npm install
npm run dev
The server will start at localhost:9100
localhost:9100/first/A => MyHttpHandlerA is called, add is 3
localhost:9100/first/B => MyHttpHandlerB is called, add is -1
localhost:9100/second/C => MyHttpHandlerC is called, add is 2
localhost:9100/second/D => MyHttpHandlerD is called, add is 0.5