improve gf server for routes check while starting

.example/database/gdb/mysql/gdb_pool.go

@@ -8,9 +8,6 @@ import (
 
 func main() {
 	db := g.DB()
-	db.SetMaxIdleConnCount(10)
-	db.SetMaxOpenConnCount(10)
-	db.SetMaxConnLifetime(time.Minute)
 
 	// 开启调试模式，以便于记录所有执行的SQL
 	db.SetDebug(true)
@@ -19,7 +16,7 @@ func main() {
 		for i := 0; i < 10; i++ {
 			go db.Table("user").All()
 		}
-		time.Sleep(time.Second)
+		time.Sleep(time.Millisecond * 100)
 	}
 
 }

net/ghttp/ghttp_server.go

@@ -267,11 +267,6 @@ func (s *Server) Start() error {
 		return errors.New("[ghttp] server is already running")
 	}
 
-	// If there's no route registered  and no static service enabled,
-	// it then returns an error of invalid usage of server.
-	if len(s.routesMap) == 0 && !s.config.FileServerEnabled {
-		return errors.New(`[ghttp] there's no route set or static feature enabled, did you forget import the router?`)
-	}
 	// Logging path setting check.
 	if s.config.LogPath != "" {
 		if err := s.config.Logger.SetPath(s.config.LogPath); err != nil {
@@ -316,6 +311,12 @@ func (s *Server) Start() error {
 	// Check the group routes again.
 	s.handlePreBindItems()
 
+	// If there's no route registered  and no static service enabled,
+	// it then returns an error of invalid usage of server.
+	if len(s.routesMap) == 0 && !s.config.FileServerEnabled {
+		return errors.New(`[ghttp] there's no route set or static feature enabled, did you forget import the router?`)
+	}
+
 	// Start the HTTP server.
 	reloaded := false
 	fdMapStr := genv.Get(gADMIN_ACTION_RELOAD_ENVKEY)