Send correct request to calculator (result is 80)

curl -X POST -H "Content-Type:application/json" -d @jsons/multiply.json -v localhost:8000/calculate

Send correct request to calculator (result is 5)

curl -X POST -H "Content-Type:application/json" -d @jsons/div_ok.json -v localhost:8000/calculate

Send request to divide by 0 (response without 'value' field)

curl -X POST -H "Content-Type:application/json" -d @jsons/div_0.json -v localhost:8000/calculate

Send request to do unknown operation (400 response with message about malformed "x")

curl -X POST -H "Content-Type:application/json" -d @jsons/wrong.json -v localhost:8000/calculate

Send request to list multiple directories

curl -v http://localhost:8000/directory\?dir\=target\&dir2\=src/main\&dir3\=.