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101 lines
2.7 KiB
101 lines
2.7 KiB
# 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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