src/Backend/DiunaBI.UI.Shared/Extensions/ServiceCollectionExtensions.cs

@@ -8,12 +8,14 @@ public static class ServiceCollectionExtensions
     public static IServiceCollection AddSharedServices(this IServiceCollection services, string apiBaseUrl)
     {
         // HttpClient for API calls
-        services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(apiBaseUrl) });
-        
+        // Ensure BaseAddress ends with / for proper relative URL resolution
+        var baseUri = apiBaseUrl.EndsWith('/') ? apiBaseUrl : apiBaseUrl + "/";
+        services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(baseUri) });
+
         // Services
         services.AddScoped<AuthService>();
         services.AddScoped<LayerService>();
-        
+
         return services;
     }
 }

src/Backend/DiunaBI.UI.Web/Program.cs

@@ -10,12 +10,10 @@ builder.Services.AddRazorComponents()
     .AddInteractiveServerComponents();
 builder.Services.AddMudServices();
 
-var apiBaseUrl = builder.Configuration["ApiSettings:BaseUrl"] 
+var apiBaseUrl = builder.Configuration["ApiSettings:BaseUrl"]
                  ?? throw new InvalidOperationException("ApiSettings:BaseUrl is not configured");
 builder.Services.AddSharedServices(apiBaseUrl);
 
-builder.Services.AddScoped<AuthService>();
-
 var app = builder.Build();
 
 if (!app.Environment.IsDevelopment())