318 lines
8.8 KiB
Markdown
318 lines
8.8 KiB
Markdown
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# send
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[![NPM Version][npm-version-image]][npm-url]
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[![NPM Downloads][npm-downloads-image]][npm-url]
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[![CI][github-actions-ci-image]][github-actions-ci-url]
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[![Test Coverage][coveralls-image]][coveralls-url]
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Send is a library for streaming files from the file system as a http response
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supporting partial responses (Ranges), conditional-GET negotiation (If-Match,
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If-Unmodified-Since, If-None-Match, If-Modified-Since), high test coverage,
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and granular events which may be leveraged to take appropriate actions in your
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application or framework.
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Looking to serve up entire folders mapped to URLs? Try [serve-static](https://www.npmjs.org/package/serve-static).
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## Installation
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This is a [Node.js](https://nodejs.org/en/) module available through the
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[npm registry](https://www.npmjs.com/). Installation is done using the
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[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
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```bash
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$ npm install send
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```
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## API
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```js
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var send = require('send')
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```
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### send(req, path, [options])
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Create a new `SendStream` for the given path to send to a `res`. The `req` is
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the Node.js HTTP request and the `path` is a urlencoded path to send (urlencoded,
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not the actual file-system path).
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#### Options
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##### acceptRanges
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Enable or disable accepting ranged requests, defaults to true.
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Disabling this will not send `Accept-Ranges` and ignore the contents
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of the `Range` request header.
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##### cacheControl
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Enable or disable setting `Cache-Control` response header, defaults to
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true. Disabling this will ignore the `immutable` and `maxAge` options.
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##### dotfiles
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Set how "dotfiles" are treated when encountered. A dotfile is a file
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or directory that begins with a dot ("."). Note this check is done on
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the path itself without checking if the path actually exists on the
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disk. If `root` is specified, only the dotfiles above the root are
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checked (i.e. the root itself can be within a dotfile when set
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to "deny").
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- `'allow'` No special treatment for dotfiles.
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- `'deny'` Send a 403 for any request for a dotfile.
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- `'ignore'` Pretend like the dotfile does not exist and 404.
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The default value is _similar_ to `'ignore'`, with the exception that
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this default will not ignore the files within a directory that begins
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with a dot, for backward-compatibility.
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##### end
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Byte offset at which the stream ends, defaults to the length of the file
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minus 1. The end is inclusive in the stream, meaning `end: 3` will include
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the 4th byte in the stream.
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##### etag
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Enable or disable etag generation, defaults to true.
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##### extensions
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If a given file doesn't exist, try appending one of the given extensions,
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in the given order. By default, this is disabled (set to `false`). An
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example value that will serve extension-less HTML files: `['html', 'htm']`.
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This is skipped if the requested file already has an extension.
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##### immutable
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Enable or disable the `immutable` directive in the `Cache-Control` response
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header, defaults to `false`. If set to `true`, the `maxAge` option should
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also be specified to enable caching. The `immutable` directive will prevent
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supported clients from making conditional requests during the life of the
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`maxAge` option to check if the file has changed.
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##### index
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By default send supports "index.html" files, to disable this
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set `false` or to supply a new index pass a string or an array
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in preferred order.
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##### lastModified
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Enable or disable `Last-Modified` header, defaults to true. Uses the file
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system's last modified value.
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##### maxAge
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Provide a max-age in milliseconds for http caching, defaults to 0.
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This can also be a string accepted by the
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[ms](https://www.npmjs.org/package/ms#readme) module.
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##### root
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Serve files relative to `path`.
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##### start
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Byte offset at which the stream starts, defaults to 0. The start is inclusive,
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meaning `start: 2` will include the 3rd byte in the stream.
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#### Events
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The `SendStream` is an event emitter and will emit the following events:
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- `error` an error occurred `(err)`
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- `directory` a directory was requested `(res, path)`
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- `file` a file was requested `(path, stat)`
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- `headers` the headers are about to be set on a file `(res, path, stat)`
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- `stream` file streaming has started `(stream)`
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- `end` streaming has completed
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#### .pipe
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The `pipe` method is used to pipe the response into the Node.js HTTP response
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object, typically `send(req, path, options).pipe(res)`.
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## Error-handling
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By default when no `error` listeners are present an automatic response will be
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made, otherwise you have full control over the response, aka you may show a 5xx
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page etc.
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## Caching
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It does _not_ perform internal caching, you should use a reverse proxy cache
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such as Varnish for this, or those fancy things called CDNs. If your
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application is small enough that it would benefit from single-node memory
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caching, it's small enough that it does not need caching at all ;).
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## Debugging
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To enable `debug()` instrumentation output export __DEBUG__:
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```
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$ DEBUG=send node app
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```
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## Running tests
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```
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$ npm install
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$ npm test
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```
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## Examples
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### Serve a specific file
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This simple example will send a specific file to all requests.
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```js
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var http = require('http')
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var send = require('send')
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var server = http.createServer(function onRequest (req, res) {
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send(req, '/path/to/index.html')
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.pipe(res)
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})
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server.listen(3000)
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```
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### Serve all files from a directory
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This simple example will just serve up all the files in a
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given directory as the top-level. For example, a request
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`GET /foo.txt` will send back `/www/public/foo.txt`.
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```js
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var http = require('http')
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var parseUrl = require('parseurl')
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var send = require('send')
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var server = http.createServer(function onRequest (req, res) {
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send(req, parseUrl(req).pathname, { root: '/www/public' })
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.pipe(res)
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})
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server.listen(3000)
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```
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### Custom file types
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```js
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var extname = require('path').extname
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var http = require('http')
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var parseUrl = require('parseurl')
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var send = require('send')
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var server = http.createServer(function onRequest (req, res) {
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send(req, parseUrl(req).pathname, { root: '/www/public' })
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.on('headers', function (res, path) {
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switch (extname(path)) {
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case '.x-mt':
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case '.x-mtt':
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// custom type for these extensions
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res.setHeader('Content-Type', 'application/x-my-type')
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break
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}
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})
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.pipe(res)
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})
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server.listen(3000)
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```
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### Custom directory index view
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This is an example of serving up a structure of directories with a
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custom function to render a listing of a directory.
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```js
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var http = require('http')
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var fs = require('fs')
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var parseUrl = require('parseurl')
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var send = require('send')
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// Transfer arbitrary files from within /www/example.com/public/*
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// with a custom handler for directory listing
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var server = http.createServer(function onRequest (req, res) {
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send(req, parseUrl(req).pathname, { index: false, root: '/www/public' })
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.once('directory', directory)
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.pipe(res)
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})
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server.listen(3000)
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// Custom directory handler
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function directory (res, path) {
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var stream = this
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// redirect to trailing slash for consistent url
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if (!stream.hasTrailingSlash()) {
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return stream.redirect(path)
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}
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// get directory list
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fs.readdir(path, function onReaddir (err, list) {
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if (err) return stream.error(err)
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// render an index for the directory
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res.setHeader('Content-Type', 'text/plain; charset=UTF-8')
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res.end(list.join('\n') + '\n')
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})
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}
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```
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### Serving from a root directory with custom error-handling
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```js
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var http = require('http')
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var parseUrl = require('parseurl')
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var send = require('send')
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var server = http.createServer(function onRequest (req, res) {
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// your custom error-handling logic:
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function error (err) {
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res.statusCode = err.status || 500
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res.end(err.message)
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}
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// your custom headers
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function headers (res, path, stat) {
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// serve all files for download
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res.setHeader('Content-Disposition', 'attachment')
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}
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// your custom directory handling logic:
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function redirect () {
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res.statusCode = 301
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res.setHeader('Location', req.url + '/')
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res.end('Redirecting to ' + req.url + '/')
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}
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// transfer arbitrary files from within
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// /www/example.com/public/*
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send(req, parseUrl(req).pathname, { root: '/www/public' })
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.on('error', error)
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.on('directory', redirect)
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.on('headers', headers)
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.pipe(res)
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})
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server.listen(3000)
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```
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## License
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[MIT](LICENSE)
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[coveralls-image]: https://badgen.net/coveralls/c/github/pillarjs/send/master
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[coveralls-url]: https://coveralls.io/r/pillarjs/send?branch=master
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[github-actions-ci-image]: https://badgen.net/github/checks/pillarjs/send/master?label=linux
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[github-actions-ci-url]: https://github.com/pillarjs/send/actions/workflows/ci.yml
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[node-image]: https://badgen.net/npm/node/send
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[node-url]: https://nodejs.org/en/download/
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[npm-downloads-image]: https://badgen.net/npm/dm/send
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[npm-url]: https://npmjs.org/package/send
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[npm-version-image]: https://badgen.net/npm/v/send
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