diff --git a/config/200-bootstrap.yaml b/config/200-bootstrap.yaml
index 1b9665959..ce70dfb3a 100644
--- a/config/200-bootstrap.yaml
+++ b/config/200-bootstrap.yaml
@@ -65,11 +65,11 @@ data:
                           routes:
                             - match:
                                 safe_regex:
-                                  google_re2: {}
                                   regex: '/(certs|stats(/prometheus)?|server_info|clusters|listeners|ready)?'
                                 headers:
                                   - name: ':method'
-                                    exact_match: GET
+                                    string_match:
+                                      exact: GET
                               route:
                                 cluster: service_stats
       clusters:
diff --git a/pkg/envoy/api/headers.go b/pkg/envoy/api/headers.go
index a91d56831..4983328ca 100644
--- a/pkg/envoy/api/headers.go
+++ b/pkg/envoy/api/headers.go
@@ -18,7 +18,6 @@ package envoy
 
 import (
 	core "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
-	"google.golang.org/protobuf/types/known/wrapperspb"
 )
 
 // headersToAdd generates a list of HeaderValueOption from a map of headers.
@@ -36,7 +35,7 @@ func headersToAdd(headers map[string]string) []*core.HeaderValueOption {
 			},
 			// In Knative Serving, headers are set instead of appended.
 			// Ref: https://github.com/knative/serving/pull/6366
-			Append: wrapperspb.Bool(false),
+			AppendAction: core.HeaderValueOption_OVERWRITE_IF_EXISTS_OR_ADD,
 		})
 	}
 
diff --git a/pkg/envoy/api/headers_test.go b/pkg/envoy/api/headers_test.go
index 9acec2ec3..2e3d3048d 100644
--- a/pkg/envoy/api/headers_test.go
+++ b/pkg/envoy/api/headers_test.go
@@ -22,7 +22,6 @@ import (
 
 	core "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
 	"google.golang.org/protobuf/testing/protocmp"
-	"google.golang.org/protobuf/types/known/wrapperspb"
 	"gotest.tools/v3/assert"
 )
 
@@ -50,13 +49,13 @@ func TestHeadersToAdd(t *testing.T) {
 				Key:   "foo",
 				Value: "bar",
 			},
-			Append: wrapperspb.Bool(false),
+			AppendAction: core.HeaderValueOption_OVERWRITE_IF_EXISTS_OR_ADD,
 		}, {
 			Header: &core.HeaderValue{
 				Key:   "baz",
 				Value: "lol",
 			},
-			Append: wrapperspb.Bool(false),
+			AppendAction: core.HeaderValueOption_OVERWRITE_IF_EXISTS_OR_ADD,
 		}},
 	}}
 
diff --git a/pkg/envoy/api/weighted_cluster_test.go b/pkg/envoy/api/weighted_cluster_test.go
index 1a5c35c3c..571528167 100644
--- a/pkg/envoy/api/weighted_cluster_test.go
+++ b/pkg/envoy/api/weighted_cluster_test.go
@@ -38,7 +38,7 @@ func TestNewWeightedCluster(t *testing.T) {
 				Key:   "foo",
 				Value: "bar",
 			},
-			Append: wrapperspb.Bool(false),
+			AppendAction: core.HeaderValueOption_OVERWRITE_IF_EXISTS_OR_ADD,
 		}},
 	}