fix: remove redundant route.Hosts to prevent false diffs in ADC sync

internal/adc/translator/apisixroute.go

@@ -192,7 +192,6 @@ func (t *Translator) buildRoute(ar *apiv2.ApisixRoute, service *adc.Service, rul
 		route.EnableWebsocket = *enableWebsocket
 	}
 	route.FilterFunc = rule.Match.FilterFunc
-	route.Hosts = rule.Match.Hosts
 	route.Methods = rule.Match.Methods
 	route.Plugins = plugins
 	route.Priority = ptr.To(int64(rule.Priority))

internal/adc/translator/apisixroute_test.go

@@ -0,0 +1,84 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package translator
+
+import (
+	"testing"
+
+	"github.com/go-logr/logr"
+	"github.com/stretchr/testify/assert"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	adc "github.com/apache/apisix-ingress-controller/api/adc"
+	apiv2 "github.com/apache/apisix-ingress-controller/api/v2"
+)
+
+func TestBuildRoute_HostsNotSet(t *testing.T) {
+	translator := NewTranslator(logr.Discard())
+
+	ar := &apiv2.ApisixRoute{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "test-route",
+			Namespace: "default",
+		},
+	}
+
+	service := &adc.Service{}
+	rule := apiv2.ApisixRouteHTTP{
+		Name: "rule1",
+		Match: apiv2.ApisixRouteHTTPMatch{
+			Hosts: []string{"example.com", "foo.com"},
+			Paths: []string{"/api/*"},
+		},
+	}
+
+	var enableWebsocket *bool
+	translator.buildRoute(ar, service, rule, nil, nil, nil, &enableWebsocket)
+
+	assert.Len(t, service.Routes, 1)
+	route := service.Routes[0]
+	// route.Hosts should NOT be set — hosts belong on Service, not Route.
+	// Setting hosts on Route causes false diffs in backends that don't
+	// support route-level hosts (e.g., API7 EE).
+	assert.Nil(t, route.Hosts, "route.Hosts should not be set; hosts should only be on Service")
+	assert.Equal(t, []string{"/api/*"}, route.Uris)
+}
+
+func TestBuildService_HostsSet(t *testing.T) {
+	translator := NewTranslator(logr.Discard())
+
+	ar := &apiv2.ApisixRoute{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "test-route",
+			Namespace: "default",
+		},
+	}
+
+	rule := apiv2.ApisixRouteHTTP{
+		Name: "rule1",
+		Match: apiv2.ApisixRouteHTTPMatch{
+			Hosts: []string{"example.com", "foo.com"},
+			Paths: []string{"/api/*"},
+		},
+	}
+
+	service := translator.buildService(ar, rule, 0)
+
+	// service.Hosts SHOULD be set — this is the canonical location for hosts.
+	assert.Equal(t, []string{"example.com", "foo.com"}, service.Hosts)
+}