A%20Connection%20closed%20before%20full%20header%20was%20received

重现场景：我的应用类似应用宝多任务下载文件，同时执行多个下载任务时，会出现这个报错：HttpException: Connection closed before full header was received，从而导致下载失败。

我这打印出来的报错是这样：DioExceptionType.unknown HttpException: Connection closed before full header was received

Expected Result

正常下载，不会报错导致下载失败

Actual Result

报错：HttpException: Connection closed before full header was received，然后下载失败

[pdong15dth]

I am experiencing a similar issue, but with a much higher frequency. The Crashlytics dashboard has recorded over 75,000 occurrences related to this problem.

Output of flutter doctor -v

[√] Flutter (Channel stable, 3.29.3, on Microsoft Windows [Version 10.0.26100.4351], locale en-US) [462ms]
    • Flutter version 3.29.3 on channel stable at C:\Users\pdong\dev\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision ea121f8859 (3 months ago), 2025-04-11 19:10:07 +0000
    • Engine revision cf56914b32
    • Dart version 3.7.2
    • DevTools version 2.42.3

[√] Windows Version (Windows 11 or higher, 24H2, 2009) [2.2s]

[√] Android toolchain - develop for Android devices (Android SDK version 35.0.1) [5.5s]
    • Android SDK at C:\Users\pdong\AppData\Local\Android\sdk
    • Platform android-35, build-tools 35.0.1
    • Java binary at: C:\Users\pdong\AppData\Local\Programs\Android Studio\jbr\bin\java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13368085-b895.109)
    • All Android licenses accepted.

[√] Chrome - develop for the web [163ms]
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop Windows apps (Visual Studio Professional 2022 17.14.0 Preview 3.0) [162ms]
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Preview
    • Visual Studio Professional 2022 version 17.14.36015.10
    • The current Visual Studio installation is a pre-release version. It may not be supported by Flutter yet.
    • Windows 10 SDK version 10.0.26100.0

[√] Android Studio (version 2024.3.2) [20ms]
    • Android Studio at C:\Users\pdong\AppData\Local\Programs\Android Studio
    • 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 21.0.6+-13368085-b895.109)

[√] VS Code (version 1.101.0) [18ms]
    • VS Code at C:\Users\pdong\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.112.0

[√] Connected device (4 available) [269ms]
    • sdk gphone64 x86 64 (mobile) • emulator-5554 • android-x64    • Android 16 (API 36) (emulator)
    • Windows (desktop)            • windows       • windows-x64    • Microsoft Windows [Version 10.0.26100.4351]
    • Chrome (web)                 • chrome        • web-javascript • Google Chrome 138.0.7204.51
    • Edge (web)                   • edge          • web-javascript • Microsoft Edge 138.0.3351.65

[√] Network resources [1,352ms]
    • All expected network resources are available.

• No issues found!

[biondiBagasta]

Any solution for this????