Does socket.io supports passing custom cookies with socket.io-client?

[hasitparmar-snyk]

I need help with cookie handling between the socket.io-client and node.js server

Current Setup:

• Client: A HTML page using Socket.IO client (socket.io-client)
• Socket Server: Socket.io server listen and respond to events.
• Proxy server: A Node.js based server using http-proxy to proxy requests from Client to Server, basically Socket server is behind the Proxy server.

What I'm trying to achieve:
I need to access cookies that are set in the Socket.IO client during the WebSocket handshake on my proxy server side.

Socket.io client initialization

io(url, {
      extraHeaders: {
        Cookie: `CookieName=CookieValue;`,
      },
    })

How to access this cookie in proxy server's upgrade event?

proxy.js

server.on('upgrade', (req, socket, head) => {
    proxy.ws(req, socket, head);
});

Let me know if you have any other suggestions for passing cookies from socket.io-client to server, I am open for ideas