Answered Cross-origin request via MODExt api

<script type="text/javascript">
Ext.onReady(function(){
	Ext.util.JSONP.request({
            url: 'http://api.openweathermap.org/data/2.5/weather?q=London,uk&callback=',
            callbackKey: "callback",
	    scope: this,
            callback: function(c) {    
            console.log("ok");
// got an error :: Uncaught TypeError: Cannot read property 'request' of undefined
            }
        })	
});
</script>