@fastify/accept-negotiator

A negotiator for accept-* headers.

Install

npm i @fastify/accept-negotiator

Usage

The module exports a function that you can use for negotiating an accept-* header such as accept-encoding. It takes 2 parameters:

negotiate(header, supportedValues)

• header (string, required) - The accept-header, e.g. accept-encoding
• supportedValues (string[], required) - The values, which are supported

const negotiate = require('@fastify/accept-negotiator').negotiate
const encoding = negotiate('gzip, deflate, br', ['br'])
console.log(encoding) // 'br*

The module also exports a class that you can use for negotiating an accept-* header, and use caching for better performance.

Negotiate(supportedValues)

• supportedValues (string[], required) - The values, which are supported
• cache ({ set: Function; get: Function; has: Function }, optional) - A Cache-Store, e.g. ES6-Map or mnemonist LRUCache

const Negotiator = require('@fastify/accept-negotiator').Negotiator
const encodingNegotiator = new Negotiator({ supportedValues: ['br'], cache: new Map() })

const encoding = encodingNegotiator.negotiate('gzip, deflate, br')
console.log(encoding) // 'br*

License

Licensed under MIT.