fix:http server start panic when use Endpoint (#1492)

transport/http/server.go

@@ -91,13 +91,6 @@ func ErrorEncoder(en EncodeErrorFunc) ServerOption {
 	}
 }
 
-// Endpoint with server endpoint.
-func Endpoint(endpoint *url.URL) ServerOption {
-	return func(o *Server) {
-		o.endpoint = endpoint
-	}
-}
-
 // TLSConfig with TLS config.
 func TLSConfig(c *tls.Config) ServerOption {
 	return func(o *Server) {
@@ -227,9 +220,6 @@ func (s *Server) filter() mux.MiddlewareFunc {
 //   http://127.0.0.1:8000?isSecure=false
 func (s *Server) Endpoint() (*url.URL, error) {
 	s.once.Do(func() {
-		if s.endpoint != nil {
-			return
-		}
 		lis, err := net.Listen(s.network, s.address)
 		if err != nil {
 			s.err = err

transport/http/server_test.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net/http"
-	"net/url"
 	"strings"
 	"testing"
 	"time"
@@ -201,15 +200,6 @@ func TestLogger(t *testing.T) {
 	// todo
 }
 
-func TestEndpoint(t *testing.T) {
-	u, err := url.Parse("http://hello/world")
-	assert.NoError(t, err)
-	o := &Server{}
-	Endpoint(u)(o)
-	assert.Equal(t, "hello", o.endpoint.Host)
-	assert.Equal(t, "http", o.endpoint.Scheme)
-}
-
 func TestMiddleware(t *testing.T) {
 	o := &Server{}
 	v := []middleware.Middleware{