I'm trying to set a web service that needs the user's Google Latitude info, so I'm using Google OAuth to get the user authorization stuff.
However, when trying to set the redirection URI in the Google APIs Console for a web application client ID I get a message error if I try to set it to 'http://PUBLIC_IP/'.
I need to test it with non local users (thus localhost can't be used), so I would like to know if having a web domain is mandatory in order to use Google's OAuth. If not, how can I solve this issue?
This is not currently supported. I filed a feature request and will update on progress.
Update: Essential app verification activities have continued to make support of IP address-based apps unlikely. These verification activities are necessary to provide protections against abuse of user accounts. In addition, the cost of setting up dedicated domains has been reduced significantly since this feature was requested. Please read other responses here about possible options.