0-example.js

const Koa = require('koa')
const next = require('next')
const Router = require('koa-router')

const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()

app.prepare()
.then(() => {
  const server = new Koa()
  const router = new Router()

  router.get('/a', async ctx => {
    await app.render(ctx.req, ctx.res, '/b', ctx.query)
    ctx.respond = false
  })

  router.get('/b', async ctx => {
    await app.render(ctx.req, ctx.res, '/a', ctx.query)
    ctx.respond = false
  })

  router.get('*', async ctx => {
    await handle(ctx.req, ctx.res)
    ctx.respond = false
  })

  server.use(async (ctx, next) => {
    ctx.res.statusCode = 200
    await next()
  })

  server.use(router.routes())
  server.listen(3000, (err) => {
    if (err) throw err
    console.log('> Ready on http://localhost:3000')
  })
})

1-my-server.js

const zlib = require('zlib')

const Koa = require('koa')
const Router = require('koa-router')
const koaBodyparser = require('koa-bodyparser')
const koaCompress = require('koa-compress')
const koaConvert = require('koa-convert')
const koaErrorHandler = require('koa-errorhandler')
const koaHelmet = require('koa-helmet')
const koaLogger = require('koa-logger')
const koaPassport = require('koa-passport')
const koaPing = require('koa-ping')
const koaRedis = require('koa-redis')
const koaResponseTime = require('koa-response-time')
const koaSession = require('koa-generic-session')
const koaStatic = require('koa-static')
const log = require('loglevel')
const next = require('next')

const {
  NODE_ENV,
  REDIS_HOST,
  REDIS_PORT,
  APP_HOST,
  APP_PORT,
  APP_KEYS,
} = process.env

if (NODE_ENV === 'develop') {
  log.setLevel('debug')
}


const nextApp = next({
  dev: process.env.NODE_ENV !== 'production',
})
const handleRequest = nextApp.getRequestHandler()


nextApp
  .prepare()
  .then(() => {
    const router = new Router()

    router.get('*', (ctx) => {
      handleRequest(ctx.req, ctx.res)
      ctx.respond = false
    })

    const app = new Koa()
    app.keys = [APP_KEYS.split(',')]

    // Hook to convert old Koa.js middleware
    const oldUse = app.use
    app.use = x => oldUse.call(app, koaConvert(x))

    app
      .use(koaPing())
      .use(koaLogger())
      .use(koaErrorHandler())
      .use(koaBodyparser())
      .use(koaSession({
        rolling: true,

        store: koaRedis({
          host: REDIS_HOST,
          port: REDIS_PORT,
        }),
      }))
      .use(koaCompress({
        filter: contentType => /text/i.test(contentType),
        threshold: 2048,
        flush: zlib.Z_SYNC_FLUSH,
      }))

      .use(koaStatic(`${__dirname}/static`))
      .use(koaHelmet())
      .use(koaResponseTime())

      .use(async (ctx, next) => {
        ctx.res.statusCode = 200
        await next()
      })
      .use(router.routes())

      .listen(APP_PORT, APP_HOST, (error) => {
        if (error) {
          throw error
        }

        log.info(`> Ready on http://${APP_HOST}:${APP_PORT}`)
      })
  })