### Install finalhandler

Source: https://github.com/pillarjs/finalhandler/blob/master/README.md

Install the finalhandler module using npm.

```sh
$ npm install finalhandler
```

--------------------------------

### Always return 404

Source: https://github.com/pillarjs/finalhandler/blob/master/README.md

Example demonstrating how to use finalhandler to always return a 404 response when no other logic handles the request.

```javascript
const finalhandler = require('finalhandler')
const http = require('http')

const server = http.createServer((req, res) => {
  const done = finalhandler(req, res)
  done()
})

server.listen(3000)
```

--------------------------------

### Perform simple action

Source: https://github.com/pillarjs/finalhandler/blob/master/README.md

Example showing how to use finalhandler with asynchronous file reading to serve an HTML file. If an error occurs during file reading, finalhandler will process the error.

```javascript
const finalhandler = require('finalhandler')
const fs = require('fs')
const http = require('http')

const server = http.createServer((req, res) => {
  const done = finalhandler(req, res)

  fs.readFile('index.html', (err, buf) => {
    if (err) return done(err)
    res.setHeader('Content-Type', 'text/html')
    res.end(buf)
  })
})

server.listen(3000)
```

--------------------------------

### Use with middleware-style functions

Source: https://github.com/pillarjs/finalhandler/blob/master/README.md

Example integrating finalhandler with middleware-style functions like 'serve-static'. The 'serve' middleware is called, and if it doesn't handle the request, finalhandler takes over.

```javascript
const finalhandler = require('finalhandler')
const http = require('http')
const serveStatic = require('serve-static')

const serve = serveStatic('public')

const server = http.createServer((req, res) => {
  const done = finalhandler(req, res)
  serve(req, res, done)
})

server.listen(3000)
```

--------------------------------

### Keep log of all errors

Source: https://github.com/pillarjs/finalhandler/blob/master/README.md

Example demonstrating how to provide a custom error logging function to finalhandler using the 'onerror' option. This function will be called with the error object when an error occurs.

```javascript
const finalhandler = require('finalhandler')
const fs = require('fs')
const http = require('http')

const server = http.createServer((req, res) => {
  const done = finalhandler(req, res, { onerror: logerror })

  fs.readFile('index.html', (err, buf) => {
    if (err) return done(err)
    res.setHeader('Content-Type', 'text/html')
    res.end(buf)
  })
})

server.listen(3000)

function logerror (err) {
  console.error(err.stack || err.toString())
}
```

--------------------------------

### Import finalhandler

Source: https://github.com/pillarjs/finalhandler/blob/master/README.md

Import the finalhandler module in your Node.js application.

```javascript
const finalhandler = require('finalhandler')
```

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