diff --git a/lib/servers/WebsocketServer.js b/lib/servers/WebsocketServer.js
index 21bfb0c344..8424b6d382 100644
--- a/lib/servers/WebsocketServer.js
+++ b/lib/servers/WebsocketServer.js
@@ -10,10 +10,20 @@ module.exports = class WebsocketServer extends BaseServer {
   constructor(server) {
     super(server);
     this.wsServer = new ws.Server({
-      server: this.server.listeningApp,
+      noServer: true,
       path: this.server.sockPath,
     });
 
+    this.server.listeningApp.on('upgrade', (req, sock, head) => {
+      if (!this.wsServer.shouldHandle(req)) {
+        return;
+      }
+
+      this.wsServer.handleUpgrade(req, sock, head, (connection) => {
+        this.wsServer.emit('connection', connection, req);
+      });
+    });
+
     this.wsServer.on('error', (err) => {
       this.server.log.error(err.message);
     });
diff --git a/test/server/proxy-option.test.js b/test/server/proxy-option.test.js
index 6f21967248..49368d3627 100644
--- a/test/server/proxy-option.test.js
+++ b/test/server/proxy-option.test.js
@@ -257,49 +257,55 @@ describe('proxy option', () => {
     let wsServer;
     let responseMessage;
 
-    beforeAll((done) => {
-      testServer.start(
-        config,
-        {
-          contentBase,
-          proxy: [
+    const transportModes = ['sockjs', 'ws'];
+    transportModes.forEach((transportMode) => {
+      describe(`with transportMode: ${transportMode}`, () => {
+        beforeAll((done) => {
+          testServer.start(
+            config,
             {
-              context: '/',
-              target: `http://localhost:${port4}`,
-              ws: true,
+              contentBase,
+              transportMode,
+              proxy: [
+                {
+                  context: '/',
+                  target: `http://localhost:${port4}`,
+                  ws: true,
+                },
+              ],
+              port: port3,
             },
-          ],
-          port: port3,
-        },
-        done
-      );
-
-      wsServer = new WebSocketServer({ port: port4 });
-      wsServer.on('connection', (server) => {
-        server.on('message', (message) => {
-          server.send(message);
+            done
+          );
+
+          wsServer = new WebSocketServer({ port: port4 });
+          wsServer.on('connection', (server) => {
+            server.on('message', (message) => {
+              server.send(message);
+            });
+          });
         });
-      });
-    });
 
-    beforeEach((done) => {
-      ws = new WebSocket(`ws://localhost:${port3}/proxy3/socket`);
-      ws.on('message', (message) => {
-        responseMessage = message;
-        done();
-      });
-      ws.on('open', () => {
-        ws.send('foo');
-      });
-    });
+        beforeEach((done) => {
+          ws = new WebSocket(`ws://localhost:${port3}/proxy3/socket`);
+          ws.on('message', (message) => {
+            responseMessage = message;
+            done();
+          });
+          ws.on('open', () => {
+            ws.send('foo');
+          });
+        });
 
-    it('Should receive response', () => {
-      expect(responseMessage).toEqual('foo');
-    });
+        it('Should receive response', () => {
+          expect(responseMessage).toEqual('foo');
+        });
 
-    afterAll((done) => {
-      wsServer.close();
-      testServer.close(done);
+        afterAll((done) => {
+          wsServer.close();
+          testServer.close(done);
+        });
+      });
     });
   });