http.go
func (req *Request) SetRequestURI(requestURI string) {
	req.Header.SetRequestURI(requestURI)
	req.parsedURI = false
}
func (req *Request) SetRequestURI(requestURI string) {
	req.Header.SetRequestURI(requestURI)
	req.parsedURI = false
}
// SetRequestURI sets RequestURI.