Function resolve_object 

pub fn resolve_object(source: &Url, relative: Url) -> Url

Port of Url.prototype.resolveObject (lib/url.js): resolve relative (already parsed with slashesDenoteHost) against source.

This is NOT RFC 3986 resolution and was never meant to be: it carries the parsed fields across, so the scheme and host come out lowercased and punycoded by parse, an empty port disappears, and a non-slashed protocol (mailto:) lets .. crawl into the host. Each quirk below is node’s.