use a class to take optional parameters.

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/WebAssembly/CookieOptions.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace Volo.Abp.AspNetCore.Components.WebAssembly
+{
+    public class CookieOptions
+    {
+        public DateTimeOffset? ExpireDate { get; set; }
+        public string Path { get; set; }
+        public bool Secure { get; set; }
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/WebAssembly/CookieService.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Threading.Tasks;
-using System.Threading.Tasks;
 using Microsoft.JSInterop;
 using Volo.Abp.DependencyInjection;
 
@@ -15,9 +14,9 @@ namespace Volo.Abp.AspNetCore.Components.WebAssembly
             JsRuntime = jsRuntime;
         }
 
-        public async ValueTask SetAsync(string key, string value, DateTimeOffset? expireDate = null, string path = null)
+        public async ValueTask SetAsync(string key, string value, CookieOptions options)
         {
-            await JsRuntime.InvokeVoidAsync("abp.utils.setCookieValue", key, value, expireDate?.ToString("r"), path);
+            await JsRuntime.InvokeVoidAsync("abp.utils.setCookieValue", key, value, options?.ExpireDate?.ToString("r"), options?.Path, options?.Secure);
         }
 
         public async ValueTask<string> GetAsync(string key)

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/WebAssembly/ICookieService.cs

@@ -5,7 +5,7 @@ namespace Volo.Abp.AspNetCore.Components.WebAssembly
 {
     public interface ICookieService
     {
-        public ValueTask SetAsync(string key, string value, DateTimeOffset? expireDate = null, string path = null);
+        public ValueTask SetAsync(string key, string value, CookieOptions options = null);
         public ValueTask<string> GetAsync(string key);
         public ValueTask DeleteAsync(string key, string path = null);
     }

templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor/wwwroot/libs/abp/core/abp.js

@@ -1,4 +1,14 @@
-window.abp.utils.setCookieValue = function (key, value, expireDate, path) {
+/**
+     * Sets a cookie value for given key.
+     * This is a simple implementation created to be used by ABP.
+     * Please use a complete cookie library if you need.
+     * @param {string} key
+     * @param {string} value
+     * @param {string} expireDate (optional). If not specified the cookie will expire at the end of session.
+     * @param {string} path (optional)
+     * @param {bool} secure (optional)
+     */
+window.abp.utils.setCookieValue = function (key, value, expireDate, path, secure) {
     var cookieValue = encodeURIComponent(key) + '=';
     if (value) {
         cookieValue = cookieValue + encodeURIComponent(value);
@@ -12,6 +22,10 @@
         cookieValue = cookieValue + "; path=" + path;
     }
 
+    if (secure) {
+        cookieValue = cookieValue + "; secure";
+    }
+
     document.cookie = cookieValue;
 };