# [**koa-send**](https://github.com/koajs/send)
> Static file serving middleware.
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[![Build status][travis-image]][travis-url]
[![Test coverage][coveralls-image]][coveralls-url]
[![Dependency Status][david-image]][david-url]
[![License][license-image]][license-url]
[![Downloads][downloads-image]][downloads-url]
## Installation
```js
$ npm install koa-send
```
## Options
- `maxage` Browser cache max-age in milliseconds. (defaults to `0`).
- `immutable` Tell the browser the resource is immutable and can be cached indefinitely. (defaults to `false`).
- `hidden` Allow transfer of hidden files. (defaults to `false`).
- [`root`](#root-path) Root directory to restrict file access.
- `index` Name of the index file to serve automatically when visiting the root location. (defaults to none).
- `gzip` Try to serve the gzipped version of a file automatically when `gzip` is supported by a client and if the requested file with `.gz` extension exists. (defaults to `true`).
- `brotli` Try to serve the brotli version of a file automatically when `brotli` is supported by a client and if the requested file with `.br` extension exists. (defaults to `true`).
- `format` If not `false` (defaults to `true`), format the path to serve static file servers and not require a trailing slash for directories, so that you can do both `/directory` and `/directory/`.
- [`setHeaders`](#setheaders) Function to set custom headers on response.
- `extensions` Try to match extensions from passed array to search for file when no extension is sufficed in URL. First found is served. (defaults to `false`)
### Root path
Note that `root` is required, defaults to `''` and will be resolved,
removing the leading `/` to make the path relative and this
path must not contain "..", protecting developers from
concatenating user input. If you plan on serving files based on
user input supply a `root` directory from which to serve from.
For example to serve files from `./public`:
```js
app.use(async (ctx) => {
await send(ctx, ctx.path, { root: __dirname + '/public' });
})
```
To serve developer specified files:
```js
app.use(async (ctx) => {
await send(ctx, 'path/to/my.js');
})
```
### setHeaders
The function is called as `fn(res, path, stats)`, where the arguments are:
* `res`: the response object.
* `path`: the resolved file path that is being sent.
* `stats`: the stats object of the file that is being sent.
You should only use the `setHeaders` option when you wish to edit the `Cache-Control` or `Last-Modified` headers, because doing it before is useless (it's overwritten by `send`), and doing it after is too late because the headers are already sent.
If you want to edit any other header, simply set them before calling `send`.
## Example
```js
const send = require('koa-send');
const Koa = require('koa');
const app = new Koa();
// $ GET /package.json
// $ GET /
app.use(async (ctx) => {
if ('/' == ctx.path) return ctx.body = 'Try GET /package.json';
await send(ctx, ctx.path);
})
app.listen(3000);
console.log('listening on port 3000');
```
## License
[MIT](/LICENSE)
[npm-image]: https://img.shields.io/npm/v/koa-send.svg?style=flat-square
[npm-url]: https://npmjs.org/package/koa-send
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[github-url]: https://github.com/koajs/send/tags
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[travis-url]: https://travis-ci.org/koajs/send
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[coveralls-url]: https://coveralls.io/r/koajs/send?branch=master
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[david-url]: https://david-dm.org/koajs/send
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[license-url]: LICENSE
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[downloads-url]: https://npmjs.org/package/koa-send
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