How to set multiple domains ?

I tried

```javascript
app.use(cors({
origin: function (ctx) {
if (['https://www.example1.com', 'https://www.example2.com'].includes(ctx.get('Origin'))) {
return ctx.get('Origin');
}
return null;
}
}));
```

But it doesn't work, any solution ?

Start by reproducing the JavaScript CORS middleware configuration shown in the issue and inspect the repository's middleware entry point and usage documentation. Confirm how the origin callback handles the two listed domains and identify what must change for both origins to be accepted.

Written by the indexing model from the issue text.