check server connection

[Marek Lewczuk]

Hello,
I have JS function which is checking connection with my server, but it 
is working in synchronous mode... How can I check server connection in 
async mode ?

Below my sync function:

var hostCheck = 
Components.classes["@mozilla.org/network/dns-service;1"].getService();
hostCheck.QueryInterface(Components.interfaces.nsIDNSService);
 try {
 var hostIP = hostCheck.resolve(SAMARAPP_DES_SERVER_HOST);
}
catch (ex) {
 location.assign("Error_ServerUnreachable.xul");
}
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