how to call a webService in titanium

I am new to titanium and and want to call a web service from my titanium app. The webService returns the json response. As I am aware of calling the webService using XMLRPC but very confused regarding json.

up-till now i know that we have to create the HTTPClient.

  var request = Titanium.Network.createHTTPClient();
  request.open("POST", "http://test.com/services/json");
  request.onload = function() {
  var content = JSON.parse(this.responseText);//in the content i have the response data

  };

 request.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); //did not understand this line
 request.send();

Now the problem is if my url(endpoints) have many WebServices, so where i will give the method name i.e WS name which is to be called.

From the API documentation of Titanium mobile the function open i.e. request.open accepts 3 parameters:

1. method name (http method name)

2. url of request

3. async (boolean property) by default true.

In the above code what is "POST" doing there?? and if my WS name is system.connect then where i will be mentioning that in code?

And what if the WS needs parameter, so how can we send the parameter to the webService form the above code.

I know that request.send() can be used to send parameter but how ??

Hi Ajeet, The parameter in request.send() is the POST body. You can send parameters in form key1=value1&key2=value2 or json or what you want.

I good idea is to untrust datas from net and to code:

req.onload = function(_callback) {
    var res = this.responseText;
    try{ _callback(JSON.parse(res);)
    }
catch(E) {Ti.API.log(E);}
 
}