It seems that typing
domain example.com means "give me this domain only", but just saying "example.com" is a query for things with example.com in them.
With the SRS, if I type
nodejs.geek.nz it returns the details as though it is a domain command like above, but typing
domain nodejs.geek.nz gives
500 Invalid characters in query string.
i.e. either it is not recognised as a valid command or a valid query.
(Note: I'm going off what I see, I'm not sure what it should actually do.)
Does that help?