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# vary
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[![NPM Version][npm-image]][npm-url]
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[![NPM Downloads][downloads-image]][downloads-url]
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[![Node.js Version][node-version-image]][node-version-url]
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[![Build Status][travis-image]][travis-url]
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[![Test Coverage][coveralls-image]][coveralls-url]
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Manipulate the HTTP Vary header
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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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```sh
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$ npm install vary
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```
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## API
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<!-- eslint-disable no-unused-vars -->
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```js
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var vary = require('vary')
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```
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### vary(res, field)
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Adds the given header `field` to the `Vary` response header of `res`.
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This can be a string of a single field, a string of a valid `Vary`
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header, or an array of multiple fields.
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This will append the header if not already listed, otherwise leaves
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it listed in the current location.
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<!-- eslint-disable no-undef -->
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```js
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// Append "Origin" to the Vary header of the response
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vary(res, 'Origin')
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```
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### vary.append(header, field)
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Adds the given header `field` to the `Vary` response header string `header`.
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This can be a string of a single field, a string of a valid `Vary` header,
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or an array of multiple fields.
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This will append the header if not already listed, otherwise leaves
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it listed in the current location. The new header string is returned.
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<!-- eslint-disable no-undef -->
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```js
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// Get header string appending "Origin" to "Accept, User-Agent"
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vary.append('Accept, User-Agent', 'Origin')
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```
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## Examples
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### Updating the Vary header when content is based on it
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```js
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var http = require('http')
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var vary = require('vary')
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http.createServer(function onRequest (req, res) {
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// about to user-agent sniff
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vary(res, 'User-Agent')
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var ua = req.headers['user-agent'] || ''
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var isMobile = /mobi|android|touch|mini/i.test(ua)
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// serve site, depending on isMobile
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res.setHeader('Content-Type', 'text/html')
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res.end('You are (probably) ' + (isMobile ? '' : 'not ') + 'a mobile user')
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})
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```
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## Testing
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```sh
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$ npm test
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```
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## License
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[MIT](LICENSE)
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[npm-image]: https://img.shields.io/npm/v/vary.svg
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[npm-url]: https://npmjs.org/package/vary
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[node-version-image]: https://img.shields.io/node/v/vary.svg
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[node-version-url]: https://nodejs.org/en/download
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[travis-image]: https://img.shields.io/travis/jshttp/vary/master.svg
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[travis-url]: https://travis-ci.org/jshttp/vary
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[coveralls-image]: https://img.shields.io/coveralls/jshttp/vary/master.svg
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[coveralls-url]: https://coveralls.io/r/jshttp/vary
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[downloads-image]: https://img.shields.io/npm/dm/vary.svg
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[downloads-url]: https://npmjs.org/package/vary
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