diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/HandshakeWebSocketService.java b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/HandshakeWebSocketService.java
index b9da1e4d02f..9eed2bf0030 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/HandshakeWebSocketService.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/HandshakeWebSocketService.java
@@ -254,8 +254,7 @@ public class HandshakeWebSocketService implements WebSocketService, Lifecycle {
 		URI uri = request.getURI();
 		// Copy request headers, as they might be pooled and recycled by
 		// the server implementation once the handshake HTTP exchange is done.
-		HttpHeaders headers = new HttpHeaders();
-		headers.addAll(request.getHeaders());
+		HttpHeaders headers = HttpHeaders.copyOf(request.getHeaders());
 		MultiValueMap<String, HttpCookie> cookies = request.getCookies();
 		Mono<Principal> principal = exchange.getPrincipal();
 		String logPrefix = exchange.getLogPrefix();
diff --git a/spring-websocket/src/main/java/org/springframework/web/socket/server/standard/StandardWebSocketUpgradeStrategy.java b/spring-websocket/src/main/java/org/springframework/web/socket/server/standard/StandardWebSocketUpgradeStrategy.java
index 5890430f220..956f7503467 100644
--- a/spring-websocket/src/main/java/org/springframework/web/socket/server/standard/StandardWebSocketUpgradeStrategy.java
+++ b/spring-websocket/src/main/java/org/springframework/web/socket/server/standard/StandardWebSocketUpgradeStrategy.java
@@ -97,7 +97,9 @@ public class StandardWebSocketUpgradeStrategy implements RequestUpgradeStrategy
 			@Nullable Principal user, WebSocketHandler wsHandler, Map<String, Object> attrs)
 			throws HandshakeFailureException {
 
-		HttpHeaders headers = request.getHeaders();
+		// Copy request headers, as they might be pooled and recycled by
+		// the server implementation once the handshake HTTP exchange is done.
+		HttpHeaders headers = HttpHeaders.copyOf(request.getHeaders());
 		InetSocketAddress localAddr = null;
 		try {
 			localAddr = request.getLocalAddress();
diff --git a/spring-websocket/src/test/java/org/springframework/web/socket/WebSocketHandshakeTests.java b/spring-websocket/src/test/java/org/springframework/web/socket/WebSocketHandshakeTests.java
index 6c824209762..ab35f7fcefb 100644
--- a/spring-websocket/src/test/java/org/springframework/web/socket/WebSocketHandshakeTests.java
+++ b/spring-websocket/src/test/java/org/springframework/web/socket/WebSocketHandshakeTests.java
@@ -16,6 +16,7 @@
 
 package org.springframework.web.socket;
 
+import java.io.IOException;
 import java.net.URI;
 import java.util.ArrayList;
 import java.util.List;
@@ -87,6 +88,26 @@ class WebSocketHandshakeTests extends AbstractWebSocketIntegrationTests {
 	}
 
 
+	@ParameterizedWebSocketTest
+	void useHeadersAfterHandshake(
+			WebSocketTestServer server, WebSocketClient webSocketClient, TestInfo testInfo) throws Exception {
+
+		super.setup(server, webSocketClient, testInfo);
+
+		WebSocketHttpHeaders headers = new WebSocketHttpHeaders();
+		URI url = URI.create(getWsBaseUrl() + "/ws");
+		WebSocketSession session = this.webSocketClient.execute(new TextWebSocketHandler(), headers, url).get();
+		TestWebSocketHandler serverHandler = this.wac.getBean(TestWebSocketHandler.class);
+		serverHandler.setWaitMessageCount(1);
+
+		session.sendMessage(new TextMessage("header"));
+
+		session.close();
+		serverHandler.await();
+		assertThat(serverHandler.getReceivedMessages()).hasSize(1);
+	}
+
+
 	@Configuration
 	@EnableWebSocket
 	static class TestConfig implements WebSocketConfigurer {
@@ -131,7 +152,10 @@ class WebSocketHandshakeTests extends AbstractWebSocketIntegrationTests {
 		}
 
 		@Override
-		public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) {
+		public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws IOException {
+			if (message instanceof TextMessage textMessage && textMessage.getPayload().equals("header")) {
+				session.sendMessage(new TextMessage(session.getHandshakeHeaders().headerNames().toString()));
+			}
 			this.receivedMessages.add(message);
 			if (this.receivedMessages.size() >= this.waitMessageCount) {
 				this.latch.countDown();