Higher level content negotiation based on negotiator. Extracted from koa for general use.
In addition to negotiator, it allows:
(['text/html', 'application/json'])
as well as ('text/html', 'application/json')
.json
.false
when no types match*
This is a Node.js module available through the
npm registry. Installation is done using the
npm install
command:
$ npm install accepts
var accepts = require('accepts')
Create a new Accepts
object for the given req
.
Return the first accepted charset. If nothing in charsets
is accepted,
then false
is returned.
Return the charsets that the request accepts, in the order of the client's preference (most preferred first).
Return the first accepted encoding. If nothing in encodings
is accepted,
then false
is returned.
Return the encodings that the request accepts, in the order of the client's preference (most preferred first).
Return the first accepted language. If nothing in languages
is accepted,
then false
is returned.
Return the languages that the request accepts, in the order of the client's preference (most preferred first).
Return the first accepted type (and it is returned as the same text as what
appears in the types
array). If nothing in types
is accepted, then false
is returned.
The types
array can contain full MIME types or file extensions. Any value
that is not a full MIME type is passed to require('mime-types').lookup
.
Return the types that the request accepts, in the order of the client's preference (most preferred first).
This simple example shows how to use accepts
to return a different typed
respond body based on what the client wants to accept. The server lists it's
preferences in order and will get back the best match between the client and
server.
var accepts = require('accepts')
var http = require('http')
function app (req, res) {
var accept = accepts(req)
// the order of this list is significant; should be server preferred order
switch (accept.type(['json', 'html'])) {
case 'json':
res.setHeader('Content-Type', 'application/json')
res.write('{"hello":"world!"}')
break
case 'html':
res.setHeader('Content-Type', 'text/html')
res.write('<b>hello, world!</b>')
break
default:
// the fallback is text/plain, so no need to specify it above
res.setHeader('Content-Type', 'text/plain')
res.write('hello, world!')
break
}
res.end()
}
http.createServer(app).listen(3000)
You can test this out with the cURL program:
curl -I -H'Accept: text/html' http://localhost:3000/