Is there a way of invoking wget that produces no output if the operation
is successful (let's assuming that I'm fetching exactly one URL) and
produces appropriate error messages if it is not?

I would have thought this was easy, but I can't figure out how to do
it.  Even redirecting stdout to null doesn't work, since wget sends a
final success message to stderr:

    2017-08-09 22:00:39 URL: [99643] -> 
"calvinandhobbes.4" [1]


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