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Hi, I went into trouble when using renderRoute.
The following is what I did:

Env

Mac OS X EI Capitan 10.11.6
Node v7.7.4

5 Simple Steps

1. Download nuxt-koa template

$ vue init nuxt/koa (choose koa v2)

2. Install dependencies

$ yarn

3. Try to run before changing anything, and it works fine

$ npm run dev  # which works fine

4. Change app.js to use renderRoute

// app.js

// ...

// Change the middleware to use renderRoute
app.use(async (ctx, next) => {
  ctx.status = 200 // koa defaults to 404 when it sees that status is unset
  // await nuxt.render(ctx.req, ctx.res)
  const result = await nuxt.renderRoute('/')
  console.log(result.error)
})

5. Run again

$ npm run dev # error is printed

Error Message:

{ statusCode: 500,
  message: 'Cannot read property \'url\' of undefined' }

Am I using renderRoute in a wrong way?
Any idea?
Thanks!