func (h *headerRule) Claim(r *http.Request) bool {
	return h.claim(r.Header.Get)
}
func (h *headerRule) Claim(r *http.Request) bool {
	return h.claim(r.Header.Get)
}
func ( h * headerRule ) Claim ( r * http . Request ) bool { return h . claim ( r . Header . Get ) }
// Claim validator
Claim validator