func (h *ResponseHeader) Header() []byte {
	h.bufKV.value = h.AppendBytes(h.bufKV.value[:0])
	return h.bufKV.value
}
func (h *ResponseHeader) Header() []byte {
	h.bufKV.value = h.AppendBytes(h.bufKV.value[:0])
	return h.bufKV.value
}
// Header returns response header representation.
//
// The returned value is valid until the next call to ResponseHeader methods.