###增加商品
POST http://localhost:8000/product HTTP/1.1
Content-Type: application/json

{
    "name": "pc001",
    "price": 100.01
}

###查询商品
GET http://localhost:8000/product HTTP/1.1


###删除商品
DELETE http://localhost:8000/product/1 HTTP/1.1


###更新商品
PUT http://localhost:8000/product HTTP/1.1
Content-Type: application/json

{
    "id": 2,
    "name": "pc002",
    "price": 200.02
}