Added responding w/ 204 for all OPTIONS requests

src/index.js

@@ -20,6 +20,9 @@ app.use((req, res, next) => {
 	res.header('Access-Control-Allow-Headers',  'Origin, X-Requested-With, Accept, Content-Type');
 	res.header('Access-Control-Allow-Methods',  'OPTIONS, HEAD, GET');
 	res.header('Access-Control-Expose-Headers', 'Content-Length');
+	
+	if (req.method === 'OPTIONS') return res.send(204);
+	
 	next();
 });
 app.use(responseTime());