app type transition (#7167)

app/app.go

@@ -8,6 +8,16 @@ import (
 	"net/http"
 )
 
+type App struct {
+	Srv *Server
+}
+
+var globalApp App
+
+func Global() *App {
+	return &globalApp
+}
+
 func CloseBody(r *http.Response) {
 	if r.Body != nil {
 		ioutil.ReadAll(r.Body)