parsing logic from: https://www.dabeaz.com/ply/example.html
curl http://localhost:8080/api?op=2+7 # json answer
curl -d "2+9" -X POST http://localhost:8080/api
curl http://calc.kandek.com:8080/api?op=2+7 # json answer
curl -d "2+9" -X POST http://calc.kandek.com:8080/api
browse to local:8080 for form interface
I use it a lot for demos: python development -> docker -> kubernetes -> tracing