diff --git a/docker-compose-dev.yml b/docker-compose-dev.yml
index 7086de0..e4b4eca 100755
--- a/docker-compose-dev.yml
+++ b/docker-compose-dev.yml
@@ -13,6 +13,6 @@ services:
       - ./logs:/srv/logs
 
     environment:
-      - URL=http://localhost:8080
+      - URL=http://localhostxxx:8080
     ports:
       - 8080:80
diff --git a/docker-compose.yml b/docker-compose.yml
index 20f88d8..853c461 100755
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,9 +1,10 @@
-version: '3.3'
 services:
   http2pic:
     image: gitea.haschek.at/haschek-solutions/http2pic:2
     restart: unless-stopped
-
+    volumes:
+      - ./cache:/srv/cache
+      - ./logs:/srv/logs
     environment:
       - URL=http://localhost:8080
     ports:
diff --git a/web/index.php b/web/index.php
index db303aa..ccb5ea1 100755
--- a/web/index.php
+++ b/web/index.php
@@ -30,7 +30,7 @@ switch ($url[0]) {
         }
         $ip = getUserIP();
 
-        $viewport = $_REQUEST['viewport'] ?? '1024x768';
+        $viewport = $_REQUEST['viewport'] ?: '1024x768';
         if (!preg_match('/^\d+x\d+$/', $viewport)) {
             header('HTTP/1.0 400 Bad Request');
             echo 'Invalid viewport format. Use WIDTHxHEIGHT (e.g., 1024x768)';
@@ -63,9 +63,11 @@ switch ($url[0]) {
                 $viewport = explode('x', $viewport);
                 $driver->manage()->window()->setSize(new \Facebook\WebDriver\WebDriverDimension($viewport[0], $viewport[1]));
             } else {
-                $driver->manage()->window()->setSize(new \Facebook\WebDriver\WebDriverDimension(1024, 768));
+                $viewport = [1024, 768];
+                $driver->manage()->window()->setSize(new \Facebook\WebDriver\WebDriverDimension($viewport[0], $viewport[1]));
             }
-            addToLog("$ip\tRequested $target with viewport " . implode('x', $viewport) . " and js " . ($js ? 'enabled' : 'disabled'));
+            $viewportLabel = is_array($viewport) ? implode('x', $viewport) : (string) $viewport;
+            addToLog("$ip\tRequested $target with viewport " . $viewportLabel . " and js " . ($js ? 'enabled' : 'disabled'));
         } catch (Exception $e) {
             header('HTTP/1.0 500 Internal Server Error');
             addToLog("$ip\tRequested $target but resulted in error:\t" . $e->getMessage());