Send is Connect's static()
extracted for generalized use, a streaming static file
server supporting partial responses (Ranges), conditional-GET negotiation, high test coverage, and granular events which may be leveraged to take appropriate actions in your application or framework.
$ npm install send
var send = require('send')
Create a new SendStream
for the given path to send to a res
. The req
is
the Node.js HTTP request and the path
is a urlencoded path to send (urlencoded,
not the actual file-system path).
Set how "dotfiles" are treated when encountered. A dotfile is a file
or directory that begins with a dot ("."). Note this check is done on
the path itself without checking if the path actually exists on the
disk. If root
is specified, only the dotfiles above the root are
checked (i.e. the root itself can be within a dotfile when when set
to "deny").
The default value is 'ignore'
.
'allow'
No special treatment for dotfiles.'deny'
Send a 403 for any request for a dotfile.'ignore'
Pretend like the dotfile does not exist and 404.
Enable or disable etag generation, defaults to true.
If a given file doesn't exist, try appending one of the given extensions,
in the given order. By default, this is disabled (set to false
). An
example value that will serve extension-less HTML files: ['html', 'htm']
.
This is skipped if the requested file already has an extension.
By default send supports "index.html" files, to disable this
set false
or to supply a new index pass a string or an array
in preferred order.
Enable or disable Last-Modified
header, defaults to true. Uses the file
system's last modified value.
Provide a max-age in milliseconds for http caching, defaults to 0. This can also be a string accepted by the ms module.
Serve files relative to path
.
The SendStream
is an event emitter and will emit the following events:
error
an error occurred(err)
directory
a directory was requestedfile
a file was requested(path, stat)
headers
the headers are about to be set on a file(res, path, stat)
stream
file streaming has started(stream)
end
streaming has completed
The pipe
method is used to pipe the response into the Node.js HTTP response
object, typically send(req, path, options).pipe(res)
.
By default when no error
listeners are present an automatic response will be made, otherwise you have full control over the response, aka you may show a 5xx page etc.
It does not perform internal caching, you should use a reverse proxy cache such as Varnish for this, or those fancy things called CDNs. If your application is small enough that it would benefit from single-node memory caching, it's small enough that it does not need caching at all ;).
To enable debug()
instrumentation output export DEBUG:
$ DEBUG=send node app
$ npm install
$ npm test
Small:
var http = require('http');
var send = require('send');
var app = http.createServer(function(req, res){
send(req, req.url).pipe(res);
}).listen(3000);
Serving from a root directory with custom error-handling:
var http = require('http');
var send = require('send');
var url = require('url');
var app = http.createServer(function(req, res){
// your custom error-handling logic:
function error(err) {
res.statusCode = err.status || 500;
res.end(err.message);
}
// your custom headers
function headers(res, path, stat) {
// serve all files for download
res.setHeader('Content-Disposition', 'attachment');
}
// your custom directory handling logic:
function redirect() {
res.statusCode = 301;
res.setHeader('Location', req.url + '/');
res.end('Redirecting to ' + req.url + '/');
}
// transfer arbitrary files from within
// /www/example.com/public/*
send(req, url.parse(req.url).pathname, {root: '/www/example.com/public'})
.on('error', error)
.on('directory', redirect)
.on('headers', headers)
.pipe(res);
}).listen(3000);