diff --git a/.github/workflows/e2e-test.yml b/.github/workflows/e2e-test.yml
index ed323aa..3fe9535 100644
--- a/.github/workflows/e2e-test.yml
+++ b/.github/workflows/e2e-test.yml
@@ -62,7 +62,7 @@ jobs:
       - name: Scan etherpad instance
         uses: GuillaumeFalourd/assert-command-line-output@v2.4
         with:
-          command_line: bin/console.php ether:scan -vvv http://localhost:8080 | grep -E "Package version|HTTP/1.1 400" | sed 's/ *$//'
+          command_line: bin/console.php ether:scan -vvv http://localhost:8080 | grep -E "Package version|HTTP/1.1 400|Websocket" | sed 's/ *$//'
           assert_file_path: tests/e2e/fixture/reverse_proxy_no_websocket.txt
           expected_result: PASSED
 
diff --git a/src/Console/ScanCommandOutputHelper.php b/src/Console/ScanCommandOutputHelper.php
index e0dd7d4..3521362 100644
--- a/src/Console/ScanCommandOutputHelper.php
+++ b/src/Console/ScanCommandOutputHelper.php
@@ -137,9 +137,14 @@ public function onScanPadException(Throwable $e): void
         $this->symfonyStyle->error($e->getMessage());
     }
 
-    public function onScanPadSuccess(): void
+    public function onScanPadSuccess(bool $usedWebsocket): void
     {
         $this->symfonyStyle->success('Pads are publicly accessible');
+        if ($usedWebsocket) {
+            $this->symfonyStyle->success('Websocket is supported');
+        } else {
+            $this->symfonyStyle->error('Websocket is not supported');
+        }
     }
 
     public function onVersionResult(?string $minVersion, ?string $maxVersion): void
diff --git a/src/Service/ScannerService.php b/src/Service/ScannerService.php
index 96a3e02..0da85e9 100644
--- a/src/Service/ScannerService.php
+++ b/src/Service/ScannerService.php
@@ -4,6 +4,7 @@
 namespace Gared\EtherScan\Service;
 
 use ElephantIO\Client as ElephantClient;
+use ElephantIO\Engine\SocketIO;
 use Exception;
 use Gared\EtherScan\Api\GithubApi;
 use Gared\EtherScan\Exception\EtherpadServiceNotFoundException;
@@ -337,6 +338,10 @@ private function doSocketWebsocket(
             'password' => null,
             'protocolVersion' => 2,
         ]);
+        $engine = $socketIoClient->getEngine();
+        if ($engine instanceof SocketIO === false) {
+            throw new Exception('Engine of unsupported class');
+        }
 
         while ($result = $socketIoClient->wait('message', 2)) {
             if (is_array($result->data)) {
@@ -357,7 +362,7 @@ private function doSocketWebsocket(
                 $this->versionRangeService->setPackageVersion($version);
                 $callback->onClientVars($version, $result->data);
                 $callback->onScanPluginsList($onlyPlugins);
-                $callback->onScanPadSuccess();
+                $callback->onScanPadSuccess($engine->getTransport() === SocketIO::TRANSPORT_WEBSOCKET);
                 break;
             }
         }
diff --git a/src/Service/ScannerServiceCallbackInterface.php b/src/Service/ScannerServiceCallbackInterface.php
index 05f097b..ec8d44b 100644
--- a/src/Service/ScannerServiceCallbackInterface.php
+++ b/src/Service/ScannerServiceCallbackInterface.php
@@ -54,7 +54,7 @@ public function onScanPadStart(): void;
 
     public function onScanPadException(Throwable $e): void;
 
-    public function onScanPadSuccess(): void;
+    public function onScanPadSuccess(bool $usedWebsocket): void;
 
     public function onVersionResult(?string $minVersion, ?string $maxVersion): void;
 
@@ -64,4 +64,4 @@ public function onVersionResult(?string $minVersion, ?string $maxVersion): void;
     public function onClientVars(string $version, array $data): void;
 
     public function getConsoleLogger(): ?LoggerInterface;
-}
\ No newline at end of file
+}
diff --git a/tests/e2e/fixture/latest.txt b/tests/e2e/fixture/latest.txt
index 2ad8f7a..5d865c5 100644
--- a/tests/e2e/fixture/latest.txt
+++ b/tests/e2e/fixture/latest.txt
@@ -15,6 +15,8 @@ Starting scan of a pad...
 
  [OK] Pads are publicly accessible
 
+ [OK] Websocket is supported
+
  [OK] Server is healthy
 
  [INFO] Version is $EP_VERSION
diff --git a/tests/e2e/fixture/master_with_plugins.txt b/tests/e2e/fixture/master_with_plugins.txt
index 4c9861f..8c89d8e 100644
--- a/tests/e2e/fixture/master_with_plugins.txt
+++ b/tests/e2e/fixture/master_with_plugins.txt
@@ -20,6 +20,8 @@ Plugins:
 
  [OK] Pads are publicly accessible
 
+ [OK] Websocket is supported
+
  [OK] Server is healthy
 
 
diff --git a/tests/e2e/fixture/reverse_proxy_no_websocket.txt b/tests/e2e/fixture/reverse_proxy_no_websocket.txt
index 0c5adf9..b40ba92 100644
--- a/tests/e2e/fixture/reverse_proxy_no_websocket.txt
+++ b/tests/e2e/fixture/reverse_proxy_no_websocket.txt
@@ -1,2 +1,3 @@
 [debug] Stream receive: HTTP/1.1 400 Bad Request
  [INFO] Package version: 1.8.17
+ [ERROR] Websocket is not supported