It works: client service + server service + utility service to know server uri when app is running

App.Services/AuthService/AuthService.cs

@@ -0,0 +1,40 @@
+using Microsoft.AspNetCore.Components.Authorization;
+using Sandbox.Models.ViewModels;
+
+namespace Sandbox.App.Services.AuthService;
+
+public class AuthService : IAuthService
+{
+    private readonly HttpClient _http;
+    //private readonly AuthenticationStateProvider _authenticationStateProvider;
+
+    // public AuthService(HttpClient httpClient, AuthenticationStateProvider authenticationStateProvider)
+    public AuthService(HttpClient httpClient)
+    {
+        _http = httpClient;
+        //_authenticationStateProvider = authenticationStateProvider;
+    }
+
+    public async Task<ServiceResponse<int>> Register(UserRegister request)
+    {
+        var result = await _http.PostAsJsonAsync("api/auth/register", request);
+        return await result.Content.ReadFromJsonAsync<ServiceResponse<int>>();
+    }
+
+    // public async Task<ServiceResponse<string>> Login(UserLogin request)
+    // {
+    //     var result = await _http.PostAsJsonAsync("api/auth/login", request);
+    //     return await result.Content.ReadFromJsonAsync<ServiceResponse<string>>();
+    // }
+    //
+    // public async Task<ServiceResponse<bool>> ChangePassword(UserChangePassword request)
+    // {
+    //     var result = await _http.PostAsJsonAsync("api/auth/change-password", request.Password);
+    //     return await result.Content.ReadFromJsonAsync<ServiceResponse<bool>>();
+    // }
+
+    // public async Task<bool> IsUserAuthenticated()
+    // {
+    //     return (await _authenticationStateProvider.GetAuthenticationStateAsync()).User.Identity.IsAuthenticated;
+    // }
+}

App.Services/AuthService/IAuthService.cs

@@ -0,0 +1,11 @@
+using Sandbox.Models.ViewModels;
+
+namespace Sandbox.App.Services.AuthService;
+
+public interface IAuthService
+{
+    Task<ServiceResponse<int>> Register(UserRegister request);
+    // Task<ServiceResponse<string>> Login(UserLogin request);
+    // Task<ServiceResponse<bool>> ChangePassword(UserChangePassword request);
+    // Task<bool> IsUserAuthenticated();
+}