<commit_before># finalhandler

[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Node.js Version][node-image]][node-url]
[![Build Status][travis-image]][travis-url]
[![Test Coverage][coveralls-image]][coveralls-url]

Node.js function to invoke as the final step to respond to HTTP request.

## Installation

```sh
$ npm install finalhandler
```

## API

```js
var finalhandler = require('finalhandler')
```

### finalhandler(req, res, [options])

Returns function to be invoked as the final step for the given `req` and `res`.
This function is to be invoked as `fn(err)`. If `err` is falsy, the handler will
write out a 404 response to the `res`. If it is truthy, an error response will
be written out to the `res`.
<commit_msg>docs: add preamble to install section<commit_after># finalhandler

[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Node.js Version][node-image]][node-url]
[![Build Status][travis-image]][travis-url]
[![Test Coverage][coveralls-image]][coveralls-url]

Node.js function to invoke as the final step to respond to HTTP request.

## Installation

This is a [Node.js](https://nodejs.org/en/) module available through the
[npm registry](https://www.npmjs.com/). Installation is done using the
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):

```sh
$ npm install finalhandler
```

## API

```js
var finalhandler = require('finalhandler')
```

### finalhandler(req, res, [options])

Returns function to be invoked as the final step for the given `req` and `res`.
This function is to be invoked as `fn(err)`. If `err` is falsy, the handler will
write out a 404 response to the `res`. If it is truthy, an error response will
be written out to the `res`.

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{'dir': 'git-commits-cleaned', 'id': '2575963', 'n_tokens_mistral': 599, 'n_tokens_neox': 574, 'n_words': 203}