I’m trying to embed the Genesys Cloud Messenger widget into a React application using Next.js 14 with the App Router. The goal is to track widget interactions as custom events in New Relic for performance monitoring. The widget loads fine in development, but in production, the initial handshake to the Genesys gateway fails with a CORS error.
Here is the setup. I’m using the genesys-cloud-messenger npm package. The component mounts in a client-side layout to avoid SSR issues. The initialization code looks like this:
'use client';
import { Messenger } from 'genesys-cloud-messenger';
export default function ChatWidget() {
useEffect(() => {
Messenger.init({
accountId: 'MY_ACCOUNT_ID',
appId: 'MY_APP_ID',
orgId: 'MY_ORG_ID',
gateway: 'https://gateway-webmessaging.mypurecloud.com',
onReady: () => console.log('Widget ready'),
onError: (error) => console.error('Widget error:', error),
});
}, []);
return <div id="genesys-messenger-container" />;
}
The browser console shows this error when the widget tries to establish the WebSocket connection:
Access to XMLHttpRequest at ‘https://gateway-webmessaging.mypurecloud.com/v1/connections’ from origin ‘https://my-nextjs-app.vercel.app’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
I’ve checked the Genesys Web Messaging configuration in the admin console. The allowed origins list includes https://my-nextjs-app.vercel.app. I’ve also tried adding the origin to the CORS allow list in the Web Messaging app settings specifically. Nothing works. The request headers show the Origin is correct, but the response lacks the necessary CORS headers.
Is there a specific header or configuration step I’m missing for the App Router? I suspect the issue might be related to how Next.js handles static assets or server-side rendering of the script tag, even with 'use client'. Any ideas on how to debug this further?