Use absolute URLs everywhere, this should fix #3

controllers/BaseController.php

@@ -9,8 +9,6 @@ use \Grocy\Services\LocalizationService;
 class BaseController
 {
 	public function __construct(\Slim\Container $container) {
-		$this->AppContainer = $container;
-
 		$databaseService = new DatabaseService();
 		$this->Database = $databaseService->GetDbConnection();
 
@@ -23,6 +21,12 @@ class BaseController
 		{
 			return $localizationService->Localize($text, ...$placeholderValues);
 		});
+		$container->view->set('U', function($relativePath) use($container)
+		{
+			return $container->UrlManager->ConstructUrl($relativePath);
+		});
+
+		$this->AppContainer = $container;
 	}
 
 	protected $AppContainer;

controllers/LoginController.php

@@ -27,16 +27,16 @@ class LoginController extends BaseController
 				$sessionKey = $this->SessionService->CreateSession();
 				setcookie('grocy_session', $sessionKey, time() + 31536000); // Cookie expires in 1 year, but session validity is up to SessionService
 
-				return $response->withRedirect('/');
+				return $response->withRedirect($this->AppContainer->UrlManager->ConstructUrl('/'));
 			}
 			else
 			{
-				return $response->withRedirect('/login?invalid=true');
+				return $response->withRedirect($this->AppContainer->UrlManager->ConstructUrl('/login?invalid=true'));
 			}
 		}
 		else
 		{
-			return $response->withRedirect('/login?invalid=true');
+			return $response->withRedirect($this->AppContainer->UrlManager->ConstructUrl('/login?invalid=true'));
 		}
 	}
 
@@ -48,7 +48,7 @@ class LoginController extends BaseController
 	public function Logout(\Slim\Http\Request $request, \Slim\Http\Response $response, array $args)
 	{
 		$this->SessionService->RemoveSession($_COOKIE['grocy_session']);
-		return $response->withRedirect('/');
+		return $response->withRedirect($this->AppContainer->UrlManager->ConstructUrl('/'));
 	}
 
 	public function Root(\Slim\Http\Request $request, \Slim\Http\Response $response, array $args)
@@ -64,6 +64,6 @@ class LoginController extends BaseController
 			$demoDataGeneratorService->PopulateDemoData();
 		}
 
-		return $response->withRedirect('/stockoverview');
+		return $response->withRedirect($this->AppContainer->UrlManager->ConstructUrl('/stockoverview'));
 	}
 }