tespace character, and a list
   that generators use to determine which extended responses are
   supported by a server.

   An extended response is a single line of printable text terminated by
   a new line sequence appropriate for the context of its use. It
   contains two or more tokens that are separated with a single colon
   (':') character. The first token contains a type specifier that
   indicates the format of the rest of the response. The tokens that
   follow are argument data for the OTP exten