Getting blocked by CORS on the DFO gateway handshake. Next.js 14 app, server components. Script loads, but the initial POST to https://webchat.niceincontact.com fails with net::ERR_FAILED.
Access to fetch at 'https://webchat.niceincontact.com/api/v1/...' from origin 'https://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Is this a known limitation with RSC or do I need a proxy? Widget init code is standard.
CORS errors on the NICE CXone webchat gateway usually point to a misconfiguration in the Messaging Settings rather than a Next.js server-side issue. The widget runs client-side, so RSCs shouldn’t impact the handshake directly. Check your Messaging Settings in CXone Admin. Ensure the domain localhost:3000 is explicitly listed under Allowed Origins. If you’re testing locally, you might need to add http://localhost:3000 specifically, not just the bare hostname.
Also, verify the script tag isn’t being intercepted by a middleware that strips headers. Here’s a quick check using curl to see if the gateway responds with the correct headers:
curl -I -H "Origin: http://localhost:3000" https://webchat.niceincontact.com/api/v1/gateway/handshake
If you don’t see Access-Control-Allow-Origin: http://localhost:3000 in the response, the origin isn’t whitelisted. Add it and wait a minute for propagation. Don’t forget to clear your browser cache.