Fix middlewares getting overwritten

router.go

@@ -136,7 +136,11 @@ func (r *Router) getHttpr() *httprouter.Router {
 			handle = handlePOST(r, v.Handle)
 		}
 
-		httpr.Handle(v.Method, v.Path, handleReq(r, handle, append(r.middleware, v.Middleware...)))
+		middleware := make([]Middleware, len(r.middleware)+len(v.Middleware))
+		copy(middleware, r.middleware)
+		copy(middleware[len(r.middleware):], v.Middleware)
+
+		httpr.Handle(v.Method, v.Path, handleReq(r, handle, middleware))
 	}
 
 	httpr.NotFound = http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {