Unable to debug web apps using latest Flutter master / SDK DAPs

[DanTup]

When clicking the Dart Debug Extension button (edit: this happens on Chrome too, not specific to the debug extension), the connection is made but the app never loads.

Verbose logs contain this:

Connecting to VM Service at ws://127.0.0.1:54237/nxSUombw4hc=/ws
[ +107 ms] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 16, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 16, params: {streamId: Isolate, includePrivateMembers: false}}}}
[        ] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 17, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 17, params: {streamId: Debug, includePrivateMembers: false}}}}
[        ] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 18, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 18, params: {streamId: Logging, includePrivateMembers: false}}}}
[        ] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 19, error: {code: -32601, message: Method not found, data: {jsonrpc: 2.0, method: _setStreamIncludePrivateMembers, id: 19, params: {streamId: Extension, includePrivateMembers: false}}}}
[        ] DevHandler: VmService proxy responded with an error:
           {jsonrpc: 2.0, id: 21, error: {code: -32601, message: The stream `ToolEvent` is not supported on web devices}}
[  +51 ms] ExpressionEvaluator: Evaluating "() => true" at packages/flutter/src/widgets/title.dart
[  +34 ms] ExpressionEvaluator: Evaluated "() => true" to "boolean true" for isolate 1

It's unclear which (if any) of these are causing the issue.

[DanTup]

@elliette FYI - this may affect today's testing. I did a release of Dart-Code today that re-enabled the SDK DAPs for users on latest master of Flutter.

An immediate workaround is to disable SDK DAPs with this VS Code setting:

"dart.previewSdkDaps": false,

Depending on the cause (and how quick a fix will arrive in the SDK) we may need to hot-fix Dart-Code to bump using the SDK DAPs further back (or at least do so in a pre-release version and users of Flutter master can use that).

(I'm looking into it and will post my findings shortly)

[DanTup]

{jsonrpc: 2.0, id: 21, error: {code: -32601, message: The stream `ToolEvent` is not supported on web devices}}

This is the issue. Removing the code that tries to listen on this stream fixes the issue. I'm going to temporarily revert change to enable SDK DAPs in a pre-release version of the extension (so people testing have an option) but I'll hang fire on pushing out a stable release unless it's clear we can't fix this in Flutter master fairly quickly.

[DanTup]

Edit: moved to #4414 (comment)

[DanTup]

I originally thought this was only affecting the Dart Debug extension, but it's affecting Chrome too. I'm going to push a stable Dart-Code to delay enabling the SDK DAPs (Dart 3 pre-releases might mean more people on pre-releases) to resolve this, and have opened #4414 to track the proper fix.