forked from lix-project/lix-website
102 lines
2.7 KiB
Markdown
102 lines
2.7 KiB
Markdown
|
# 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
|
||
|
|
|
||
|
|
<!-- 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
|