REST API
GET /users -- list of users -- 200, 404, 500 GET /users/:id -- user by id -- 200, 404, 500 POST /users/:id -- create user -- 201, 4xx, Header Location: url PUT /users/:id -- fully update user -- 204/200, 404, 400, 500 PATCH /users/:id -- partially update user -- 204/200, 404, 400, 500 DELETE /users/:id -- partially update user -- 200/200, 404, 400, 500