Name	Last modified	Size	Description
	Parent Directory		-
	LICENSE	1985-10-26 08:15	1.0K
	README.md	1985-10-26 08:15	1.8K	d7c1522 post receive test [كارل مبارك]
	index.js	1985-10-26 08:15	859
	package.json	2023-06-15 18:21	1.6K

# `resolve-alpn`

[![Node CI](https://github.com/szmarczak/resolve-alpn/workflows/Node%20CI/badge.svg)](https://github.com/szmarczak/resolve-alpn/actions)
[![codecov](https://codecov.io/gh/szmarczak/resolve-alpn/branch/master/graph/badge.svg)](https://codecov.io/gh/szmarczak/resolve-alpn)

## API

### resolveALPN(options, connect = tls.connect)

Returns an object with an `alpnProtocol` property. The `socket` property may be also present.

```js
const result = await resolveALPN({
	host: 'nghttp2.org',
	port: 443,
	ALPNProtocols: ['h2', 'http/1.1'],
	servername: 'nghttp2.org'
});

console.log(result); // {alpnProtocol: 'h2'}
```

**Note:** While the `servername` option is not required in this case, many other servers do. It's best practice to set it anyway.

**Note:** If the socket times out, the promise will resolve and `result.timeout` will be set to `true`.

#### options

Same as [TLS options](https://nodejs.org/api/tls.html#tls_tls_connect_options_callback).

##### options.resolveSocket

By default, the socket gets destroyed and the promise resolves.<br>
If you set this to true, it will return the socket in a `socket` property.

```js
const result = await resolveALPN({
	host: 'nghttp2.org',
	port: 443,
	ALPNProtocols: ['h2', 'http/1.1'],
	servername: 'nghttp2.org',
	resolveSocket: true
});

console.log(result); // {alpnProtocol: 'h2', socket: tls.TLSSocket}

// Remember to destroy the socket if you don't use it!
result.socket.destroy();
```

#### connect

Type: `Function<TLSSocket> | AsyncFunction<TLSSocket>`\
Default: [`tls.connect`](https://nodejs.org/dist/latest-v16.x/docs/api/tls.html#tls_tls_connect_options_callback)

**Note:** No matter which function is used (synchronous or asynchronous), it **must** accept a `callback` function as a second argument. The `callback` function gets executed when the socket has successfully connected.

## License

MIT