Update localAddress handling in StandardWebSocketClient

Closes gh-34331

Author: rstoyanchev

spring-websocket/src/main/java/org/springframework/web/socket/WebSocketSession.java

@@ -73,11 +73,9 @@ public interface WebSocketSession extends Closeable {
 	/**
 	 * Return the address on which the request was received.
 	 * <p><strong>Note:</strong> The localAddress is not always possible to access,
-	 * which is the case with the Standard WebSocket client. In 6.2.x
+	 * which is the case with the Standard WebSocket client API, and accordingly
 	 * {@link org.springframework.web.socket.client.standard.StandardWebSocketClient}
-	 * returns an address based on the local host and the port of the target
-	 * address (not the same as the local port). In 7.0, the same will return
-	 * {@code null} instead.
+	 * returns {@code null}.
 	 */
 	@Nullable InetSocketAddress getLocalAddress();
 

spring-websocket/src/main/java/org/springframework/web/socket/client/standard/StandardWebSocketClient.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -149,12 +149,10 @@ protected CompletableFuture<WebSocketSession> executeInternal(WebSocketHandler w
 			HttpHeaders headers, final URI uri, List<String> protocols,
 			List<WebSocketExtension> extensions, Map<String, Object> attributes) {
 
-		int port = getPort(uri);
-		InetSocketAddress localAddress = new InetSocketAddress(getLocalHost(), port);
-		InetSocketAddress remoteAddress = new InetSocketAddress(uri.getHost(), port);
+		InetSocketAddress remoteAddress = new InetSocketAddress(uri.getHost(), getPort(uri));
 
-		StandardWebSocketSession session = new StandardWebSocketSession(headers,
-				attributes, localAddress, remoteAddress);
+		StandardWebSocketSession session =
+				new StandardWebSocketSession(headers, attributes, null, remoteAddress);
 
 		ClientEndpointConfig endpointConfig = ClientEndpointConfig.Builder.create()
 				.configurator(new StandardWebSocketClientConfigurator(headers))

spring-websocket/src/test/java/org/springframework/web/socket/client/standard/StandardWebSocketClientTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -60,18 +60,11 @@ class StandardWebSocketClientTests {
 	void getLocalAddress() throws Exception {
 		URI uri = URI.create("ws://localhost/abc");
 		WebSocketSession session = this.wsClient.execute(this.wsHandler, this.headers, uri).get();
+		assertThat(session.getLocalAddress()).isNull();
 
-		assertThat(session.getLocalAddress()).isNotNull();
-		assertThat(session.getLocalAddress().getPort()).isEqualTo(80);
-	}
-
-	@Test
-	void getLocalAddressWss() throws Exception {
-		URI uri = URI.create("wss://localhost/abc");
-		WebSocketSession session = this.wsClient.execute(this.wsHandler, this.headers, uri).get();
-
-		assertThat(session.getLocalAddress()).isNotNull();
-		assertThat(session.getLocalAddress().getPort()).isEqualTo(443);
+		uri = URI.create("wss://localhost/abc");
+		session = this.wsClient.execute(this.wsHandler, this.headers, uri).get();
+		assertThat(session.getLocalAddress()).isNull();
 	}
 
 	@Test
@@ -88,7 +81,7 @@ void getRemoteAddress() throws Exception {
 
 		assertThat(session.getRemoteAddress()).isNotNull();
 		assertThat(session.getRemoteAddress().getHostName()).isEqualTo("localhost");
-		assertThat(session.getLocalAddress().getPort()).isEqualTo(443);
+		assertThat(session.getLocalAddress()).isNull();
 	}
 
 	@Test