fix fallback envoy version check bug (#441)

Co-authored-by: shiqi wang <shiqi.wang1@huawei.com>
Co-authored-by: 澄潭 <zty98751@alibaba-inc.com>

test/e2e/conformance/tests/httproute-default-backend.go

@@ -0,0 +1,59 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// Licensed 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 tests
+
+import (
+	"testing"
+
+	"github.com/alibaba/higress/test/e2e/conformance/utils/http"
+	"github.com/alibaba/higress/test/e2e/conformance/utils/suite"
+)
+
+func init() {
+	Register(HTTPRouteDefaultBackend)
+}
+
+var HTTPRouteDefaultBackend = suite.ConformanceTest{
+	ShortName:   "HTTPRouteDefaultBackend",
+	Description: "The Ingress in the higress-conformance-infra namespace uses the default backend for fallback",
+	Features:    []suite.SupportedFeature{suite.HTTPConformanceFeature},
+	Manifests:   []string{"tests/httproute-default-backend.yaml"},
+	Test: func(t *testing.T, suite *suite.ConformanceTestSuite) {
+		testcases := []http.Assertion{
+			{
+				Meta: http.AssertionMeta{
+					TargetBackend:   "infra-backend-v1",
+					TargetNamespace: "higress-conformance-infra",
+				},
+				Request: http.AssertionRequest{
+					ActualRequest: http.Request{
+						Path: "/foo",
+					},
+				},
+				Response: http.AssertionResponse{
+					ExpectedResponse: http.Response{
+						StatusCode: 200,
+					},
+				},
+			},
+		}
+
+		t.Run("HTTPRoute fallback default backend", func(t *testing.T) {
+			for _, testcase := range testcases {
+				http.MakeRequestAndExpectEventuallyConsistentResponse(t, suite.RoundTripper, suite.TimeoutConfig, suite.GatewayAddress, testcase)
+			}
+		})
+	},
+}

test/e2e/conformance/tests/httproute-default-backend.yaml

@@ -0,0 +1,32 @@
+# Copyright (c) 2022 Alibaba Group Holding Ltd.
+#
+# Licensed 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.
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: higress-conformance-infra-default-backend
+  namespace: higress-conformance-infra
+  annotations:
+    nginx.ingress.kubernetes.io/default-backend: "infra-backend-v1"
+spec:
+  ingressClassName: higress
+  rules:
+  - http:
+      paths:
+      - pathType: Prefix
+        path: "/foo"
+        backend:
+          service:
+            name: non-existent
+            port:
+              number: 8080