Consuming SOAP web service in SENCHA TOUCH? - sencha-touch

Question

I have found this post that worked for me but I recieved a HTML response instead of a XML one which is what I need for my app.
How to consume SOAP web service in SENCHA TOUCH?
This is my request to my server... I know I should be doing a POST action as this guy was told, but I still get a root node error.
Is this the proper way to consume a WebService, or there is another way to consume in Sencha using data models and stores? I have already saw an example using CFC but I am using IIS 7.5
POST /url/mobilews.asmx HTTP/1.1
Host: 10.0.1.182
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://tempuri.org/HelloWorld"
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<HelloWorld xmlns="http://tempuri.org/" />
</soap:Body>
</soap:Envelope>
Ext.Ajax.request({
method: 'GET',
url: 'http://url/mobileservice/mobilews.asmx?op=HelloWorld',
params: { method: 'HelloWorld', format: 'json' },
success: function (response, request) {
alert('Working!');
alert(response.responseText);
},
failure: function (response, request) {
alert('Not working!');
}
});
Here goes the error message:
<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><soap:Fault><soap:Code><soap:Value>soap:Receiver</soap:Value></soap:Code><soap:Reason><soap:Text xml:lang="en">System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Xml.XmlException: Data at the root level is invalid. Line 1, position 1.