040000 tree ab6af478f01011328f82b7957e4691d12fc207e1	caching
040000 tree 0b9c20488d088a6f8e759fa8ae84133045aee297	compression
040000 tree a42332998535f0b1ab07ee401fac0513b3d1239f	logging
040000 tree 948978f5bb00b8bcd42481d67949cf71ea07c87f	post