Download SSRS report as Excel File (AngularJs, C#, MVC)

I am working on a MVC project with AngularJs  and trying to download SSRS report as an excel. Am new to AngularJs.
I have tried the following codes and output is download excel with binary code!

Please correct my code, so that will download excel in exact same format as in SSRS report.

report-list.ctrl.js

(function () {
    'use strict';
    var module = angular.module('app')

        //.directive('ngConfirmClick', [
        //    function () {
        //        return {
        //            link: function (scope, element, attr) {
        //                var msg = attr.ngConfirmClick || "Are you sure?";
        //                var clickAction = attr.confirmedClick;
        //                element.bind('click', function (event) {
        //                    if (window.confirm(msg)) {
        //                        scope.$eval(clickAction)
        //                    }
        //                });
        //            }
        //        };
        //    }])

        .controller('ReportListController', ['$scope', '$http', '$q', '$interval', '$location', '$window', '$modal', '$modalStack', 'toastr', 'dataService',
            function ($scope, $http, $q, $interval, $location, $window, $modal, $modalStack, toastr, dataService) {

                $scope.showreportlist = true;
                $scope.reports = [];
                $scope.clientsessionreportData = [];


                $scope.downloadReport = function (res) {

                    var file = new Blob([res],  {  type:  'application/excel'  });
                        var  fileName  =  'ClientSessionReport.xls';

                        if  ($window.navigator  &&  $window.navigator.msSaveOrOpenBlob)  {
                                $window.navigator.msSaveOrOpenBlob(file,  fileName);
                        }  else  {
                                var  a  =  document.createElement('a');
                                a.href  =  URL.createObjectURL(file);
                                a.target  =  '_blank';
                                a.download  =  fileName;
                                document.body.appendChild(a);
                                a.click();
                        }
                } 


                $scope.getClientSessionReport = function (entity) {
                    $http({
                        method: 'GET',
                        url: absolutePath + 'api/Report/GetClientSessionReport?reportId=67',
                        data: {  }
                    }).success(function (data, status, headers, config) {
                        if (data.Status == 'Custom Error') {
                            alert(data.Message);
                        }
                        else if (data.Status == 'Error') {
                            alert(data.Message);
                        }
                        else {
                            $scope.downloadReport(data.Data)
                        }
                    }.bind(this)).error(function (data, status, headers, config) {
                        if (data.Status == 'Custom Error') {
                            alert(data.Message);
                        }
                        else {
                            alert('Unexpected Error while saving data!!');
                        }
                    });

                };

                $scope.getReports = function () {
                    $http({
                        method: 'GET',
                        url: absolutePath + 'api/Report/GetReports',
                        data: {}

                    }).success(function (data, status, headers, config) {
                        if (data.Status == 'Custom Error') {
                            alert(data.Message);
                        }
                        else if (data.Status == 'Error') {
                            alert(data.Message);
                        }
                        else {
                            jQuery.each(data.Data, function (index, item) {
                                $scope.reports.push({ "Name": item.ReportName });
                            });
                        }
                    }.bind(this)).error(function (data, status, headers, config) {
                        if (data.Status == 'Custom Error') {
                            alert(data.Message);
                        }
                        else {
                            alert('Unexpected Error while saving data!!');
                        }
                    });

                };

                $scope.getReports();


                $scope.gridOpts = {
                    showFooter: true,
                    enableSorting: false,
                    multiSelect: false,
                    enableFiltering: false,
                    enableCellEdit: false,
                    enableRowSelection: false,
                    enableSelectAll: false,
                    enableRowHeaderSelection: false,
                    selectionRowHeaderWidth: 35,
                    noUnselect: true,
                    enableGridMenu: false,
                    paginationPageSizes: [5, 10, 15],
                    paginationPageSize: 9,
                    "enablePagination": true,
                    "enablePaginationControls": true,

                    appScopeProvider: $scope.myAppScopeProvider,

                    columnDefs: [
                        {
                            field: 'Name',
                            enableCellEdit: false,
                            displayName: 'Report Name'
                        },
                        {
                            name: 'actions',
                            enableSorting: false,
                            enableFiltering: false,
                            displayName: 'Actions',
                            width: '10%',
                            align: 'center',
                            cellTemplate: '<button id="downloadBtn" type="button" class="btn btn-small btn-primary" confirmed-click="grid.appScope.getClientSessionReport(row.entity)" ng-confirm-click="Are you sure to start download the selected report ?"  >Download</button>'
                        },
                    ]
                };

                $scope.gridOpts.data = $scope.reports;
            }]


        )
})();

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ReportController.cs

[Route("api/Report/GetClientSessionReport")]
        public ReportDTO GetClientSessionReport(long reportId)
        {
            var result = new ReportDTO();
            //HttpResponseMessage response;
            try
            {
                result.Data = _reportService.GetClientSessionReport(reportId);
                result.Status = "Success";
            }
            catch (TIEOException ve)
            {
                result.Status = "Custom Error";
                result.Message = ve.Message;
            }
            catch (Exception ex)
            {
                result.Status = "Error";
                result.Message = ex.ToString();
            }
            return result;
        }

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ReportService.cs

public byte[] GetClientSessionReport(long reportId)
        {
            var credentials = new System.Net.NetworkCredential(ConfigurationManager.AppSettings["ReportUserName"], ConfigurationManager.AppSettings["ReportPassword"]);

            using (var handler = new HttpClientHandler { Credentials = credentials })
            {
                using (var client = new HttpClient(handler))
                {
                    string url = HttpUtility.HtmlDecode(ConfigurationManager.AppSettings["ReportUrl"]);
                    url = url.Replace("{sesionId}", reportId.ToString());

                    string dbName = HttpUtility.HtmlDecode(ConfigurationManager.AppSettings["SessionDatabaseInstanceName"]);
                    url = url.Replace("{DBName}", dbName.ToString());

                    var response = client.GetStreamAsync(url);
                    response.Wait();
                    using (MemoryStream ms = new MemoryStream())
                    {
                        response.Result.CopyTo(ms);
                        return ms.ToArray();
                    }
                }
            }
        }

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Downloaded excel contains the byte array data as it is. Not got converted to SSRS report's view