Hi, I followed your instructions but I got an header error: Access to XMLHttpRequest at 'http://localhost:3000/socket.io/?EIO=3&transport=polling&t=NOVPFgq' from origin 'http://127.0.0.1:51264' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Why ? :(