Port gets dropped for local URLs

See, how the port `:3000` gets dropped from the URL here:

```
> FinalRedirectUrl.final_redirect_url("http://localhost:3000/items/4c1147ec-78cb-4c5b-9f54-ce55fa2553d2-podcast")
 => "http://localhost/items/4c1147ec-78cb-4c5b-9f54-ce55fa2553d2-podcast" 
 ```