https://codocs.y-js.org/ websockets blocked by CORS policy

[peter-hartmann]

When visiting https://codocs.y-js.org/ using Chrome browser Version 65.0.3325.181 (Official Build) (64-bit) I'm getting the error shown below in the dev console:

Failed to load https://y-websockets-server-karpclbnxp.now.sh/socket.io/?EIO=3&transport=polling&t=MAoVTsQ: Redirect from 'https://y-websockets-server-karpclbnxp.now.sh/socket.io/?EIO=3&transport=polling&t=MAoVTsQ' to 'https://zeit.co/deployments/y-websockets-server-karpclbnxp.now.sh?redirect=1' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://codocs.y-js.org' is therefore not allowed access.

Browsers Affected

• Chrome CORS issue
• Firefox CORS issue
• Safari didn't try
• Edge shows another error: ReferenceError: 'BroadcastChannel' is not defined