/// Returns `true` if `url`'s host equals `domain` or is a subdomain of it.
pub(super)fnhost_matches_domain(url:&str, domain:&str)->bool{url::Url::parse(url).ok().and_then(|u|{
u.host_str().map(|h|h == domain || h.ends_with(&format!(".{domain}")))}).unwrap_or(false)}