降低Node.js套接字连接的超时

Question

I want to verify using Node.js whether a certain port is reachable or not. Basically, what I did is write the following program:

var net = require('net');

var client = new net.Socket();

client.connect(3003, 'localhost');

client.on('error', function (err) {
  console.log(err);
  process.exit();
});

client.once('connect', function () {
  console.log('Connected!');
  process.exit();
});

So far, this pretty much works fine. There is only one thing I'm not happy with, and that is the timeout handling. Locally it works as expected, but when I try

client.connect(81, 'www.google.de');

it takes up to two minutes until I get a timeout. Why is that happening, and what can I do against it?

PS: I know that there is the setTimeout function for sockets in Node.js, but either it does not what I think it should, or I am using it wrong.

Answer 1

Add this lines for handle timeout:

client.setTimeout(1000);
client.on('timeout', function(){
  client.end();
})'

or:

client.setTimeout(1000, function(){
  client.end();
});

Docs: here