backend/middleware/index.js

@@ -1,7 +1,7 @@
 module.exports = function (req, res, next) {
   res.header ('Access-Control-Allow-Origin', '*');
   res.header ('Access-Control-Allow-Headers', 'Origin, Content-Type');
-  res.header ('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
+  res.header ('Access-Control-Allow-Methods', 'GET, POST, PUT');
   res.header ('Access-Control-Allow-Credentials', 'true');
   next ();
 };