header.go
func (h *RequestHeader) SetRequestURIBytes(requestURI []byte) {
	h.requestURI = append(h.requestURI[:0], requestURI...)
}
func (h *RequestHeader) SetRequestURIBytes(requestURI []byte) {
	h.requestURI = append(h.requestURI[:0], requestURI...)
}
// SetRequestURIBytes sets RequestURI for the first HTTP request line.
// RequestURI must be properly encoded.
// Use URI.RequestURI for constructing proper RequestURI if unsure.