header.go
func (h *RequestHeader) DelBytes(key []byte) {
	h.parseRawHeaders()
	h.bufKV.key = append(h.bufKV.key[:0], key...)
	normalizeHeaderKey(h.bufKV.key, h.disableNormalizing)
	h.del(h.bufKV.key)
}
func (h *RequestHeader) DelBytes(key []byte) {
	h.parseRawHeaders()
	h.bufKV.key = append(h.bufKV.key[:0], key...)
	normalizeHeaderKey(h.bufKV.key, h.disableNormalizing)
	h.del(h.bufKV.key)
}
// DelBytes deletes header with the given key.