example for clean arch.
run test => flutter test run app => flutter run
run npm start
use postman to test
get "http://localhost:8080"
post "http://localhost:8080" body:{name:jack,price:202,id:1}
delete "http://localhost:8080" body:{id:1}
put "http://localhost:8080" body:{name:jack,price:202,id:1}