Calling of webservice in titanium mobile application code always return response with status code 0 - rest

Question

I am new to titanium appcelerator family. Also I am not sure if somebody has posted the same problem before. I couldn't found it so posting it here.
I am developing one mobile application. And in my application I am trying to call one web service which is hosted on my local environment, but it is always returning response with status code 0 and error message "Can't reach host". So I thought that there should be some problem with my web service that I deployed on remote location. And hence I have tried to call some other web services like twitter, but it's same.. :( It is giving me an error while calling twitter web service also.
I also check for a cross domain policy issue. So I have also tried to set rule on server for web service, but it didn't work out. Following is code snippet and environment details that I am using.
Application type: Mobile
Titanium SDK: 2.1.4 GA
Device: Web Browser
Host Operating System: Windows 7
Titanium Studio: Titanium Studio, build: 2.1.2.201208301612
Files for sample web service which is I am calling is present on following locations:
http://db.tt/XoSCujux (api.php)
http://db.tt/bJG2A5XT (Rest.inc.php)
http://db.tt/Hxt6Oojx (.htaccess)
Code:
//declare the http client object
var xhr = Titanium.Network.createHTTPClient();
//this method will process the remote data
xhr.onload = function() {
//check to see if we are refreshing the data via our
//pull and release mechanism
//create a json object using the JSON.PARSE function
result = JSON.parse(this.responseText);
Ti.API.info(result);
console.log(result);
var msgTitle = "data:";
var msgText = result;
var alertBox = Ti.UI.createAlertDialog({
title: msgTitle,
message: msgText
});
alertBox.show();
};
//this method will fire if there's an error in accessing the remote data
xhr.onerror = function(e) {
//log the error to our titanium developer console
Ti.API.error(this.status + ' - ' + this.statusText);
console.log(this.status + ' - ' + this.statusText);
var msgTitle = "Error : " + this.status;
var msgText = "Error Text : " + this.statusText;
var alertBox = Ti.UI.createAlertDialog({
title: msgTitle,
message: msgText
});
alertBox.show();
Ti.API.debug("STATUS: " + this.status);
Ti.API.debug("TEXT: " + this.responseText);
Ti.API.debug("ERROR: " + e.error);
alert('There was an error retrieving the remote data. Try again.' + e.error);
};
//open up the recipes xml feed
xhr.open("POST", "http://127.0.0.1/rest_example/api.php?rquest=locations");
//finally, execute the call to the remote feed
xhr.send();
Any help would be really appreciated.