# vary
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[![Node.js Version][node-version-image]][node-version-url]
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Manipulate the HTTP Vary header
## Installation
This is a [Node.js](https://nodejs.org/en/) module available through the
[npm registry](https://www.npmjs.com/). Installation is done using the
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
```sh
$ npm install vary
```
## API
<!-- eslint-disable no-unused-vars -->
```js
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.
<!-- eslint-disable no-undef -->
```js
// Append "Origin" to the Vary header of the response
vary(res, 'Origin')
```
### vary.append(header, field)
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.
<!-- eslint-disable no-undef -->
```js
// Get header string appending "Origin" to "Accept, User-Agent"
vary.append('Accept, User-Agent', 'Origin')
```
## Examples
### Updating the Vary header when content is based on it
```js
var http = require('http')
var vary = require('vary')
http.createServer(function onRequest (req, res) {
// about to user-agent sniff
vary(res, 'User-Agent')
var ua = req.headers['user-agent'] || ''
var isMobile = /mobi|android|touch|mini/i.test(ua)
// serve site, depending on isMobile
res.setHeader('Content-Type', 'text/html')
res.end('You are (probably) ' + (isMobile ? '' : 'not ') + 'a mobile user')
})
```
## Testing
```sh
$ npm test
```
## License
[MIT](LICENSE)
[npm-image]: https://img.shields.io/npm/v/vary.svg
[npm-url]: https://npmjs.org/package/vary
[node-version-image]: https://img.shields.io/node/v/vary.svg
[node-version-url]: https://nodejs.org/en/download
[travis-image]: https://img.shields.io/travis/jshttp/vary/master.svg
[travis-url]: https://travis-ci.org/jshttp/vary
[coveralls-image]: https://img.shields.io/coveralls/jshttp/vary/master.svg
[coveralls-url]: https://coveralls.io/r/jshttp/vary
[downloads-image]: https://img.shields.io/npm/dm/vary.svg
[downloads-url]: https://npmjs.org/package/vary