如何在Go中终止网络拨号？

I have a client who try to connect to a server.

I need to be able to terminate the client and abort this Dial attempt. Is this possible ? How could I do that ?

The timeout is apparently longer than 30s since the test blocks until the 30s elapse without a failure of the Dial call.

Can we specify a timeout ourself ?

The net.Dialer has Timeout and Deadline fields, and also can use a context with DialContext which allows for timeout and cancelation.

You can refer to DialTimeout to see how to setup the basic Dialer:

func DialTimeout(network, address string, timeout time.Duration) (Conn, error) {
    d := Dialer{Timeout: timeout}
    return d.Dial(network, address)
}

And an example with a context.Context:

var d Dialer
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()

return d.DialContext(ctx, network, address)