[flutter_tools] swap web debugging protocol to ws (#82456)

packages/flutter_tools/lib/src/runner/flutter_command.dart

@@ -211,7 +211,7 @@ abstract class FlutterCommand extends Command<void> {
     );
     argParser.addOption('web-server-debug-protocol',
       allowed: <String>['sse', 'ws'],
-      defaultsTo: 'sse',
+      defaultsTo: 'ws',
       help: 'The protocol (SSE or WebSockets) to use for the debug service proxy '
       'when using the Web Server device and Dart Debug extension. '
       'This is useful for editors/debug adapters that do not support debugging '
@@ -220,7 +220,7 @@ abstract class FlutterCommand extends Command<void> {
     );
     argParser.addOption('web-server-debug-backend-protocol',
       allowed: <String>['sse', 'ws'],
-      defaultsTo: 'sse',
+      defaultsTo: 'ws',
       help: 'The protocol (SSE or WebSockets) to use for the Dart Debug Extension '
       'backend service when using the Web Server device. '
       'Using WebSockets can improve performance but may fail when connecting through '
@@ -229,7 +229,7 @@ abstract class FlutterCommand extends Command<void> {
     );
     argParser.addOption('web-server-debug-injected-client-protocol',
       allowed: <String>['sse', 'ws'],
-      defaultsTo: 'sse',
+      defaultsTo: 'ws',
       help: 'The protocol (SSE or WebSockets) to use for the injected client '
       'when using the Web Server device. '
       'Using WebSockets can improve performance but may fail when connecting through '

packages/flutter_tools/test/commands.shard/hermetic/run_test.dart

@@ -508,6 +508,20 @@ void main() {
       '--bundle-sksl-path=foo.json',
     ]), throwsToolExit(message: 'No SkSL shader bundle found at foo.json'));
   });
+
+  testUsingContext('Configures web connection options to use web sockets by default', () async {
+    final RunCommand command = RunCommand();
+    await expectLater(() => createTestCommandRunner(command).run(<String>[
+      'run',
+      '--no-pub',
+    ]), throwsToolExit());
+
+    final DebuggingOptions options = await command.createDebuggingOptions(true);
+
+    expect(options.webUseSseForDebugBackend, false);
+    expect(options.webUseSseForDebugProxy, false);
+    expect(options.webUseSseForInjectedClient, false);
+  });
 }
 
 class MockCache extends Mock implements Cache {}