From cf825f16a889c3f9c128f5c1b46bda978c6f979d Mon Sep 17 00:00:00 2001
From: Shang Xiang <Shang@Uber.com>
Date: Tue, 26 Nov 2024 16:30:35 +0100
Subject: [PATCH] Update the pointer of Continuation's headerBuffer after
 copying the payload.

---
 .../core5/http2/impl/nio/AbstractH2StreamMultiplexer.java  | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/AbstractH2StreamMultiplexer.java b/httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/AbstractH2StreamMultiplexer.java
index f7792f8aa..c9d67c9e3 100644
--- a/httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/AbstractH2StreamMultiplexer.java
+++ b/httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/AbstractH2StreamMultiplexer.java
@@ -1342,8 +1342,11 @@ void copyPayload(final ByteBuffer payload) {
             if (payload == null) {
                 return;
             }
-            headerBuffer.ensureCapacity(payload.remaining());
-            payload.get(headerBuffer.array(), headerBuffer.length(), payload.remaining());
+            int originalLength = headerBuffer.length();
+            int toCopy = payload.remaining();
+            headerBuffer.ensureCapacity(toCopy);
+            payload.get(headerBuffer.array(), originalLength, toCopy);
+            headerBuffer.setLength(originalLength + toCopy);
         }
 
         ByteBuffer getContent() {