diff --git a/packages/flutter_tools/lib/src/build_runner/devfs_web.dart b/packages/flutter_tools/lib/src/build_runner/devfs_web.dart
index ac8eb23..d8d9b4a 100644
--- a/packages/flutter_tools/lib/src/build_runner/devfs_web.dart
+++ b/packages/flutter_tools/lib/src/build_runner/devfs_web.dart
@@ -42,6 +42,7 @@
   bool enableDebugExtension,
   String hostname,
   bool useSseForDebugProxy,
+  bool useSseForDebugBackend,
   bool serveDevTools,
   void Function(Level, String) logWriter,
   bool verbose,
@@ -142,6 +143,7 @@
     int port,
     UrlTunneller urlTunneller,
     bool useSseForDebugProxy,
+    bool useSseForDebugBackend,
     BuildInfo buildInfo,
     bool enableDwds,
     Uri entrypoint,
@@ -235,6 +237,7 @@
         urlEncoder: urlTunneller,
         enableDebugging: true,
         useSseForDebugProxy: useSseForDebugProxy,
+        useSseForDebugBackend: useSseForDebugBackend,
         serveDevTools: false,
         logWriter: (Level logLevel, String message) => globals.printTrace(message),
         loadStrategy: RequireStrategy(
@@ -627,6 +630,7 @@
     @required this.packagesFilePath,
     @required this.urlTunneller,
     @required this.useSseForDebugProxy,
+    @required this.useSseForDebugBackend,
     @required this.buildInfo,
     @required this.enableDwds,
     @required this.entrypoint,
@@ -641,6 +645,7 @@
   final String packagesFilePath;
   final UrlTunneller urlTunneller;
   final bool useSseForDebugProxy;
+  final bool useSseForDebugBackend;
   final BuildInfo buildInfo;
   final bool enableDwds;
   final bool testMode;
@@ -708,6 +713,7 @@
       port,
       urlTunneller,
       useSseForDebugProxy,
+      useSseForDebugBackend,
       buildInfo,
       enableDwds,
       entrypoint,
diff --git a/packages/flutter_tools/lib/src/build_runner/resident_web_runner.dart b/packages/flutter_tools/lib/src/build_runner/resident_web_runner.dart
index faa6ef4..b5caf86 100644
--- a/packages/flutter_tools/lib/src/build_runner/resident_web_runner.dart
+++ b/packages/flutter_tools/lib/src/build_runner/resident_web_runner.dart
@@ -448,6 +448,7 @@
           packagesFilePath: packagesFilePath,
           urlTunneller: urlTunneller,
           useSseForDebugProxy: debuggingOptions.webUseSseForDebugProxy,
+          useSseForDebugBackend: debuggingOptions.webUseSseForDebugBackend,
           buildInfo: debuggingOptions.buildInfo,
           enableDwds: _enableDwds,
           entrypoint: globals.fs.file(target).uri,
diff --git a/packages/flutter_tools/lib/src/commands/run.dart b/packages/flutter_tools/lib/src/commands/run.dart
index 9dab375..862bd18 100644
--- a/packages/flutter_tools/lib/src/commands/run.dart
+++ b/packages/flutter_tools/lib/src/commands/run.dart
@@ -374,6 +374,7 @@
         hostname: featureFlags.isWebEnabled ? stringArg('web-hostname') : '',
         port: featureFlags.isWebEnabled ? stringArg('web-port') : '',
         webUseSseForDebugProxy: featureFlags.isWebEnabled && stringArg('web-server-debug-protocol') == 'sse',
+        webUseSseForDebugBackend: featureFlags.isWebEnabled && stringArg('web-server-debug-backend-protocol') == 'sse',
         webEnableExposeUrl: featureFlags.isWebEnabled && boolArg('web-allow-expose-url'),
         webRunHeadless: featureFlags.isWebEnabled && boolArg('web-run-headless'),
         webBrowserDebugPort: browserDebugPort,
@@ -400,6 +401,7 @@
         hostname: featureFlags.isWebEnabled ? stringArg('web-hostname') : '',
         port: featureFlags.isWebEnabled ? stringArg('web-port') : '',
         webUseSseForDebugProxy: featureFlags.isWebEnabled && stringArg('web-server-debug-protocol') == 'sse',
+        webUseSseForDebugBackend: featureFlags.isWebEnabled && stringArg('web-server-debug-backend-protocol') == 'sse',
         webEnableExposeUrl: featureFlags.isWebEnabled && boolArg('web-allow-expose-url'),
         webRunHeadless: featureFlags.isWebEnabled && boolArg('web-run-headless'),
         webBrowserDebugPort: browserDebugPort,
diff --git a/packages/flutter_tools/lib/src/device.dart b/packages/flutter_tools/lib/src/device.dart
index 2e1d158..0e9454b 100644
--- a/packages/flutter_tools/lib/src/device.dart
+++ b/packages/flutter_tools/lib/src/device.dart
@@ -738,6 +738,7 @@
     this.port,
     this.webEnableExposeUrl,
     this.webUseSseForDebugProxy = true,
+    this.webUseSseForDebugBackend = true,
     this.webRunHeadless = false,
     this.webBrowserDebugPort,
     this.webEnableExpressionEvaluation = false,
@@ -751,6 +752,7 @@
       this.hostname,
       this.webEnableExposeUrl,
       this.webUseSseForDebugProxy = true,
+      this.webUseSseForDebugBackend = true,
       this.webRunHeadless = false,
       this.webBrowserDebugPort,
       this.cacheSkSL = false,
@@ -797,6 +799,7 @@
   final String hostname;
   final bool webEnableExposeUrl;
   final bool webUseSseForDebugProxy;
+  final bool webUseSseForDebugBackend;
 
   /// Whether to run the browser in headless mode.
   ///
diff --git a/packages/flutter_tools/lib/src/runner/flutter_command.dart b/packages/flutter_tools/lib/src/runner/flutter_command.dart
index 7cd47bb..c525f22 100644
--- a/packages/flutter_tools/lib/src/runner/flutter_command.dart
+++ b/packages/flutter_tools/lib/src/runner/flutter_command.dart
@@ -184,11 +184,20 @@
       allowed: <String>['sse', 'ws'],
       defaultsTo: 'sse',
       help: 'The protocol (SSE or WebSockets) to use for the debug service proxy '
-      'when using the Web Server device and Dart Debugger extension. '
+      'when using the Web Server device and Dart Debug extension. '
       'This is useful for editors/debug adapters that do not support debugging '
       'over SSE (the default protocol for Web Server/Dart Debugger extension).',
       hide: hide,
     );
+    argParser.addOption('web-server-debug-backend-protocol',
+      allowed: <String>['sse', 'ws'],
+      defaultsTo: 'sse',
+      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 '
+      'some proxy servers.',
+      hide: hide,
+    );
     argParser.addFlag('web-allow-expose-url',
       defaultsTo: false,
       help: 'Enables daemon-to-editor requests (app.exposeUrl) for exposing URLs '