FM / vary

/var/www/verywell.gr/server/delivery/node_modules/vary/

/var/www/verywell.gr/server/delivery/node_modules/vary

Name	Size	Mode	Actions
HISTORY.md	792	0644	edit dl rm
index.js	2930	0644	edit dl rm
LICENSE	1094	0644	edit dl rm
package.json	2170	0644	edit dl rm
README.md	2716	0644	edit dl rm

Edit: /var/www/verywell.gr/server/delivery/node_modules/vary/README.md (2716B)

# vary

[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Node.js Version][node-version-image]][node-version-url]
[![Build Status][travis-image]][travis-url]
[![Test Coverage][coveralls-image]][coveralls-url]

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

```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.

```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.

```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

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