FM / fresh

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/var/www/p4ela.kz/server/delivery/node_modules/fresh

Name	Size	Mode	Actions
HISTORY.md	1500	0644	edit dl rm
index.js	2711	0644	edit dl rm
LICENSE	1174	0644	edit dl rm
package.json	2460	0644	edit dl rm
README.md	3374	0644	edit dl rm

Edit: /var/www/p4ela.kz/server/delivery/node_modules/fresh/README.md (3374B)

# fresh

[![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]

HTTP response freshness testing

## 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):

```
$ npm install fresh
```

## API

```js
var fresh = require('fresh')
```

### fresh(reqHeaders, resHeaders)

Check freshness of the response using request and response headers.

When the response is still "fresh" in the client's cache `true` is
returned, otherwise `false` is returned to indicate that the client
cache is now stale and the full response should be sent.

When a client sends the `Cache-Control: no-cache` request header to
indicate an end-to-end reload request, this module will return `false`
to make handling these requests transparent.

## Known Issues

This module is designed to only follow the HTTP specifications, not
to work-around all kinda of client bugs (especially since this module
typically does not recieve enough information to understand what the
client actually is).

There is a known issue that in certain versions of Safari, Safari
will incorrectly make a request that allows this module to validate
freshness of the resource even when Safari does not have a
representation of the resource in the cache. The module
[jumanji](https://www.npmjs.com/package/jumanji) can be used in
an Express application to work-around this issue and also provides
links to further reading on this Safari bug.

## Example

### API usage

```js
var reqHeaders = { 'if-none-match': '"foo"' }
var resHeaders = { 'etag': '"bar"' }
fresh(reqHeaders, resHeaders)
// => false

var reqHeaders = { 'if-none-match': '"foo"' }
var resHeaders = { 'etag': '"foo"' }
fresh(reqHeaders, resHeaders)
// => true
```

### Using with Node.js http server

```js
var fresh = require('fresh')
var http = require('http')

var server = http.createServer(function (req, res) {
  // perform server logic
  // ... including adding ETag / Last-Modified response headers

if (isFresh(req, res)) {
    // client has a fresh copy of resource
    res.statusCode = 304
    res.end()
    return
  }

// send the resource
  res.statusCode = 200
  res.end('hello, world!')
})

function isFresh (req, res) {
  return fresh(req.headers, {
    'etag': res.getHeader('ETag'),
    'last-modified': res.getHeader('Last-Modified')
  })
}

server.listen(3000)
```

## License

[MIT](LICENSE)

[npm-image]: https://img.shields.io/npm/v/fresh.svg
[npm-url]: https://npmjs.org/package/fresh
[node-version-image]: https://img.shields.io/node/v/fresh.svg
[node-version-url]: https://nodejs.org/en/
[travis-image]: https://img.shields.io/travis/jshttp/fresh/master.svg
[travis-url]: https://travis-ci.org/jshttp/fresh
[coveralls-image]: https://img.shields.io/coveralls/jshttp/fresh/master.svg
[coveralls-url]: https://coveralls.io/r/jshttp/fresh?branch=master
[downloads-image]: https://img.shields.io/npm/dm/fresh.svg
[downloads-url]: https://npmjs.org/package/fresh

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