clean examples (#1041)

* clean examples

app.go

@@ -49,11 +49,6 @@ func New(opts ...Option) *App {
 
 // Run executes all OnStart hooks registered with the application's Lifecycle.
 func (a *App) Run() error {
-	a.log.Infow(
-		"service_id", a.opts.id,
-		"service_name", a.opts.name,
-		"service_version", a.opts.version,
-	)
 	instance, err := a.buildInstance()
 	if err != nil {
 		return err

examples/metadata/client/main.go

@@ -30,8 +30,12 @@ func callHTTP() {
 		panic(err)
 	}
 	client := helloworld.NewGreeterHTTPClient(conn)
-	md := metadata.New(map[string][]string{"kratos-extra": {"2233"}})
-	reply, err := client.SayHello(context.Background(), &helloworld.HelloRequest{Name: "kratos"}, http.Metadata(md))
+	md := metadata.Metadata{"kratos-extra": "2233"}
+	reply, err := client.SayHello(context.Background(),
+		&helloworld.HelloRequest{Name: "kratos"},
+		// call options
+		http.Metadata(md),
+	)
 	if err != nil {
 		log.Fatal(err)
 	}

examples/ws/main.go

@@ -5,7 +5,7 @@ import (
 
 	"github.com/go-kratos/kratos/examples/ws/handler"
 	"github.com/go-kratos/kratos/v2"
-	transhttp "github.com/go-kratos/kratos/v2/transport/http"
+	"github.com/go-kratos/kratos/v2/transport/http"
 	"github.com/gorilla/mux"
 )
 
@@ -13,7 +13,7 @@ func main() {
 	router := mux.NewRouter()
 	router.HandleFunc("/ws", handler.WsHandler)
 
-	httpSrv := transhttp.NewServer(transhttp.Address(":8080"))
+	httpSrv := http.NewServer(http.Address(":8080"))
 	httpSrv.HandlePrefix("/", router)
 
 	app := kratos.New(