Websockets errors with Ingress Nginx

Question

When I try to establish connection from browser to my api. I got an error in browser **[Error] WebSocket connection to 'wss://myhost.com/socket.io/?EIO=4&transport=websocket' failed: There was a bad response from the server.**

Also in ingress logs I found the next errors: **[error] 2509#2509: *20476405 upstream prematurely closed connection while reading response header from upstream, client: 169.150.247.39, server: myhost.com, request: "GET /socket.io/?EIO=4&transport=websocket HTTP/1.1", upstream: "http://my-ip:4000/socket.io/?EIO=4&transport=websocket", host: "myhost.com"**

I'm using AWS EKS, + for Load Balancer type is classic. With long poling it was ok, but I want to connect with websockets only. I have the following Ingress configuration.

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-ingress-ingress-nginx-controller
  namespace: default
data:
  use-proxy-protocol: "true"
  use-forwarded-headers: "true"
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-be
  namespace: default
  annotations:
    nginx.ingress.kubernetes.io/use-regex: "true"
    nginx.ingress.kubernetes.io/rewrite-target: /$1
    nginx.ingress.kubernetes.io/ssl-passthrough: 'true'
    nginx.ingress.kubernetes.io/backend-protocol: 'HTTPS'
    nginx.ingress.kubernetes.io/enable-websocket: "true"
    nginx.org/websocket-services: backend
    nginx.ingress.kubernetes.io/configuration-snippet: |
      if ($http_x_real_ip) {
          set $real_ip $http_x_real_ip;
      }
      proxy_set_header X-Real-IP $real_ip;
    nginx.ingress.kubernetes.io/server-snippet: |
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;

spec:
  ingressClassName: nginx
  tls:
  - hosts:
    - myhost.com
    secretName: secret-tls
  rules:
  - host: myhost.com
    http:
      paths:
      - path: /api/(.*)
        pathType: ImplementationSpecific
        backend:
          service:
            name: backend
            port:
              number: 4000
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-socket-io
  namespace: default
  annotations:
    nginx.ingress.kubernetes.io/ssl-passthrough: 'true'
    nginx.org/websocket-services: backend
    nginx.ingress.kubernetes.io/proxy-read-timeout: '3600'
    nginx.ingress.kubernetes.io/proxy-send-timeout: '3600'
    nginx.ingress.kubernetes.io/enable-websocket: "true"
    nginx.ingress.kubernetes.io/server-snippet: |
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $host;

      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
spec:
  ingressClassName: nginx
  tls:
  - hosts:
    - myhost.com
    secretName: secret-tls
  rules:
  - host: myhost.com
    http:
      paths:
      - path: /socket.io/
        pathType: ImplementationSpecific
        backend:
          service:
            name: backend
            port:
              number: 4000
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-fe
  namespace: default
  annotations:
    nginx.ingress.kubernetes.io/auth-type: basic
    nginx.ingress.kubernetes.io/auth-secret: ingress-basic-auth
    nginx.ingress.kubernetes.io/auth-realm: 'Authentication Required'
spec:
  ingressClassName: nginx
  tls:
  - hosts:
    - myhost.com
    secretName: secret-tls
  rules:
  - host: myhost.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: frontend
            port:
              number: 3000

I tried to add timeouts and nginx.org/websocket-services: backend but it didn't work as well