unable to fetch json data from $http post method in angularjs

Question

I am unable to fetch json data from $http post method in angularjs I had try following code in my controller file

var sectionTypeVM = new Object();
            sectionTypeVM.sessionid = 'Session';
            sectionTypeVM.query = 'where LOB group by Report_Source_Type,Report_Object_Type';
           // alert(JSON.stringify(sectionTypeVM));
            $http({
                method: 'post',
                url: 'http://testserver/search',
                dataType: 'json',
                data: JSON.stringify(sectionTypeVM),
                headers: { 'Content-Type': 'application/json' }
            }).success(function(data, status, headers, config) {
                alert('success');
                alert(data);
                })
            .error(function(data, status, headers, config) {
                alert('error');
                  alert(data+ status + headers + config );
            });

My $http request return error function when called. I am using AngularJS v1.2.16

Thanks Gajanan