[STD23]    Internet Standard 23,
              <https://www.rfc-editor.org/info/std23>.
              At the time of writing, this STD comprises the following:

              Postel, J., "Quote of the Day Protocol", STD 23, RFC 865,
              DOI 10.17487/RFC0865, May 1983,
              <https://www.rfc-editor.org/info/rfc865>.