Kubernetes behind HTTPS proxy

I am trying to connect to the Kubernetes Cluster, which is in a private network. I have HTTPS proxy, using which I can get Kubernetes api, using curl or web browser:

    {
  "kind": "Status",
  "apiVersion": "v1",
  "metadata": {
    
  },
  "status": "Failure",
  "message": "Unauthorized",
  "reason": "Unauthorized",
  "code": 401
}

I have no luck connecting to cluster using kubectl.

1. If I set certificate-authority-data and proxy-url in kubeconfig - I get error:

   Unable to connect to the server: proxyconnect tcp: x509: certificate signed by unknown authority

   That's I believe because I have two self-signed certificates:one on proxy another on Kubernetes. (Btw I've added proxy certificate to my OS and have no errors on browser. But looks like kubectl don't care.)

2. If I set --insecure-skip-tls-verify=true in cli after kubectl ? I get an error in hexadecimal, which I don't know how to convert:

   Unable to connect to the server: malformed HTTP response "\x00\x00\x12\x04\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x80\x00\x04\x00\x01\x00\x00\x00\x05\x00\xff\xff\xff\x00\x00\x04\b\x00\x00\x00\x00\x00\u007f\xff\x00\x00\x00\x00\b\a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"

Any ideas how to connect to Kubernetes cluster behind https proxy?