040000 tree 179601619bf09209f970291d965c977fe0cf956b	core
040000 tree f616b32621d82b00995e79d98a412bbc867a24a9	event
040000 tree 022bcd4d6b748c2a4a51ab3ca3c88aaa98dfd3e6	http
040000 tree 99f6598e8077860886b391b426f7fe6598c2ca82	os