[server] fix : allow methods access

api/server.js

@@ -36,6 +36,7 @@ app.use(express.json());
 app.use(function(req, res, next) {
   res.header("Access-Control-Allow-Origin", "*");
   res.header("Access-Control-Allow-Headers", "*");
+  res.header("Access-Control-Allow-Methods", "POST, GET, PUT, DELETE");
   next();
 });