Support for reloading httpClient connectTimeout Configuration

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2020 the original author or authors.
+ * Copyright 2013-2025 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.
@@ -254,7 +254,8 @@ protected Mono<HttpClient> getHttpClientMono(Route route, ServerWebExchange exch
 	 * @return the configured HttpClient.
 	 */
 	protected HttpClient getHttpClient(Route route, ServerWebExchange exchange) {
-		Object connectTimeoutAttr = route.getMetadata().get(CONNECT_TIMEOUT_ATTR);
+		Object connectTimeoutAttr = route.getMetadata().get(CONNECT_TIMEOUT_ATTR) != null
+				? route.getMetadata().get(CONNECT_TIMEOUT_ATTR) : properties.getConnectTimeout();
 		if (connectTimeoutAttr != null) {
 			Integer connectTimeout = getInteger(connectTimeoutAttr);
 			return this.httpClient.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, connectTimeout);

spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/filter/NettyRoutingFilterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2020 the original author or authors.
+ * Copyright 2013-2025 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.
@@ -16,25 +16,35 @@
 
 package org.springframework.cloud.gateway.filter;
 
+import java.util.Collections;
+import java.util.HashMap;
+
+import io.netty.channel.ChannelOption;
 import org.hamcrest.Matchers;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import reactor.core.publisher.Mono;
 import reactor.netty.DisposableServer;
+import reactor.netty.http.client.HttpClient;
+import reactor.netty.http.client.HttpClientConfig;
 import reactor.netty.http.server.HttpServer;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringBootConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.cloud.context.environment.EnvironmentChangeEvent;
+import org.springframework.cloud.gateway.route.Route;
 import org.springframework.cloud.gateway.route.RouteLocator;
 import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
 import org.springframework.cloud.gateway.test.BaseWebClientTests;
 import org.springframework.cloud.gateway.test.PermitAllSecurityConfiguration;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Import;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MapPropertySource;
 import org.springframework.test.util.TestSocketUtils;
 import org.springframework.test.web.reactive.server.WebTestClient;
 
@@ -48,6 +58,12 @@ class NettyRoutingFilterTests extends BaseWebClientTests {
 	@Autowired
 	private ApplicationContext context;
 
+	@Autowired
+	private NettyRoutingFilter nettyRoutingFilter;
+
+	@Autowired
+	private RouteLocator routeLocator;
+
 	@BeforeAll
 	public static void beforeAll() {
 		port = TestSocketUtils.findAvailableTcpPort();
@@ -88,6 +104,30 @@ void testCaseInsensitiveScheme() {
 		}
 	}
 
+	@Test
+	void testConnectTimeoutConfigurationReloadWorks() {
+		ConfigurableEnvironment environment = (ConfigurableEnvironment) this.context.getEnvironment();
+		HashMap<String, Object> map = new HashMap<>();
+		environment.getPropertySources().addFirst(new MapPropertySource("mock", map));
+		map.put("spring.cloud.gateway.httpclient.connect-timeout", "1000");
+		this.context.publishEvent(new EnvironmentChangeEvent(this.context,
+				Collections.singleton("spring.cloud.gateway.httpclient.connect-timeout")));
+		Route route = routeLocator.getRoutes()
+				.filter(r -> r.getId().equals("refreshable_configuration_test")).blockLast();
+		assertThat(route).isNotNull();
+		HttpClient httpClient = nettyRoutingFilter.getHttpClient(route, null);
+		HttpClientConfig configuration = httpClient.configuration();
+		assertThat(configuration.options().get(ChannelOption.CONNECT_TIMEOUT_MILLIS)).isEqualTo(1000);
+
+		map.put("spring.cloud.gateway.httpclient.connect-timeout", "5000");
+		this.context.publishEvent(new EnvironmentChangeEvent(this.context,
+				Collections.singleton("spring.cloud.gateway.httpclient.connect-timeout")));
+		httpClient = nettyRoutingFilter.getHttpClient(route, null);
+		configuration = httpClient.configuration();
+		assertThat(configuration.options().get(ChannelOption.CONNECT_TIMEOUT_MILLIS)).isEqualTo(5000);
+		environment.getPropertySources().remove("mock");
+	}
+
 	@SpringBootConfiguration
 	@EnableAutoConfiguration
 	@Import(PermitAllSecurityConfiguration.class)
@@ -98,6 +138,7 @@ public RouteLocator routes(RouteLocatorBuilder builder) {
 			return builder.routes()
 				.route(p -> p.path("/mockexample").filters(f -> f.prefixPath("/httpbin")).uri("http://example.com"))
 				.route(p -> p.path("/issue").uri("HTTP://127.0.0.1:" + port))
+				.route("refreshable_configuration_test", p -> p.path("/refresh").uri("http://example.com"))
 				.build();
 		}