How to solve 401 (unauthorized) exception

how to solve 401 (Unauthorized) exception while calling APi controller from Ajax call in data table in mvc

function QAReport() {
       $("#QaReport_values").dataTable({
           "processing": true,
           "serverSide": false,
           "destroy": true,
           "iDisplayLength": 50,
           "order": [0, 'desc'],
           "ajax": {
               "url": '@AppConstants.ApiUrl' + 'ProductivityDashboard/ProductivityDashboardApi/QAReport',
               "type": 'GET',
               "data": {},
               "dataType": 'json',
               "dataSrc": ''
           },
           "columns": [
           { "data": "DeveloperName" },
           { "data": "ProjectName" },
           { "data": "Goal" },
           { "data": "UserStory" },
           { "data": "DeployedDateTime" },
           ],
           "language": {
               "emptyTable": "There are no data at present."
           },
           "responsive": true
       });
   }