How to test wether Service is up or not using Node Js

I am doing the following code to test whether a service is up or not , but I am always getting error , can you please point me what I am doing wrong. The one I am trying to invoke is a dotnet webservice. I tried giving port also , But that also didn't work

var http = require('http');

     var options = {
     host: 'www.test.com/SomeService.svc'    
     };

 http.get(options, function(res) {
    console.log('got response: ' + res.statusCode);
 }).on('error', function(err) {
 console.log('got error: ' + err.message);
 });

I am getting below error.

got error: getaddrinfo ENOTFOUND