anchor.diff:  
   %% @hidden
   usage_http_transfer({Host, User, DateTime, Method, URI, HttpStatus}, Filters) ->
  -	UsageSpec = {struct, [{"id", "HTTPUsageTransferSpec"},
  -			{"href", "/usageManagement/v1/usageSpecification/HTTPUsageTransferSpec"},
  -			{"name", "HTTPUsageTransferSpec"}]},
  -	Type = "HTTPUsageTransfer",
  +	UsageSpec = {struct, [{"id", "HTTPTransferUsageSpec"},
  +			{"href", "/usageManagement/v1/usageSpecification/HTTPTransferUsageSpec"},
  +			{"name", "HTTPTransferUsageSpec"}]},
  +	Type = "HTTPTransferUsage",
   	UsageChars = [{struct, [{"name", "host"}, {"value", Host}]},
   			{struct, [{"name", "user"}, {"value", User}]},
   			{struct, [{"name", "method"}, {"value", Method}]},
  
positive.code: 			query_page1(PageServer, Etag, fun usage_aaa_acct/2, Filters, Start, End);
  		{_, {_, "PublicWLANAccessUsage"}, []} ->
  			{error, 404}; % todo?
  		{_, {_, "HTTPUsageTransfer"}, []} ->
  			query_page1(PageServer, Etag, fun usage_http_transfer/2, Filters, Start, End);
  		{_, {_, _}, []} ->
  			{error, 404};
  
negative.code: 			end;
  		{_, {_, "PublicWLANAccessUsage"}, []} ->
  			{error, 404}; % todo?
  		{_, {_, "HTTPTransferUsage"}, []} ->
  			DateTime = proplists:get_value("datetime", Query, '_'),
  			Host = proplists:get_value("host", Query, '_'),
  			User = proplists:get_value("user", Query, '_'),
  