Testing out express process exit behavior

express-test.js

'use strict'

const express = require('express')
const app = express()
const http = require('http')

const server = http.createServer(app).listen(9000, () => {
  console.log('debug', 'express started process:', process.pid)

  app.get('/test-1', (req, res, next) => {
    console.log('debug', 'start: 1')
    setTimeout(() => {
      console.log('debug', 'end: 1')
      res.status(200).send('ok')
    }, 4000)
  })

  app.get('/test-2', (req, res, next) => {
    console.log('debug', 'start: 2')
    setTimeout(() => {
      console.log('debug', 'end: 2')
    }, 4000)
    res.status(200).send('ok')
  })
})

process.on('SIGTERM', () => {
  console.log('debug', 'graceful')
  server.close(() => {
    console.log('debug', 'server closed')
    process.exit(0)
  })
})