diff --git a/examples/getting-started/any-method/main.go b/examples/getting-started/any-method/main.go
index 80fa9162..7e67d517 100644
--- a/examples/getting-started/any-method/main.go
+++ b/examples/getting-started/any-method/main.go
@@ -27,6 +27,7 @@ import (
 	"github.com/caicloud/nirvana/config"
 	"github.com/caicloud/nirvana/definition"
 	"github.com/caicloud/nirvana/log"
+	"github.com/caicloud/nirvana/service"
 )
 
 func main() {
@@ -48,7 +49,7 @@ func main() {
 				{
 					Method:   definition.Any,
 					Consumes: []string{definition.MIMEAll},
-					Produces: []string{definition.MIMEAll},
+					Produces: []string{definition.MIMEText},
 					Function: func(ctx context.Context) (string, error) {
 						return "hello", nil
 					},
@@ -64,7 +65,7 @@ func main() {
 					Method:   definition.Any,
 					Consumes: []string{definition.MIMEAll},
 					Produces: []string{definition.MIMEAll},
-					Handler:  httputil.NewSingleHostReverseProxy(rpURL),
+					Function: service.WrapHTTPHandler(httputil.NewSingleHostReverseProxy(rpURL)),
 				},
 			},
 		},
diff --git a/examples/getting-started/handler/main.go b/examples/getting-started/handler/main.go
new file mode 100644
index 00000000..0c9cc6cd
--- /dev/null
+++ b/examples/getting-started/handler/main.go
@@ -0,0 +1,82 @@
+/*
+Copyright 2020 Caicloud Authors
+
+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 main
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"net/http/httputil"
+	"net/url"
+
+	"github.com/caicloud/nirvana/config"
+	"github.com/caicloud/nirvana/definition"
+	"github.com/caicloud/nirvana/log"
+	"github.com/caicloud/nirvana/middlewares/reqlog"
+	"github.com/caicloud/nirvana/service"
+)
+
+func main() {
+	backendServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, "this call was relayed by the reverse proxy")
+	}))
+	defer backendServer.Close()
+
+	rpURL, err := url.Parse(backendServer.URL)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	descriptors := []definition.Descriptor{
+		{
+			Path:        "/",
+			Description: "hello API",
+			Definitions: []definition.Definition{
+				{
+					Method:   definition.Get,
+					Consumes: []string{definition.MIMEAll},
+					Produces: []string{definition.MIMEJSON},
+					Function: func(ctx context.Context) (string, error) {
+						return "hello", nil
+					},
+					Results: definition.DataErrorResults(""),
+				},
+			},
+		},
+		{
+			Path:        "/proxy",
+			Description: "proxy API",
+			Middlewares: []definition.Middleware{
+				reqlog.Default(),
+			},
+			Definitions: []definition.Definition{
+				{
+					Method:   definition.Get,
+					Consumes: []string{definition.MIMEAll},
+					Produces: []string{definition.MIMEAll},
+					Function: service.WrapHTTPHandler(httputil.NewSingleHostReverseProxy(rpURL)),
+				},
+			},
+		},
+	}
+
+	cmd := config.NewDefaultNirvanaCommand()
+	if err = cmd.Execute(descriptors...); err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/hack/verify_boilerplate.py b/hack/verify_boilerplate.py
index 518e0528..4f9fda3b 100755
--- a/hack/verify_boilerplate.py
+++ b/hack/verify_boilerplate.py
@@ -154,7 +154,7 @@ def get_regexs():
     # Search for "YEAR" which exists in the boilerplate, but shouldn't in the real thing
     regexs["year"] = re.compile('YEAR')
     # dates can be 2017 or 2018, company holder names can be anything
-    regexs["date"] = re.compile('(2017|2018)')
+    regexs["date"] = re.compile('(2017|2018|2019|2020)')
     # strip // +build \n\n build constraints
     regexs["go_build_constraints"] = re.compile(r"^(// \+build.*\n)+\n", re.MULTILINE)
     # strip #!.* from shell/python scripts
diff --git a/service/executor.go b/service/executor.go
index af98e98d..ea4d2aaf 100644
--- a/service/executor.go
+++ b/service/executor.go
@@ -20,6 +20,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"net/http"
 	"path"
 	"reflect"
 	"runtime"