FIX login page fails when server non http/s ports

[quorauk]

resolves #13

[der]

This could be appropriate for some specific deployments but it depends on the front end proxy configuration. In particular the report for the request at it arrives at tomcat may or may not be the same as the external port depending on connector used (ajp or http) and may or may not be rewritten by the proxy.

I suspect the only robust solution would be some explicit configuration, e.g. in the config part of app.conf.