code: func (u *HealthCheck) Start() {
  	for i, h := range u.Hosts {
  		u.Hosts[i].CheckURL = u.normalizeCheckURL(h.Name)
  	}
  
  	u.stop = make(chan struct{})
  	if u.Path != "" {
  		u.wg.Add(1)
  		go func() {
  			defer u.wg.Done()
  			u.healthCheckWorker(u.stop)
  		}()
  	}
  }
docs: // Start starts the healthcheck