diff --git a/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/feign/RouterLabelFeignInterceptor.java b/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/feign/RouterLabelFeignInterceptor.java
index a8d2a5659..ef4ac450f 100644
--- a/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/feign/RouterLabelFeignInterceptor.java
+++ b/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/feign/RouterLabelFeignInterceptor.java
@@ -116,6 +116,10 @@ public class RouterLabelFeignInterceptor implements RequestInterceptor, Ordered
 		}
 
 		// pass label by header
+		if (escapeLabels.size() == 0) {
+			requestTemplate.header(RouterConstants.ROUTER_LABEL_HEADER);
+			return;
+		}
 		requestTemplate.header(RouterConstants.ROUTER_LABEL_HEADER, JacksonUtils.serialize2Json(escapeLabels));
 	}
 
diff --git a/spring-cloud-tencent-examples/polaris-router-grayrelease-example/router-grayrelease-gateway/src/main/java/com/tencent/cloud/polaris/router/grayrelease/gateway/GatewayController.java b/spring-cloud-tencent-examples/polaris-router-grayrelease-example/router-grayrelease-gateway/src/main/java/com/tencent/cloud/polaris/router/grayrelease/gateway/GatewayController.java
index 1486d334c..e7ac65ba9 100644
--- a/spring-cloud-tencent-examples/polaris-router-grayrelease-example/router-grayrelease-gateway/src/main/java/com/tencent/cloud/polaris/router/grayrelease/gateway/GatewayController.java
+++ b/spring-cloud-tencent-examples/polaris-router-grayrelease-example/router-grayrelease-gateway/src/main/java/com/tencent/cloud/polaris/router/grayrelease/gateway/GatewayController.java
@@ -18,9 +18,14 @@
 
 package com.tencent.cloud.polaris.router.grayrelease.gateway;
 
+import java.util.HashMap;
+import java.util.Map;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.core.env.Environment;
+import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestHeader;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
@@ -34,14 +39,36 @@ public class GatewayController {
 	@Autowired
 	private RouterService routerService;
 
+	private final Map<Integer, String> uidMapping;
+
+	public GatewayController() {
+		String mapping = System.getenv("uid_env_mapping");
+		uidMapping = parseUidMapping(mapping);
+		System.out.println("parsed mapping is " + uidMapping);
+	}
+
 	/**
 	 * Get information of callee.
 	 * @return information of callee
 	 */
-	@GetMapping("/entry")
-	public String rest() {
+	@GetMapping("/route_rule")
+	public String routeRule(@RequestHeader("uid") int userId) {
 		String appName = environment.getProperty("spring.application.name");
-		String resp = routerService.rest();
+		String resp = routerService.restByUser(userId);
 		return appName + " -> " + resp;
 	}
+
+	private Map<Integer, String> parseUidMapping(String mapText) {
+		Map<Integer, String> result = new HashMap<>();
+		if (!StringUtils.hasText(mapText)) {
+			return result;
+		}
+		String[] tokens = mapText.split("\\|");
+		for (String token : tokens) {
+			String[] pairs = token.split(":");
+			result.put(Integer.parseInt(pairs[0]), pairs[1]);
+		}
+		return result;
+	}
+
 }
diff --git a/spring-cloud-tencent-examples/polaris-router-grayrelease-example/router-grayrelease-gateway/src/main/java/com/tencent/cloud/polaris/router/grayrelease/gateway/RouterService.java b/spring-cloud-tencent-examples/polaris-router-grayrelease-example/router-grayrelease-gateway/src/main/java/com/tencent/cloud/polaris/router/grayrelease/gateway/RouterService.java
index 95f066f8a..23ffb30a0 100644
--- a/spring-cloud-tencent-examples/polaris-router-grayrelease-example/router-grayrelease-gateway/src/main/java/com/tencent/cloud/polaris/router/grayrelease/gateway/RouterService.java
+++ b/spring-cloud-tencent-examples/polaris-router-grayrelease-example/router-grayrelease-gateway/src/main/java/com/tencent/cloud/polaris/router/grayrelease/gateway/RouterService.java
@@ -20,6 +20,7 @@ package com.tencent.cloud.polaris.router.grayrelease.gateway;
 
 import org.springframework.cloud.openfeign.FeignClient;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestHeader;
 
 /**
  * Router callee feign client.
@@ -30,6 +31,5 @@ import org.springframework.web.bind.annotation.GetMapping;
 public interface RouterService {
 
 	@GetMapping("/router/gray/rest")
-	String rest();
-
+	String restByUser(@RequestHeader("uid") int user);
 }
diff --git a/spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/ServiceRuleManager.java b/spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/ServiceRuleManager.java
index 8b3fb16d4..1a0af32b4 100644
--- a/spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/ServiceRuleManager.java
+++ b/spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/ServiceRuleManager.java
@@ -84,6 +84,7 @@ public class ServiceRuleManager {
 
 		ServiceEventKey srcSvcEventKey = new ServiceEventKey(new ServiceKey(namespace, sourceService),
 				ServiceEventKey.EventType.ROUTING);
+		routerKeys.add(srcSvcEventKey);
 
 		DefaultServiceEventKeysProvider svcKeysProvider = new DefaultServiceEventKeysProvider();
 		svcKeysProvider.setSvcEventKeys(routerKeys);