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141 lines
4.0 KiB
Markdown
141 lines
4.0 KiB
Markdown
# accepts
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[![NPM Version][npm-version-image]][npm-url]
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[![NPM Downloads][npm-downloads-image]][npm-url]
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[![Node.js Version][node-version-image]][node-version-url]
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[![Build Status][github-actions-ci-image]][github-actions-ci-url]
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[![Test Coverage][coveralls-image]][coveralls-url]
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Higher level content negotiation based on [negotiator](https://www.npmjs.com/package/negotiator).
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Extracted from [koa](https://www.npmjs.com/package/koa) for general use.
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In addition to negotiator, it allows:
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- Allows types as an array or arguments list, ie `(['text/html', 'application/json'])`
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as well as `('text/html', 'application/json')`.
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- Allows type shorthands such as `json`.
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- Returns `false` when no types match
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- Treats non-existent headers as `*`
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## Installation
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This is a [Node.js](https://nodejs.org/en/) module available through the
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[npm registry](https://www.npmjs.com/). Installation is done using the
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[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
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```sh
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$ npm install accepts
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```
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## API
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```js
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var accepts = require('accepts')
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```
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### accepts(req)
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Create a new `Accepts` object for the given `req`.
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#### .charset(charsets)
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Return the first accepted charset. If nothing in `charsets` is accepted,
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then `false` is returned.
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#### .charsets()
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Return the charsets that the request accepts, in the order of the client's
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preference (most preferred first).
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#### .encoding(encodings)
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Return the first accepted encoding. If nothing in `encodings` is accepted,
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then `false` is returned.
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#### .encodings()
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Return the encodings that the request accepts, in the order of the client's
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preference (most preferred first).
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#### .language(languages)
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Return the first accepted language. If nothing in `languages` is accepted,
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then `false` is returned.
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#### .languages()
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Return the languages that the request accepts, in the order of the client's
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preference (most preferred first).
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#### .type(types)
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Return the first accepted type (and it is returned as the same text as what
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appears in the `types` array). If nothing in `types` is accepted, then `false`
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is returned.
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The `types` array can contain full MIME types or file extensions. Any value
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that is not a full MIME types is passed to `require('mime-types').lookup`.
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#### .types()
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Return the types that the request accepts, in the order of the client's
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preference (most preferred first).
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## Examples
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### Simple type negotiation
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This simple example shows how to use `accepts` to return a different typed
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respond body based on what the client wants to accept. The server lists it's
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preferences in order and will get back the best match between the client and
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server.
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```js
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var accepts = require('accepts')
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var http = require('http')
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function app (req, res) {
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var accept = accepts(req)
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// the order of this list is significant; should be server preferred order
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switch (accept.type(['json', 'html'])) {
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case 'json':
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res.setHeader('Content-Type', 'application/json')
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res.write('{"hello":"world!"}')
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break
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case 'html':
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res.setHeader('Content-Type', 'text/html')
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res.write('<b>hello, world!</b>')
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break
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default:
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// the fallback is text/plain, so no need to specify it above
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res.setHeader('Content-Type', 'text/plain')
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res.write('hello, world!')
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break
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}
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res.end()
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}
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http.createServer(app).listen(3000)
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```
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You can test this out with the cURL program:
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```sh
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curl -I -H'Accept: text/html' http://localhost:3000/
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```
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## License
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[MIT](LICENSE)
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[coveralls-image]: https://badgen.net/coveralls/c/github/jshttp/accepts/master
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[coveralls-url]: https://coveralls.io/r/jshttp/accepts?branch=master
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[github-actions-ci-image]: https://badgen.net/github/checks/jshttp/accepts/master?label=ci
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[github-actions-ci-url]: https://github.com/jshttp/accepts/actions/workflows/ci.yml
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[node-version-image]: https://badgen.net/npm/node/accepts
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[node-version-url]: https://nodejs.org/en/download
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[npm-downloads-image]: https://badgen.net/npm/dm/accepts
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[npm-url]: https://npmjs.org/package/accepts
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[npm-version-image]: https://badgen.net/npm/v/accepts
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