anchor.diff:  		Result :: {ok, Users} | {error, Reason},
   		Users :: list(),
   		Reason :: term().
  +%% @doc List HTTP users.
   %% @equiv  mod_auth:list_users(Address, Port, Dir)
   list_users() ->
   	{Port, Address, Dir, _} = get_params(),
  
positive.code: 		Username :: string(),
  		Result :: true | {error, Reason},
  		Reason :: term().
  %% @doc Delete an existing user.
  delete_user(Username) ->
  	{Port, Address, Dir, GroupName} = get_params(),
  	case mod_auth:delete_user(Username, Address, Port, Dir) of
  
negative.code: 		Result :: {ok, User} | {error, Reason},
  		User :: #httpd_user{},
  		Reason :: term().
  %% @doc Get an HTTP user record.
  %% @equiv mod_auth:get_user(Username, Address, Port, Dir)
  get_user(Username) ->
  	{Port, Address, Dir, _} = get_params(),
  