.ajax to call rest web service

.ajax to call rest web service

Here is my code, however it always call error function

 $.ajax({  
           url:             "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Population_World/MapServer",            type: "GET",  
           error: function(e){  
             console.log("error call"+e);
           } ,
           success: function(resp){  
             console.log("success")  ;
           } 
         });

can anybody tell me what is wrong in this code? Thanks