"flutter attach" fails for web: "_createDevFS: (-32601) Unknown method "_createDevFS" #149258
Description
Steps to reproduce
If I start an application from one terminal using flutter run -d windows and then in another terminal I use flutter attach --machine to attach to it, I see no errors and flutter attach correctly outputs an app.started event. This event is what VS Code/DAP use to communicate with Flutter when attaching.
If I repeat the same steps but using the Chrome device, then I see an error "_createDevFS: (-32601) Unknown method "_createDevFS" and no app.started event is emitted, instead you get an "app.stop" with an error (note: you can repro this without the --machine and you'll just see the message written to the console, but it's less obvious what the IDE is setting).
The full stack looks like:
#0 new _OutstandingRequest (package:vm_service/src/vm_service.dart:265:34)
#1 VmService._call.<anonymous closure> (package:vm_service/src/vm_service.dart:1775:25)
#2 VmService._call (package:vm_service/src/vm_service.dart:1787:8)
#3 VmService.callServiceExtension (package:vm_service/src/vm_service.dart:1733:14)
#4 FlutterVmService.createDevFS (package:flutter_tools/src/vmservice.dart:1065:20)
#5 DevFS.create (package:flutter_tools/src/devfs.dart:516:61)
#6 FlutterDevice.setupDevFS (package:flutter_tools/src/resident_runner.dart:396:19)
#7 HotRunner._initDevFS (package:flutter_tools/src/run_hot.dart:482:23)
#8 HotRunner.attach (package:flutter_tools/src/run_hot.dart:272:41)
<asynchronous suspension>
#9 AppDomain.launch.<anonymous closure> (package:flutter_tools/src/commands/daemon.dart:815:9)
<asynchronous suspension>
#10 AppDomain.launch (package:flutter_tools/src/commands/daemon.dart:813:5)
<asynchronous suspension>
#11 AttachCommand._attachToDevice (package:flutter_tools/src/commands/attach.dart:356:17)
<asynchronous suspension>
#12 AttachCommand.runCommand (package:flutter_tools/src/commands/attach.dart:265:5)
I'm not certain if using attach like this is supported, though it's how some of the integration tests work (and I'd expect behaviour to be similar between web/VM).
Expected results
Attaching to Chrome should behave the same as attaching to a VM.
Actual results
Attaching to Chrome fails with an error.
Code sample
This can be reproduced just using a simple flutter create app.
Screenshots or Video
No response
Logs
No response
Flutter Doctor output
Doctor output
PS C:\Dev\Test Projects\flutter_counter> flutter doctor -v
[!] Flutter (Channel [user-branch], 3.23.0-13.0.pre.5, on Microsoft Windows [Version 10.0.22631.3593], locale en-GB)
! Flutter version 3.23.0-13.0.pre.5 on channel [user-branch] at C:\Dev\Google\Flutter\Flutter main
Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
If that doesn't fix the issue, reinstall Flutter by following instructions at https://flutter.dev/docs/get-started/install.
• Upstream repository [email protected]:DanTup/flutter.git
• FLUTTER_GIT_URL = [email protected]:DanTup/flutter.git
• Framework revision 76abb6467c (34 minutes ago), 2024-05-29 17:28:30 +0100
• Engine revision 30aa720d49
• Dart version 3.5.0 (build 3.5.0-191.0.dev)
• DevTools version 2.36.0-dev.10
• If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.
[√] Windows Version (Installed version of Windows is version 10 or higher)
[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
• Android SDK at C:\Users\danny\AppData\Local\Android\sdk
• Platform android-34, build-tools 34.0.0
• Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
• Java version OpenJDK Runtime Environment (build 17.0.9+0--11185874)
• All Android licenses accepted.
[√] Chrome - develop for the web
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe
[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.7.4)
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
• Visual Studio Community 2022 version 17.7.34031.279
• Windows 10 SDK version 10.0.22621.0
[√] Android Studio (version 2023.2)
• Android Studio at C:\Program Files\Android\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 17.0.9+0--11185874)
[√] VS Code (version 1.89.1)
• VS Code at C:\Users\danny\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.91.20240529
[√] VS Code (version 1.90.0-insider)
• VS Code at C:\Users\danny\AppData\Local\Programs\Microsoft VS Code Insiders
• Flutter extension version 3.89.20240501
[√] Connected device (3 available)
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.22631.3593]
• Chrome (web) • chrome • web-javascript • Google Chrome 125.0.6422.112
• Edge (web) • edge • web-javascript • Microsoft Edge 125.0.2535.51
[√] Network resources
• All expected network resources are available.
! Doctor found issues in 1 category.