From b93760d3eac7eace084715599d9b1d9f7a14f423 Mon Sep 17 00:00:00 2001
From: Marco Collovati <marco@vaadin.com>
Date: Fri, 29 Nov 2024 09:33:54 +0100
Subject: [PATCH] fix: add vite-ping subprotocol to Vite websocket proxy
 (#20578)

Fixes #20574
---
 .../vaadin/base/devserver/viteproxy/ViteWebsocketEndpoint.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vaadin-dev-server/src/main/java/com/vaadin/base/devserver/viteproxy/ViteWebsocketEndpoint.java b/vaadin-dev-server/src/main/java/com/vaadin/base/devserver/viteproxy/ViteWebsocketEndpoint.java
index 032aade7a95..fb1e6a7f90a 100644
--- a/vaadin-dev-server/src/main/java/com/vaadin/base/devserver/viteproxy/ViteWebsocketEndpoint.java
+++ b/vaadin-dev-server/src/main/java/com/vaadin/base/devserver/viteproxy/ViteWebsocketEndpoint.java
@@ -66,7 +66,7 @@ public static void init(VaadinContext context, ViteHandler viteHandler) {
             return;
         }
         try {
-            List<String> subProtocols = Collections.singletonList("vite-hmr");
+            List<String> subProtocols = List.of("vite-hmr", "vite-ping");
             ServerEndpointConfig endpointConfig = ServerEndpointConfig.Builder
                     .create(ViteWebsocketEndpoint.class,
                             viteHandler.getPathToVaadinInContext())