zero
  **FEATURE_EXTENDED_EVENTS**           'EXTENDED_EVENTS' optional feature
  **FEATURE_VERBOSE_NAMES**             'VERBOSE_NAMES' optional feature
  **GETINFO_CONFIG_TEXT**               'GETINFO config-text' query
  **GETINFO_GEOIP_AVAILABLE**           'GETINFO ip-to-country/ipv4-available' query and its ipv6 counterpart
  **GETINFO_MICRODESCRIPTORS**          'GETINFO md/all' query
  **GETINFO_UPTIME**                    'GETINFO uptime' query
  **HIDDEN_SERVICE_V3**                 Support for v3 hidden services
  **HSFETCH**                           HSFETCH requests
  **HSFETCH_V3**                        HSFETCH for version 3 hidden services
  **HSPOST**                            HSPOST requests
  **ADD_ONION**                         ADD_ONION and DEL_ONION requests
  **ADD_ONION_BASIC_AUTH**              ADD_ONION supports basic authentication
  **ADD_ONION_NON_ANONYMOUS**           ADD_ONION supports non-anonymous mode
  **ADD_ONION_MAX_STREAMS**             ADD_ONION support for MaxStreamsCloseCircuit
  **LOADCONF**                          LOADCONF requests
  **MICRODESCRIPTOR_IS_DEFAULT**        Tor gets microdescriptors by default rather than server descriptors
  **SAVECONF_FORCE**                    Added the 'FORCE' flag to SAVECONF
  **TAKEOWNERSHIP**                     TAKEOWNERSHIP requests
  **TORRC_CONTROL_SOCKET**              'ControlSocket <path>' config option
  **TORRC_PORT_FORWARDING**             'PortForwarding' config option
  **TORRC_DISABLE_DEBUGGER_ATTACHMENT** 'DisableDebuggerAttachment' config option
  **TORRC_VIA_STDIN**                   Allow torrc options via 'tor -f -' (:trac:`13865`)
  **ONION_SERVICE_AUTH_ADD**            For adding ClientAuthV3 to a v3 onion service via ADD_ONION
  ===================================== ===========
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