lb.snip6.go

// isAlive checks whether a backend is Alive by establishing a TCP connection
func isBackendAlive(u *url.URL) bool {
  timeout := 2 * time.Second
  conn, err := net.DialTimeout("tcp", u.Host, timeout)
  if err != nil {
    log.Println("Site unreachable, error: ", err)
    return false
  }
  _ = conn.Close() // close it, we dont need to maintain this connection
  return true
}