Create example using custom charset (#3697)

https://github.com/zeit/next.js/issues/3401

examples/custom-charset/package.json

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+{
+  "name": "custom-server",
+  "version": "1.0.0",
+  "scripts": {
+    "dev": "node server.js",
+    "build": "next build",
+    "start": "NODE_ENV=production node server.js"
+  },
+  "dependencies": {
+    "next": "latest",
+    "react": "^16.0.0",
+    "react-dom": "^16.0.0"
+  }
+}

examples/custom-charset/pages/README.md

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+[![Deploy to now](https://deploy.now.sh/static/button.svg)](https://deploy.now.sh/?repo=https://github.com/zeit/next.js/tree/master/examples/custom-server)
+
+# Custom server example
+
+## How to use
+
+### Download manually
+
+Download the example [or clone the repo](https://github.com/zeit/next.js):
+
+```bash
+curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/custom-charset
+cd custom-charset
+```
+
+Install it and run:
+
+```bash
+npm install
+npm run dev
+```
+
+Deploy it to the cloud with [now](https://zeit.co/now) ([download](https://zeit.co/download))
+
+```bash
+now
+```
+
+## The idea behind the example
+
+The HTTP/1.1 specification says - if charset is not set in the http header then the browser defaults use ISO-8859-1. 
+For languages like Polish, Albanian, Hungarian, Czech, Slovak, Slovene, there will be broken characters encoding from SSR.
+
+You can overwrite Content-Type in getInitialProps. But if you want to handle it as a server side concern, you can use this as an simple example.

examples/custom-charset/pages/index.js

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+import React from 'react'
+
+export default () => <div>áéíóöúü</div>

examples/custom-charset/server.js

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+const { createServer } = require('http')
+const { parse } = require('url')
+const next = require('next')
+
+const port = parseInt(process.env.PORT, 10) || 3000
+const dev = process.env.NODE_ENV !== 'production'
+const app = next({ dev })
+const handle = app.getRequestHandler()
+
+app.prepare()
+.then(() => {
+  createServer((req, res) => {
+    const parsedUrl = parse(req.url, true)
+    res.setHeader('Content-Type', 'text/html; charset=iso-8859-2')
+    handle(req, res, parsedUrl)
+  })
+  .listen(port, (err) => {
+    if (err) throw err
+    console.log(`> Ready on http://localhost:${port}`)
+  })
+})