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When a user enters an URI without the "http://", Unicorn replies with Critical Error and a stack trace dump. I suggest two possible solutions by order of preferences. 1. Fallback mechanism to add automatically the missing protocol information. Maybe, plus a gentle message like "Please, next time provide http://" 2. A gentle message: "You have not given a complete URI, we need you to add http://" Though it is not very helpful from a usability point of view.
http:// is now automatically appended. Nice messages are displayed if the URI has an unsupported protocol.