The parsing in the redirects module was simply determining the base host
via trimming off everything up to //, so a BASE_URL like
"http://localhost:3000" will result in the host name "localhost:3000",
which isn't a valid host name.
So the problem here is that BASE_URL_HOST is used for determining
whether the client should be redirected and it's comparing the hostname
of the request object with BASE_URL_HOST.
For example if we have the aforementioned BASE_URL, we get to the
following comparison:
req.hostname !== BASE_URL_HOST
Which expands to:
"localhost" !== "localhost:3000"
So in order to get rid of the port number, we now use url.parse() to get
the right host name.
Signed-off-by: aszlig <aszlig@nix.build>
