Timeout http upgrade requests that are not otherwise handled

Fixes #2956

packages/node_modules/node-red/settings.js

@@ -46,6 +46,12 @@ module.exports = {
     //  defaults to 10Mb
     //execMaxBufferSize: 10000000,
 
+    // Timeout in milliseconds for inbound WebSocket connections that do not
+    // match any configured node.
+    //  defaults to 5000
+    //inboundWebSocketTimeout: 5000
+
+
     // The maximum length, in characters, of any message sent to the debug sidebar tab
     debugMaxLength: 1000,