I am referring to #404 when I asked for colons to be removed from unsafe characters.
A customer now referenced the rfc, it states only the query component MAY be encoded.

I think the check is too harsh because it MAY be encoded.
Also the protocol part :// does not require encoding.

First request is: the test should only issue a warning and not raise an exception.
Second it should only check the query component.

http://tools.ietf.org/html/rfc6749#section-3.1.2