I'm writing a sencha touch app using sencha architect. Because my app do lot of ajax request, most of it need to send 'token' in request header for authentication. So I think of create child class base on Ext.Ajax which always has 'token' in request header. Then I can use this child class without care of the header.

```
MyApp.override.Ajax.request({ ... })

```

I try define this in app/override/Ajax.js

```
Ext.define('Myapp.override.Ajax', {
  override: 'Ext.Ajax',
  headers: {
      'token': 'test'
  }
});

```

I also set this as 'requires' in Application. But get error when try to call 

```
Myapp.override.Ajax.request({ ... })

```

Seem Myapp can not locate .override package (MyApp.override is undifined)

How to let MyApp know override package or what is the correct/best way to do this.

A quick example is very appreciated. Thank you very much.

Update info:

override file location: app\override\Ajax.js

html file:

```
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script>
    var Ext = Ext || {};
    Ext.theme = {
        name: "Default"
    };
</script>
<script src="sencha-touch-all-debug.js"></script>
<link rel="stylesheet" href="resources/css/sencha-touch.css">
<script src="app/override/Ajax.js"></script>
<script type="text/javascript" src="app.js"></script>
</head>
<body></body>
</html>

```

app.js file

```
Ext.Loader.setConfig({

});

Ext.application({

requires: [
    'MyApp.override.Ajax'
],
views: [
    'ContactDetailView'
],
name: 'MyApp'
...

```

App can start without error, but when call MyApp.override.Ajax.request : Cannot read property 'Ajax' of undefined , mean MyApp.override is undefined 

**Update**

Here something news, it better but not working yet.

```
Ext.define('MyApp.Ajax', {
extend: 'Ext.data.Connection',
singleton: true,

request: function( options ) {
    this.constructor(options, options.url);
console.log(options);
    options.header = {'Token':'mytoken'};
    this.callParent( options );
}
});

```

and error when try MyApp.Ajax.request() . I'm sure that options.url is exist in options by check the log

```
[ERROR][Ext.data.Connection#request] No URL specified 

```

I add extend from constructor function

```
constructor : function (config, url)
{
    config = config || {};
//config.url = 'google.com';
    this.initConfig(config);
    this.callParent(config);
},

```

Error just disappear when I remove comment from config.url = 'google.com'; but it comes that the config.url there is ajax request url but local file url ??? I see from chrome console and network ?

```
GET file:///C:/MyApp/assets/www/google.com?_dc=1370855149720  

```

Please help. thanks.