def _if_unmodified_since_passes(last_modified, if_unmodified_since):
 return (last_modified and (last_modified <= if_unmodified_since))

def _if_unmodified_since_passes ( last_modified , if_unmodified_since ) : return ( last_modified and ( last_modified <= if_unmodified_since ) )
test the if-unmodified-since comparison as defined in section 3 .