Expose localAddress in WebFlux server

Closes gh-24174

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/DefaultServerRequest.java

@@ -122,6 +122,11 @@ class DefaultServerRequest implements ServerRequest {
 		return Optional.ofNullable(request().getRemoteAddress());
 	}
 
+	@Override
+	public Optional<InetSocketAddress> localAddress() {
+		return Optional.ofNullable(request().getLocalAddress());
+	}
+
 	@Override
 	public List<HttpMessageReader<?>> messageReaders() {
 		return this.messageReaders;

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RequestPredicates.java

@@ -947,6 +947,11 @@ public abstract class RequestPredicates {
 			return this.request.remoteAddress();
 		}
 
+		@Override
+		public Optional<InetSocketAddress> localAddress() {
+			return this.request.localAddress();
+		}
+
 		@Override
 		public List<HttpMessageReader<?>> messageReaders() {
 			return this.request.messageReaders();

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/ServerRequest.java

@@ -124,6 +124,12 @@ public interface ServerRequest {
 	 */
 	Optional<InetSocketAddress> remoteAddress();
 
+	/**
+	 * Get the remote address to which this request is connected, if available.
+	 * @since 5.2.3
+	 */
+	Optional<InetSocketAddress> localAddress();
+
 	/**
 	 * Get the readers used to convert the body of this request.
 	 * @since 5.1

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/support/ServerRequestWrapper.java

@@ -123,6 +123,11 @@ public class ServerRequestWrapper implements ServerRequest {
 		return this.delegate.remoteAddress();
 	}
 
+	@Override
+	public Optional<InetSocketAddress> localAddress() {
+		return this.delegate.localAddress();
+	}
+
 	@Override
 	public List<HttpMessageReader<?>> messageReaders() {
 		return this.delegate.messageReaders();