code: func (s *HTTPServer) checkACLDisabled(resp http.ResponseWriter, req *http.Request) bool {
  	if s.agent.delegate.ACLsEnabled() {
  		return false
  	}
  
  	resp.WriteHeader(http.StatusUnauthorized)
  	fmt.Fprint(resp, "ACL support disabled")
  	return true
  }
docs: // checkACLDisabled will return a standard response if ACLs are disabled. This
  // returns true if they are disabled and we should not continue.