Hello. I'd like to ask how to request CF API using AJAX. Here is my code :

$.ajax({
       type : "GET" , 
       url : "http://codeforces.com/api/problemset.problems?tags=implementation",
       success : function(data) {
           alert("success");
       } , 
       error : function(data) {
           alert('fail');
       }
});

The AJAX call returns nothing. How do I solve this issue? Thanks!