consuming a WCF RESTFUL web service with sencha touch 1

[zied]

SALAM all.
i'm doing a cross mobile app using sencha touch 1 and i want to consume a RESTFUL web service that i made it with WCF.
the link ti my web service is "localhost: 8732/log/log/admin/pass/admin" and in my sencha touch 1 app, i add this code

Ext.Ajax.request({
   url: 'http://localhost:8732/log/log/admin/pass/admin',
  success : function(response, opts) {
      var obj = eval('('+ response.responseText+ ')');
      Ext.Msg.alert("Bienvenue ",obj);
     alert("entre dans la fonction succe");
   },
  failure: function(response, opts) {
      Ext.Msg.alert("error ",response.status); 
 }
 });
 

but only the failure function work, i can't retreive the expected data.
how can i fix it.
thank you