diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/BindingContext.java b/spring-webflux/src/main/java/org/springframework/web/reactive/BindingContext.java
index d10616e6b6..12b21d61a1 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/BindingContext.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/BindingContext.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -136,7 +136,7 @@ public class BindingContext {
 			return Mono.zip(Mono.just(vars), Mono.just(queryParams), formData, multipartData)
 					.map(tuple -> {
 						Map<String, Object> result = new TreeMap<>();
-						tuple.getT1().forEach(result::put);
+						result.putAll(tuple.getT1());
 						tuple.getT2().forEach((key, values) -> addBindValue(result, key, values));
 						tuple.getT3().forEach((key, values) -> addBindValue(result, key, values));
 						tuple.getT4().forEach((key, values) -> addBindValue(result, key, values));
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/JettyWebSocketClient.java b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/JettyWebSocketClient.java
index 9bbeb08f84..48c46ec67f 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/JettyWebSocketClient.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/JettyWebSocketClient.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -182,7 +182,7 @@ public class JettyWebSocketClient implements WebSocketClient, Lifecycle {
 
 	private HandshakeInfo createHandshakeInfo(URI url, Session jettySession) {
 		HttpHeaders headers = new HttpHeaders();
-		jettySession.getUpgradeResponse().getHeaders().forEach(headers::put);
+		headers.putAll(jettySession.getUpgradeResponse().getHeaders());
 		String protocol = headers.getFirst("Sec-WebSocket-Protocol");
 		return new HandshakeInfo(url, headers, Mono.empty(), protocol);
 	}
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/StandardWebSocketClient.java b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/StandardWebSocketClient.java
index 4bf98585a0..67ef0e7db4 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/StandardWebSocketClient.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/StandardWebSocketClient.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -171,7 +171,7 @@ public class StandardWebSocketClient implements WebSocketClient {
 
 		@Override
 		public void afterResponse(HandshakeResponse response) {
-			response.getHeaders().forEach(this.responseHeaders::put);
+			this.responseHeaders.putAll(response.getHeaders());
 		}
 	}
 
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/UndertowWebSocketClient.java b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/UndertowWebSocketClient.java
index 272e04f345..e8280c84b4 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/UndertowWebSocketClient.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/UndertowWebSocketClient.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -243,7 +243,7 @@ public class UndertowWebSocketClient implements WebSocketClient {
 
 		@Override
 		public void beforeRequest(Map<String, List<String>> headers) {
-			this.requestHeaders.forEach(headers::put);
+			headers.putAll(this.requestHeaders);
 			if (this.delegate != null) {
 				this.delegate.beforeRequest(headers);
 			}
@@ -251,7 +251,7 @@ public class UndertowWebSocketClient implements WebSocketClient {
 
 		@Override
 		public void afterRequest(Map<String, List<String>> headers) {
-			headers.forEach(this.responseHeaders::put);
+			this.responseHeaders.putAll(headers);
 			if (this.delegate != null) {
 				this.delegate.afterRequest(headers);
 			}