curl -X POST http://localhost:20010/variety/create \
  -H "Content-Type: application/json" \
  -d '{
    "name": "螺纹钢",
    "code": "RB",
    "tick": 1.0,
    "tick_price": 10.0
  }'


  curl -X POST http://localhost:20010/exchange/create \
  -H "Content-Type: application/json" \
  -d '{
    "name": "1234",
    "code": "ads"
  }'