anchor.diff:  	{ok, RespHeaders, Body};
   get_usagespec("PublicWLANAccessUsageSpec", _Query) ->
   	{error, 400};
  +get_usagespec("HTTPTransferUsageSpec", [] = _Query) ->
  +	RespHeaders = [{content_type, "application/json"}],
  +	Body = mochijson:encode(spec_http_transfer()),
  +	{ok, RespHeaders, Body};
   get_usagespec(_Id, _Query) ->
   	{error, 404}.
   
  
positive.code: 			{ok, RespHeaders, Body};
  		{_, {_, "PublicWLANAccessUsageSpec"}, _} ->
  			{error, 400};
  		false ->
  			{error, 404};
  		_ ->
  
negative.code: %% @doc Body producing function for
  %% 	`GET /usageManagement/v1/usageSpecification'
  %% 	requests.
  %% @todo http transfer usage spec
  get_usagespec([] = _Query) ->
  	RespHeaders = [{content_type, "application/json"}],
  	Body = mochijson:encode({array, [spec_aaa_auth(),
  