Account for port numbers in URLs

[ameenmaali]

Probably makes sense to discard ports when assessing for duplication, but account for something like:

https://site.com:443/home
https://site.com/home

[larskraemer]

#17 Also solves this. I think the only place a ':' can occur in a hostname is before the port, so discarding everything after a ':' should work for this.