61 lines
1.8 KiB
Markdown
61 lines
1.8 KiB
Markdown
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# `resolve-alpn`
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[](https://github.com/szmarczak/resolve-alpn/actions)
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[](https://codecov.io/gh/szmarczak/resolve-alpn)
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## API
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### resolveALPN(options, connect = tls.connect)
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Returns an object with an `alpnProtocol` property. The `socket` property may be also present.
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```js
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const result = await resolveALPN({
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host: 'nghttp2.org',
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port: 443,
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ALPNProtocols: ['h2', 'http/1.1'],
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servername: 'nghttp2.org'
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});
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console.log(result); // {alpnProtocol: 'h2'}
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```
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**Note:** While the `servername` option is not required in this case, many other servers do. It's best practice to set it anyway.
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**Note:** If the socket times out, the promise will resolve and `result.timeout` will be set to `true`.
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#### options
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Same as [TLS options](https://nodejs.org/api/tls.html#tls_tls_connect_options_callback).
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##### options.resolveSocket
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By default, the socket gets destroyed and the promise resolves.<br>
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If you set this to true, it will return the socket in a `socket` property.
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```js
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const result = await resolveALPN({
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host: 'nghttp2.org',
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port: 443,
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ALPNProtocols: ['h2', 'http/1.1'],
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servername: 'nghttp2.org',
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resolveSocket: true
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});
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console.log(result); // {alpnProtocol: 'h2', socket: tls.TLSSocket}
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// Remember to destroy the socket if you don't use it!
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result.socket.destroy();
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```
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#### connect
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Type: `Function<TLSSocket> | AsyncFunction<TLSSocket>`\
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Default: [`tls.connect`](https://nodejs.org/dist/latest-v16.x/docs/api/tls.html#tls_tls_connect_options_callback)
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**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.
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## License
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MIT
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