update serverjs for cors

server.js

@@ -3,7 +3,14 @@ var app = express();
 var multer = require('multer')
 var cors = require('cors');
 
-app.use(cors())
+var corsOptions = {
+    "origin": "*",
+    "methods": "GET,HEAD,PUT,PATCH,POST,DELETE",
+    "preflightContinue": false,
+    "optionsSuccessStatus": 204
+}
+
+app.use(cors(corsOptions));
 
 var storage = multer.diskStorage({
     destination: function(req, file, cb) {