func (h *RequestHeader) SetUserAgentBytes(userAgent []byte) {
	h.parseRawHeaders()
	h.userAgent = append(h.userAgent[:0], userAgent...)
}
func (h *RequestHeader) SetUserAgentBytes(userAgent []byte) {
	h.parseRawHeaders()
	h.userAgent = append(h.userAgent[:0], userAgent...)
}
func ( h * RequestHeader ) SetUserAgentBytes ( userAgent [ ] byte ) { h . parseRawHeaders ( ) h . userAgent = append ( h . userAgent [ : 0 ] , userAgent ... ) }
// SetUserAgentBytes sets User-Agent header value.
SetUserAgentBytes sets User - Agent header value .