Simple hello-world type app that shows also request headers, responses and IPs used on the client and server.
$ curl localhost:3000
Hello v1.0 ::ffff:172.17.0.1 from 172.17.0.2
{
"method": "GET",
"url": "/",
"headers": {
"host": "localhost:3000",
"user-agent": "curl/7.51.0",
"accept": "*/*"
},
"ip": "::ffff:172.17.0.1",
"ips": []
}