Custom Koa Server example
How to use
npx create-next-app --example custom-server-koa custom-server-koa-app # or yarn create next-app --example custom-server-koa custom-server-koa-app
Download the example or clone the repo:
curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/custom-server-koa cd custom-server-koa
Install it and run:
npm install npm run dev # or yarn yarn dev
The idea behind the example
Most of the times the default Next server will be enough but sometimes you want to run your own server to customize routes or other kind of the app behavior. Next provides a Custom server and routing so you can customize as much as you want.
Because the Next.js server is just a node.js module you can combine it with any other part of the node.js ecosystem. in this case we are using Koa to build a custom router on top of Next.
The example shows a server that serves the component living in
pages/a.js when the route
/b is requested and
pages/b.js when the route
/a is accessed. This is obviously a non-standard routing strategy. You can see how this custom routing is being made inside
Side note: Enabling gzip compression
The most common Koa middleware for handling the gzip compression is compress, but unfortunately it is currently not compatible with Next.
koa-compress handles the compression of the response body by checking
res.body, which will be empty in the case of the routes handled by Next (because Next sends and ends the response by itself).
const compression = require('compression'); const koaConnect = require('koa-connect'); server.use(koaConnect(compression()));