[![NPM Version][npm-image]][npm-url]

precondition

This module provides utilites for evaluating conditional requests (as defined in RFC 7232)

Installation

This is a Node.js module available through the
npm registry. Installation is done using the
npm install command:

``sh
$ npm install http-preconditions
`


Usage

`js
var precondition = require('http-preconditions')
`


$3

#### req

req nodejs request object

#### options

The precondition constructor take an options argument which should be any one
of the following

##### weak
when set to true, enable weak etag comparison. Defaults to false

##### etag

String value represents the resources etag metadata.

##### lastModified

Resource last-modified date as http-date string

$3

`js
var precondition = require('http-preconditions')

var precondition = new precondition(req, {weak: true, etag: 'W/blahblahblah'})
`


$3

`js
var precondition = require('http-preconditions')

var precondition = new precondition(req, {weak: true, etag: 'W/blahblahblah'})

if (precondition.condition) {
res.status(200)
}
`


$3

Returns true if request contains an if-range precondition header field

$3

Return true if request is a cache revalidation request

$3

Returns true` if request is a conditional request

License

MIT License

Author

Bryan Elee (rxbryn@gmail.com)

[npm-url]: https://www.npmjs.com/package/http-preconditions
[npm-image]: https://img.shields.io/badge/npm-v6.14-blue
[http-date-image]: https://img.shields.io/badge/http-preconditions-v1.0.0-success