Make host ignoring port opt in.

This makes gh-3037 opt in by setting spring.cloud.gateway.predicate.host.include-port=false

Fixes gh-3190

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/config/GatewayAutoConfiguration.java

@@ -442,8 +442,9 @@ public class GatewayAutoConfiguration {
 
 	@Bean
 	@ConditionalOnEnabledPredicate
-	public HostRoutePredicateFactory hostRoutePredicateFactory() {
-		return new HostRoutePredicateFactory();
+	public HostRoutePredicateFactory hostRoutePredicateFactory(Environment env) {
+		boolean includePort = env.getProperty("spring.cloud.gateway.predicate.host.include-port", Boolean.class, true);
+		return new HostRoutePredicateFactory(includePort);
 	}
 
 	@Bean

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/handler/predicate/HostRoutePredicateFactory.java

@@ -35,16 +35,27 @@ import org.springframework.web.server.ServerWebExchange;
  */
 public class HostRoutePredicateFactory extends AbstractRoutePredicateFactory<HostRoutePredicateFactory.Config> {
 
+	private boolean includePort = true;
+
 	private PathMatcher pathMatcher = new AntPathMatcher(".");
 
 	public HostRoutePredicateFactory() {
+		this(true);
+	}
+
+	public HostRoutePredicateFactory(boolean includePort) {
 		super(Config.class);
+		this.includePort = includePort;
 	}
 
 	public void setPathMatcher(PathMatcher pathMatcher) {
 		this.pathMatcher = pathMatcher;
 	}
 
+	/* for testing */ void setIncludePort(boolean includePort) {
+		this.includePort = includePort;
+	}
+
 	@Override
 	public List<String> shortcutFieldOrder() {
 		return Collections.singletonList("patterns");
@@ -60,25 +71,35 @@ public class HostRoutePredicateFactory extends AbstractRoutePredicateFactory<Hos
 		return new GatewayPredicate() {
 			@Override
 			public boolean test(ServerWebExchange exchange) {
-				InetSocketAddress address = exchange.getRequest().getHeaders().getHost();
-				if (address != null) {
-					String match = null;
-					String host = address.getHostName();
-					for (int i = 0; i < config.getPatterns().size(); i++) {
-						String pattern = config.getPatterns().get(i);
-						if (pathMatcher.match(pattern, host)) {
-							match = pattern;
-							break;
-						}
-					}
-
-					if (match != null) {
-						Map<String, String> variables = pathMatcher.extractUriTemplateVariables(match, host);
-						ServerWebExchangeUtils.putUriTemplateVariables(exchange, variables);
-						return true;
-					}
-
+				String host;
+				if (includePort) {
+					host = exchange.getRequest().getHeaders().getFirst("Host");
 				}
+				else {
+					InetSocketAddress address = exchange.getRequest().getHeaders().getHost();
+					if (address != null) {
+						host = address.getHostString();
+					}
+					else {
+						return false;
+					}
+				}
+
+				String match = null;
+				for (int i = 0; i < config.getPatterns().size(); i++) {
+					String pattern = config.getPatterns().get(i);
+					if (pathMatcher.match(pattern, host)) {
+						match = pattern;
+						break;
+					}
+				}
+
+				if (match != null) {
+					Map<String, String> variables = pathMatcher.extractUriTemplateVariables(match, host);
+					ServerWebExchangeUtils.putUriTemplateVariables(exchange, variables);
+					return true;
+				}
+
 				return false;
 			}
 

spring-cloud-gateway-server/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -418,6 +418,12 @@
       "type": "java.lang.Boolean",
       "description": "If Micrometer Observability support should be turned on.",
       "defaultValue": "true"
+    },
+    {
+      "name": "spring.cloud.gateway.predicate.host.include-port",
+      "type": "java.lang.Boolean",
+      "description": "Include the port in matching the host name.",
+      "defaultValue": "true"
     }
   ]
 }

spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/handler/predicate/HostRoutePredicateFactoryTests.java

@@ -21,6 +21,7 @@ import java.util.function.Predicate;
 
 import org.junit.jupiter.api.Test;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.SpringBootConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
@@ -41,6 +42,9 @@ import static org.springframework.boot.test.context.SpringBootTest.WebEnvironmen
 @DirtiesContext
 public class HostRoutePredicateFactoryTests extends BaseWebClientTests {
 
+	@Autowired
+	private HostRoutePredicateFactory hostPredicate;
+
 	@Test
 	public void hostRouteWorks() {
 		expectHostRoute("www.example.org", "host_example_to_httpbin");
@@ -76,7 +80,11 @@ public class HostRoutePredicateFactoryTests extends BaseWebClientTests {
 
 	@Test
 	public void sameHostWithPort() {
-		expectHostRoute("hostpatternarg.org:8080", "without_pattern");
+		expectHostRoute("hostpatternarg.org:8080", "host_with_port_pattern");
+
+		hostPredicate.setIncludePort(false);
+		expectHostRoute("hostpatternarg.org:8080", "host_without_port_pattern");
+		hostPredicate.setIncludePort(true);
 	}
 
 	@Test

spring-cloud-gateway-server/src/test/resources/application.yml

@@ -216,7 +216,15 @@ spring:
 
 
         # =====================================
-      - id: without_pattern
+      - id: host_with_port_pattern
+        uri: ${test.uri}
+        predicates:
+          - name: Host
+            args:
+              pattern: 'hostpatternarg.org:8080'
+
+        # =====================================
+      - id: host_without_port_pattern
         uri: ${test.uri}
         predicates:
           - name: Host