vary
Manipulate the HTTP Vary header
Installation
$ npm install vary
API
var vary = require('vary')
vary(res, field)
Adds the given header field
to the Vary
response header of res
.
This can be a string of a single field, a string of a valid Vary
header, or an array of multiple fields.
This will append the header if not already listed, otherwise leaves
it listed in the current location.
vary(res, 'Origin')
Adds the given header field
to the Vary
response header string header
.
This can be a string of a single field, a string of a valid Vary
header,
or an array of multiple fields.
This will append the header if not already listed, otherwise leaves
it listed in the current location. The new header string is returned.
vary.append('Accept, User-Agent', 'Origin')
Examples
var http = require('http')
var vary = require('vary')
http.createServer(function onRequest(req, res) {
vary(res, 'User-Agent')
var ua = req.headers['user-agent'] || ''
var isMobile = /mobi|android|touch|mini/i.test(ua)
res.setHeader('Content-Type', 'text/html')
res.end('You are (probably) ' + (isMobile ? '' : 'not ') + 'a mobile user')
})
Testing
$ npm test
License
MIT