$ curl 127.0.0.1:8080/ping
reused times: 0
reused times: 1

$ curl 127.0.0.1:8080/ping
reused times: 2
reused times: 3

$ curl 127.0.0.1:8080/pong
reused times: 4

$ curl 127.0.0.1:8080/pong
reused times: 5

$ curl 127.0.0.1:8080/ping
reused times: 6
reused times: 7

$ curl 127.0.0.1:8080/pong
reused times: 8

$ curl 127.0.0.1:8080/ping
reused times: 9
reused times: 10

$ curl 127.0.0.1:8080/pong
reused times: 11

$ curl 127.0.0.1:8080/ping
reused times: 12
reused times: 13