From f960774f31c1ddc9ea4a6c99819d7a8a25494659 Mon Sep 17 00:00:00 2001
From: David Schlosnagle <davids@palantir.com>
Date: Wed, 10 Sep 2025 17:50:12 -0400
Subject: [PATCH] Avoid websocket ByteBuffer copy for single buffer

---
 core/src/main/java/io/undertow/websockets/core/WebSockets.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/src/main/java/io/undertow/websockets/core/WebSockets.java b/core/src/main/java/io/undertow/websockets/core/WebSockets.java
index b0f8c41f7c..83dff99bed 100644
--- a/core/src/main/java/io/undertow/websockets/core/WebSockets.java
+++ b/core/src/main/java/io/undertow/websockets/core/WebSockets.java
@@ -1018,6 +1018,9 @@ public static ByteBuffer mergeBuffers(ByteBuffer... payload) {
         if (size == 0) {
             return Buffers.EMPTY_BYTE_BUFFER;
         }
+        if (payload.length == 1) {
+            return payload[0].duplicate();
+        }
         ByteBuffer buffer = ByteBuffer.allocate(size);
         for (ByteBuffer buf : payload) {
             buffer.put(buf);