Websock connection closing abnormally when running inside docker container

[maheshkulkarni4]

I am trying to run the graphqlws inside a docker container. The code is straight forward and if I test locally it works fine. My UI App is able to establish a Websocket connection and receive messages coming from Server.

But when I run inside docker, the path to reach my server is as follows.
Browser -> UI POD (https) -> nginx -> proxy to graphql/Server pod

I have already added the following headers in my Nginx to allow proper traffic

proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "keep-alive, upgrade";
proxy_read_timeout 86400s;
proxy_send_timeout 86400s;
proxy_pass http://graphql;

But still, the following error is thrown immediately

time="2022-08-10T10:40:05Z" level=info msg="Created connection" prefix="graphqlws/connection/d2751293-304b-448c-8e44-0c97f108feec"                                                  ││ time="2022-08-10T10:40:49Z" level=warning msg="Closing connection" prefix="graphqlws/connection/d2751293-304b-448c-8e44-0c97f108feec" reason="websocket: close 1006 (abnormal closu ││ time="2022-08-10T10:41:19Z" level=info msg="Remove subscriptions" conn=d2751293-304b-448c-8e44-0c97f108feec prefix="graphqlws/subscriptions"                                        ││ time="2022-08-10T10:41:21Z" level=info msg="Closed connection" prefix="graphqlws/connection/d2751293-304b-448c-8e44-0c97f108feec"           

• UI is accessing this with wss:// and nginx routes to http:// as its pod to pod traffic
• I tried to Run the Server Application locally and able to access the endpoint on ws:// locally, it works perfectly fine.
• I tried to port-forward the server pod and use connection with ws:// it did not work either. Same error as above is thrown.

Below is the handler implementation

func (g *Handle) NewSubscriptionHandler(kubeconfig, apiHost string, loginHandler login.Handler) http.Handler {
	return graphqlws.NewHandler(graphqlws.HandlerConfig{
		SubscriptionManager: subscription.Manager(),
		Authenticate: func(token string) (interface{}, error) {
                            // Auth code, removed for obvious purpose
		},
	})
}

Could you please advise how to handle or fix this issue ?