Guard the websocket upgrade to only happen once for a request.

Without that guard in place it could happen multiple times as
"basic.invoke(req, resp);" could lead to the invocation of another
PipeLine executing the same code.

Signed-off-by: Arjan Tijms <arjan.tijms@omnifish.ee>

appserver/web/web-core/src/main/java/org/apache/catalina/core/StandardPipeline.java

@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2024 Contributors to the Eclipse Foundation.
  * Copyright (c) 1997-2018 Oracle and/or its affiliates. All rights reserved.
  * Copyright 2004 The Apache Software Foundation
  *
@@ -586,7 +587,8 @@ private void doInvoke(Request request, Response response, boolean chaining) thro
         // Calls the protocol handler's init method if the request is marked to be upgraded
         if (request instanceof org.apache.catalina.connector.Request) {
             org.apache.catalina.connector.Request connectorRequest = (org.apache.catalina.connector.Request) request;
-            if (connectorRequest.isUpgrade()) {
+
+            if (connectorRequest.getNote(AFTER_UPGRADE_HANDLER_INITIALIZED) == null && connectorRequest.isUpgrade()) {
                 HttpUpgradeHandler handler = connectorRequest.getHttpUpgradeHandler();
                 if (handler != null) {
                     WebConnectionImpl webConnectionImpl =
@@ -606,6 +608,7 @@ private void doInvoke(Request request, Response response, boolean chaining) thro
                         handler.init(webConnectionImpl);
                     } finally {
                         context.fireContainerEvent(AFTER_UPGRADE_HANDLER_INITIALIZED, handler);
+                        connectorRequest.setNote(AFTER_UPGRADE_HANDLER_INITIALIZED, true);
                     }
                 } else {
                     log.log(SEVERE, PROTOCOL_HANDLER_REQUIRED_EXCEPTION);