Strophe Message Sent Acknowledgment Issue

I have implemented OPENFIRE with XMPP + BOSH on my Web based client interface. When i am sending the message ,i check whether connection is live or not.If it is not live i create new connection and then send.

Sometimes it happens that client send a message and it is not get delivered to server(not opposite client). So for that i need a strong thing that should inform client that this message didn't reach to server,please send again.

try { // sleep(2000);
    Gab.connection.send(message); >
    **var request = $msg({
        to: jid,
        "type": "get",
        id: mid
    }).c('get', {
        'xmlns': Strophe.NS.DISCO_INFO,
        'id': mid
    });**
    console.log(request); >

} catch (err) {
    alert("Internet Disconnected ! Click ok to Reconnect SEND");
    window.top.location.reload(1);
}

On above code i call message send().After that i call function as mentioned in "XMPP:xep-0184" doc. but no response i received.

Thank you in advance.