scoket.io sends the opcode -1 on front end and disconnects the client

I have two ec2 instances and they are connected via aws Application load balancer. And my nginx configuration for the socket is as follows:

location ~* \.io {
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header Host $http_host;
  proxy_set_header X-NginX-Proxy true;

  proxy_pass http://localhost:3000;
  proxy_redirect off;

  proxy_http_version 1.1;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "upgrade";
}

Now here what happens is , the moment client tries to connect , it gives opcode -1 and disconnects it.

and it also gives me 400 bad reqeust for the url ws://url.com/socket.io/?EIO=3&transport=websocket&sid=3qrukUCAjUPKRBlfAAAn