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`resolve-alpn`\n\n[](https://github.com/szmarczak/resolve-alpn/actions)\n[](https://codecov.io/gh/szmarczak/resolve-alpn)\n\n## API\n\n### resolveALPN(options, connect = tls.connect)\n\nReturns an object with an `alpnProtocol` property. The `socket` property may be also present.\n\n```js\nconst result = await resolveALPN({\n\thost: 'nghttp2.org',\n\tport: 443,\n\tALPNProtocols: ['h2', 'http/1.1'],\n\tservername: 'nghttp2.org'\n});\n\nconsole.log(result); // {alpnProtocol: 'h2'}\n```\n\n**Note:** While the `servername` option is not required in this case, many other servers do. It's best practice to set it anyway.\n\n**Note:** If the socket times out, the promise will resolve and `result.timeout` will be set to `true`.\n\n#### options\n\nSame as [TLS options](https://nodejs.org/api/tls.html#tls_tls_connect_options_callback).\n\n##### options.resolveSocket\n\nBy default, the socket gets destroyed and the promise resolves.
\nIf you set this to true, it will return the socket in a `socket` property.\n\n```js\nconst result = await resolveALPN({\n\thost: 'nghttp2.org',\n\tport: 443,\n\tALPNProtocols: ['h2', 'http/1.1'],\n\tservername: 'nghttp2.org',\n\tresolveSocket: true\n});\n\nconsole.log(result); // {alpnProtocol: 'h2', socket: tls.TLSSocket}\n\n// Remember to destroy the socket if you don't use it!\nresult.socket.destroy();\n```\n\n#### connect\n\nType: `Function | AsyncFunction`\\\nDefault: [`tls.connect`](https://nodejs.org/dist/latest-v16.x/docs/api/tls.html#tls_tls_connect_options_callback)\n\n**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.\n\n## License\n\nMIT\n","_attachments":{},"homepage":"https://github.com/szmarczak/resolve-alpn#readme","bugs":{"url":"https://github.com/szmarczak/resolve-alpn/issues"},"license":"MIT"}