Use ServerCertificateCustomValidationCallback

8.0/WebServices/TodoREST/TodoREST/MauiProgram.cs

@@ -16,7 +16,6 @@ public static MauiApp CreateMauiApp()
 				fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
 			});
 
-		builder.Services.AddSingleton<IHttpsClientHandlerService, HttpsClientHandlerService>();
 		builder.Services.AddSingleton<IRestService, RestService>();
 		builder.Services.AddSingleton<ITodoService, TodoService>();
 

8.0/WebServices/TodoREST/TodoREST/Services/RestService.cs

@@ -9,19 +9,14 @@ public class RestService : IRestService
     {
         HttpClient _client;
         JsonSerializerOptions _serializerOptions;
-        IHttpsClientHandlerService _httpsClientHandlerService;
 
         public List<TodoItem> Items { get; private set; }
 
-        public RestService(IHttpsClientHandlerService service)
+        public RestService()
         {
 #if DEBUG
-            _httpsClientHandlerService = service;
-            HttpMessageHandler handler = _httpsClientHandlerService.GetPlatformMessageHandler();
-            if (handler != null)
-                _client = new HttpClient(handler);
-            else
-                _client = new HttpClient();
+            HttpClientHandler insecureHandler = GetInsecureHandler();
+            _client = new HttpClient(insecureHandler);
 #else
             _client = new HttpClient();
 #endif
@@ -32,6 +27,18 @@ public RestService(IHttpsClientHandlerService service)
             };
         }
 
+        private HttpClientHandler GetInsecureHandler()
+        {
+            HttpClientHandler handler = new HttpClientHandler();
+            handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) =>
+            {
+                if (cert != null && cert.Issuer.Equals("CN=localhost"))
+                    return true;
+                return errors == System.Net.Security.SslPolicyErrors.None;
+            };
+            return handler;
+        }
+
         public async Task<List<TodoItem>> RefreshDataAsync()
         {
             Items = new List<TodoItem>();