unify url handling for routes and redirect

src/Routing/Route.php

@@ -53,7 +53,7 @@ class Route
 
         $query = count($queryParams) > 0 ? '?' . http_build_query($queryParams) : '';
 
-        return implode('/', $link) . $query;
+        return '/' . implode('/', $link) . $query;
     }
 
     public function testAgainst(array $path): ?array