Very often the .to server returns a partial response, which is a response containing an empty line. It seems to be a very poorly-designed throttle mechanism.

@return [Boolean]

@see Whois::Record::Parser::Base#response_incomplete?

# File lib/whois/record/parser/whois.tonic.to.rb, line 86
def response_incomplete?
  content_for_scanner.strip == ""
end