fetch/fetch.go
func (p ContinueRequestParams) WithURL(url string) *ContinueRequestParams {
	p.URL = url
	return &p
}
func (p ContinueRequestParams) WithURL(url string) *ContinueRequestParams {
	p.URL = url
	return &p
}
// WithURL if set, the request url will be modified in a way that's not
// observable by page.