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This is my koa app that serves nuxt app.

• if NODE_ENV=production it always serves “OK” and nothing happens on server
• if NODE_ENV=development it always serves “OK” and in server logs I see that app fetches async data and then there is error UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: Can't set headers after they are sent.
• it works with express

import Koa from 'koa'
import { Nuxt, Builder } from 'nuxt'
import config from './../nuxt.config.js'

const app = new Koa()

config.dev = !(process.env.NODE_ENV === 'production')

const nuxt = new Nuxt(config)

if (config.dev) {
  const builder = new Builder(nuxt)
  builder.build()
}

app.use(async (ctx, next) => {
  ctx.status = 200
  await nuxt.render(ctx.req, ctx.res)
})

app.listen(3000)
console.log('Server listening')

Note that following piece of code is exactly the same I used with nuxt 1.0.0-alpha.4

app.use(async (ctx, next) => {
  ctx.status = 200
  await nuxt.render(ctx.req, ctx.res)
})